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dust grains in the interstellar medium (ism) can align with the magnetic fields, which in turn can cause the light from background stars to become polarized. by understanding the physics behind how grains align with magnetic fields, we can better understand many astrophysical processes. it is believed that the mineralo... | grain alignment and polarization in the envelope of ik tau |
polycyclic aromatic hydrocarbons (pah) are ubiquitous organic molecules populating the interstellar medium of galaxies and they are the major responsible of interstellar infrared spectral features (e.g., allamandola et al. 1989, tielens 2008). pah are also found as constituents in carbonaceous chondrites (e.g., kalpana... | laboratory simulation of space weathering of nano-aggregates of polycyclic aromatic hydrocarbons dispersed in the water environment |
although it is known that the dust grains in the ism align with magnetic fields, the alignment physics of these particles is still somewhat unclear. utilizing direct observational data and radiative alignment torque (rat) theory, further constraints can be put onto this alignment. due to the physics of this alignment, ... | understating polarization in the interstellar medium through the theory of radiative torque alignment |
interstellar dust grain alignment gives rise to polarization from uv to mm wavelengths, allowing the study of the geometry and strength of the magnetic field. over the last couple of decades observations and theory have led to the establishment of the radiative alignment torque (rat) mechanism as the leading candidate ... | dust grain alignment in ic 63 - h2 formation enhancement and collisional disalignment |
interstellar dust is an important foreground for observations across a wide range of wavelengths. dust grains scatter and absorb uv, optical and near-infrared light. these processes heat dust grains, causing them to radiate in the far-infrared. as a tracer of mass in the interstellar medium, dust correlates strongly wi... | a new 3d map of milky way dust |
when a star with stellar wind moves through the interstellar medium (ism) at a relative supersonic velocity, an arch like structure known as a stellar wind bow shock is formed. studying the characteristics of these structures can further our understanding of evolved stellar winds and the composition of the ism. observa... | astronomy in denver: polarization of stellar wind bow shocks |
we present bvri polarimetric measurements of nine bright stars in a 15'-square region centered on stock 19. seven of them satisfy the serkowski equation for star light polarization due to interstellar dust. this allowed us to estimate the degree of maximum polarization (pmax) and the wavelength of maximum polarization ... | bvri polarization of stars in the direction of stock 19 |
faraday effect - a common and useful probe of cosmic magnetic fields - is the result of magnetically-induced birefringence in plasmas causing rotation of the polarization plane of a linearly polarized electromagnetic wave. classically, the rotation angle scales with the wavelength as δϕ =rmλ2 , where rm is the rotation... | evidence of high-frequency/small-scale turbulence in the cygnus region and anomalous faraday rotation |
in this paper, using the hydrodynamic model, the jeans gravitational instability in a dusty plasma with q-nonextensive velocity distributions is investigated. the change in the jeans instability criterion and growth rate due to the effects of the dust-ion collision, polarization force, and nonextensivity parameters are... | jeans gravitational instability in a collisional nonextensive dusty plasma with polarization force |
a ftir study on the radiation chemistry of isolated ethanol molecules in noble gas matrices at 4.4 k revealed the formation of a variety of products due to dehydrogenation as well as c–c and c–o bond cleavage, remarkably dependent on the matrix.ethanol (c2h5oh) is one of the most common alcohol molecules observed in va... | radiation-induced transformations of matrix-isolated ethanol molecules at cryogenic temperatures: an ftir study |
the globular cluster terzan 5 contains 38 pulsars, each of which has the potential to generate new knowledge about pulsar emission mechanisms, the interstellar medium, nuclear physics, gravitational waves, and many other fields of physics and astronomy. timing these pulsars is one of the first and most important steps ... | polarization calibration of millisecond pulsars in terzan5 |
the first polarization data from alma have been delivered, and are both expanding and confounding our understanding of the role of magnetic fields in low-mass star formation. here i will show the highest resolution and highest sensitivity polarization images ever made of a class 0 protostellar source. these new alma ob... | probing turbulent, magnetized star formation with alma observations and next-generation arepo simulations |
in this work, we have focused on microsolvation of isopropyl cyanide (i-prcn) as isopropyl cyanide has been recently detected in interstellar space and is of great importance from the astrochemical and bio-chemical point of view for its branching carbon chains. such branches are needed for many molecules crucial to lif... | microhydration effect on structural, energetic and light scattering properties of first branched interstellar molecule ( i-prcn) |
light from nearby stars becomes linearly polarized while traversing a dichroic interstellar medium. polarization data which reveal heliosphere features are summarized. polarizing dust grains trace a magnetic field direction consistent with the field affecting the warm breeze of secondary interstellar helium found by ib... | magnetically-aligned interstellar dust grains at the heliosphere |
we present new multi-wavelength polarization measurements of 20 stars in the direction of the open cluster ngc 1502. polarimetric results are combined with uvbyβ photometric data to obtain precise estimates of the total-to-selective extinction and distance for each star. ngc 1502 is located at the periphery of the cam ... | interstellar extinction toward the young open cluster ngc 1502 |
the interstellar medium (ism) mediates galactic evolution as the reservoir of material for future star formation and the repository of energy and matter output by stellar processes. it consists of matter (both gas and dust), magnetic fields, and relativistic particles in rough equipartition in energy density. understan... | canadian investigations of the interstellar medium |
in this note, i report a r-band polarimetric study on a massive star-forming region gl 437 (a.k.a. afgl 437) to infer the magnetic field (b-field) geometry of this region. the mean b-field in the diffused region, is found to be parallel to the extended cloud structure and the galactic plane. i compared present optical ... | magnetic fields in the massive star-forming region gl 437 |
we draw our targets from the mir objects in the wise catalog of anderson+, 2014, j/apjs/212/1. we also include in our sample sharpless h ii regions (sharpless 1959, vii/20). see section 2 for further details. our observations were made with the gbt 100m telescope from 2012 july through 2014 august. there are seven radi... | vizier online data catalog: radio observations of galactic wise hii regions (anderson+, 2015) |
the planck satellite has mapped the polarized microwave sky (from 30 ghz to 353 ghz) with unprecedented sensitivity and angular resolution. this wealth of data yields the first complete map of polarized thermal emission from dust in our own galaxy, shedding new light on the formation of dense cold structures within whi... | polarized thermal dust emission from planck, a comparison with mhd simulations and lessons from a fbm model |
the canadian galactic plane survey (cgps) is the largest effort of its kind to study and understand the galactic magnetic field (gmf) and interstellar medium (ism) in our galaxy (see e.g. taylor et al. 2003). the cgps has mapped the galactic plane visible from drao on all spatial scales down to arcminute resolution in ... | cgps studies of the galactic magnetic field |
the relation between the interstellar magnetic field (ismf) controlling the configuration of the "ribbon" of energetic neutral atoms discovered by ibex, and the ismf in deep space, can be probed with polarized starlight. starlight is polarized in a dichroic interstellar medium formed by interstellar dust grains that ar... | charting the interstellar magnetic field behind the interstellar boundary explorer (ibex) ribbon |
bok globules are small isolated dark cloud with a simple structure, when seen through optical wavelengths they looks like a dark patch surrounded by some bright foreground stars. because of their isolated location and simple structure, they are ideal laboratories, to study in detail the process of low-mass star formati... | photopolarimetric study of three selected bok globule (cb56, cb60 and cb69) |
the global sed of the milky way reaches a minimum at about 80 ghz. in the decade below this, three emission processes predominate: synchrotron, from cosmic ray leptons spiralling in the galactic magnetic field; free-free, from ionized gas in nebulae and the diffuse warm ionized medium; and anomalous microwaves (ame), b... | "untangling the centimetre-wavelength sky" |
in the last stages of their lives, sun-like stars evolve along the asymptotic giant branch (agb), and contribute a significant fraction of heavy elements to the interstellar medium, driving the chemical evolution of galaxies and providing the building material for new stars and planets. we observed the detached shells ... | probing the effects of stellar evolution: the dust and gas in detached shells around agb stars |
table 1 lists the 9 emir multiline probe of the ism regulating galaxy evolution (empire; pi: f. bigiel) targets. all targets are nearby (d<=15mpc) face-on (i<=65°) spiral galaxies that are also large on the sky (>=2'). the observations for empire were carried out at the iram 30m telescope located at pico velet... | vizier online data catalog: empire: iram 30m dense gas survey (jimenez-donaire+, 2019) |
protoplanetary disks are thought to be magnetically active and could transport angular momentum via magneto-rotational instabilities and disk winds. these hypothesis have been the theoretical background in order to understand magnetic fields in disks via high-angular resolution (<100 au scales) and great sensitivity... | emisión (sub)milimétrica polarizada de discos protoplanetarios |
recent studies, that determined the inflow longitude of the local interstellar medium from the anisotropy of interstellar pickup ion (pui) radial velocity, have once again raised the question, how transport effects and especially wave activity in the solar wind modifies the velocity distribution function of puis.this s... | numerical study of alfvénic wave activity in the solar wind as a cause for pitch angle scattering with focus on kinetic processes |
the status of dib research has strongly advanced since 20 years [1], as well as the quest for fullerenes, pahs and large organics in space. in 1994 we reported the discovery of two near ir diffuse bands coincident with c60+, confirmed in subsequent years [2-6] and now by latest laboratory experiments. a number of dib o... | fullerenes, organics and the diffuse interstellar bands |
several black hole binaries (bhbs) present persistent soft gamma-ray emission (up to e ∼mev). although different models have been proposed to explain the origin of this component (non-thermal corona, relativistic jets), its nature still remains unknown. the detection of strong polarization at high-energies in the well-... | gamma-ray polarization in accreting black holes: the case of xte j1118+480 |
knowledge of temperature, densities, and chemical abundances of hot plasmas that exist in stars including the sun, in the interstellar and intergalactic medium, and in active galactic nuclei can be optimally determined through observations in key diagnostic spectral lines, many of which are in the far ultraviolet range... | coatings for improved far-uv astrophysics observations |
about 50 scientists belonging to the “friends of fors” family convened at the eso supernova planetarium & visitor centre to celebrate 20 years of successful science exploration with fors1 and fors2. scientific highlights from these instruments were discussed, covering various research areas rang-ing from interstell... | report on the eso event "20th anniversary of science exploration with fors" |
bvri polarization measurements of 14 selected young stars with circumstellar dust disks are presented. the interstellar polarization in the direction of these stars is not significant. the observed polarization data and its wavelength-dependence indicate that it is intrinsic, due to scattering by circumstellar, asymmet... | polarization measurements of selected young stars with circumstellar dusty disks |
the importance of cosmic rays and magnetic fields for the physics of the interstellar medium and the evolution of galaxies is demonstrated by a number of recent numerical simulations. here we present new observations of the cosmic ray electron transport as well as the magnetic field strength and structure in galactic h... | new constraints on cre transport into galactic halos from radio continuum observations |
extinction and polarization by interstellar dust taints astrophysical signals, frustrating precision measurement of cosmological standard candles, electromagnetic components of multimessenger transients, and cmb signals. understanding the origins of dust variations on small angular scales and along the line of sight in... | obtaining the uv reddening curve of extreme-rv highly polarizing dust irradiated by zeta ophiuchi |
we extracted faint radio emission from the optically identified snr g107.0+9.0 from published surveys at 22mhz and 408mhz and new observations at 1.4ghz and 4.8ghz. g107.0+9.0 is clearly visible on the effelsberg medium latitude survey (emls) 1.4-ghz maps (uyaniker et al., 1998a&as..132..401u, 1999a&as..138...3... | vizier online data catalog: supernova remnant g107.0+9.0 radio images (reich+, 2021) |
the multiphase nature of astrophysical environment and diversity of driving mechanisms give rise to spatial variation of turbulence properties. nevertheless, the employed model of magneto-hydrodynamic turbulence is often oversimplified being assumed to be only alfvenic due to a lack of observational evidence. here we r... | identification of magnetosonic modes in galactic turbulence |
understanding the formation and evolution of galaxies across cosmic time is a major goal of modern astronomy. our current observations of the early universe come mainly from the optical and near-infrared rest-frame wavelengths, which are mostly biased towards dust-unobscured systems. the advent of millimetre and submil... | distant, dusty star-forming galaxies |
though the source of fast radio bursts (frbs) is still unknown, magnetars are a compelling candidate for at least some of these bursts. since magnetars are generally very young neutron stars, they should be preferentially found in regions of recent or ongoing star formation. based on this, we have conducted a long high... | high frequency frb search in star forming galaxies |
to explain the transfer of energy surrounding supermassive black holes (smbh), most of the theoretical models, if not all, must incorporate magnetic fields (b-fields). as matter rotates and gets closer to the black hole, the outgoing radiation results in an extraction of energy from the smbh— matter rotating around a s... | on the origin of radio-loudness in active galactic nuclei using far-infrared polarimetric observations |
fits files of disk images in sphere/irdis (h-band) from the very large telescope. the stars are located at the mathematical centers of the arrays. the units are in counts per pixel for qphi data. (2 data files). | vizier online data catalog: fits images of v1247 ori (ren+, 2024) |
magnetic fields are ubiquitous in the universe and are one of the major components regulating the motion and evolution of interstellar medium. machine learning has gained increasing popularity among astronomers, allowing us to study magnetic fields in detail through gas morphology. we adopt the deep learning method cas... | application of convolutional neural networks to predict magnetic fields directions in turbulent clouds |
the polarization data were obtained with the robopol polarimeter mounted at the 1.3m telescope at the skinakas observatory in crete, greece. all observations were carried out in the r band. all measurements are included; even those with low signal to noise ratio in the degree of polarization. we carried out co (1-0) ob... | vizier online data catalog: hi-h2. exploring the role of magnetic field (skalidis+, 2022) |
an international group of scientists has tackled the task of mapping the interstellar magnetic field (ismf) surrounding the heliosphere [1]. starlight that is linearly polarized by foreground interstellar dust grains aligned with respect to the ismf provide the data for determining the ismf orientation. polarimeters mo... | interstellar magnetic field shaping the heliosphere |
pulsar astronomy arguably offers the most diverse range of scientific applications compared with any other sub-field of astronomy. despite pulsars being interesting in their own right, they serve as tools to study a rich breadth of astrophysical phenomena and fundamental physics ranging from the electron content and th... | gravitational dynamics of a relativistic binary pulsar and a probe of radio pulsar intermittency |
polarization due to aligned dust grains is a well-known tool for probing interstellar magnetic fields. the detailed physics of the grain alignment mechanism has, however, been poorly understood and it's only in the last decade that the promise of a quantitative, observationally supported, theory has emerged. a well-tes... | why are carbonaceous grains unaligned in the ism? - hawc+ polarimetry of irc+10216 |
we present the results of a full-polarization, spatially-resolved study of the jetted active galactic nucleus (agn) hosted by the nearby galaxy ngc 3665. by analyzing archival data from the very large array, we have identified an intriguing region of rapidly varying polarization angle and low polarized flux in the nucl... | faraday depolarization as an indicator of a jet-ism interaction in ngc 3665 |
the canadian hydrogen intensity mapping experiment (chime) is a new radio transit interferometer located at the dominion radio astrophysical observatory (drao) near penticton, bc canada. chime is designed to measure 21 cm emission from neutral hydrogen at redshift 0.8 < z < 2.5 to map baryon acoustic oscillations... | canadian hydrogen intensity mapping experiment (chime) update |
the recent planck results in polarization at sub-mm wavelengths allow us to gain insight into the galactic magnetic field topology, revealing its statistical correlation with matter, from the diffuse interstellar medium (ism), to molecular clouds (mcs) (planck intermediate results. xxxii, xxxiii, xxxv). this correlatio... | a challenge for probing the statistics of interstellar magnetic fields: beyond the planck resolution with herschel |
magnetic fields can have a significant effect on the formation and evolution of molecular clouds and the formation of stars. the presence of strong magnetic fields restricts the motion of gas along the magnetic field lines. therefore, it resists gravitational collapse, hinders mass accretion and suppresses fragmentatio... | magnetic fields and star formation |
we carried out co (1-0) observations toward the target cloud with the purple mountain observatory 13.7m telescope (pmo-13.7m). we used the heinrich hertz submillimeter telescope on mt. graham, arizona, to measure the j=2-1 transition of co toward the target cloud. we upload the position-position-velocity (ppv) data in ... | vizier online data catalog: polaris flare co enhancement by mhd waves (skalidis+, 2023) |
molecular hydrogen is the most abundant element in the universe, particularly in interstellar plasmas such as atmospheres of gas giant planets and stars. electron collision data for hydrogen is critical to interpreting the spectroscopy of interstellar objects, as well as being of applied value for modelling technologic... | electronic excitation of molecular hydrogen by low-energy electrons |
the planck satellite has mapped the polarized microwave sky (from 30 ghz to 353 ghz) with unprecedented sensitivity and angular resolution. this wealth of data yields the first complete map of polarized thermal emission from dust in our own galaxy, shedding new light on the formation of dense cold structures within whi... | polarized thermal dust emission as seen by planck : a comparison with mhd simulations and lessons from a toy model |
measurements of polarized thermal dust emission can be used to map magnetic fields in the interstellar medium. recently, blastpol, the balloon-borne large aperture submillimeter telescope for polarimetry, has published the most detailed map ever made of a giant molecular cloud forming high-mass stars. i will present an... | blast-tng: a next generation balloon-borne large aperture submillimeter polarimeter |
pilot is a balloon-borne astronomy experiment, designed to study the polarization of interstellar dust emission in our galaxy. the pilot instrument will allow simultaneous observations in two photometric channels at wavelengths 240 μm (1.2 thz) and 550 μm (545 ghz). the angular resolution is better than 3.5 arc minutes... | optical characteristics and performances of the pilot balloon-borne experiment |
alma polarization observations of g9.62+0.20, which is a massive star forming region presenting several cores at different evolutionary stages. i will show the relationship between the large-scale magnetic field probed by dust and the small- scale magnetic field already probed by masers, and the evolutionary difference... | the large-scale environment of the cluster forming filament g351.77-0.51 |
kepler orbits are usually associated with the motion of astronomical objects such as planets or comets. here we observe such orbits at the microscale in a system of charged, insulating grains. by letting the grains fall freely under vacuum, we eliminate the effects of air drag and gravity, and by imaging them with a co... | complex kepler orbits and particle aggregation in charged microscopic grains |
pilot (polarized instrument for long wavelength observations of the tenuous interstellar medium) is a balloonborne astronomy experiment designed to study the polarization of dust emission in the diffuse interstellar medium in our galaxy. the pilot instrument allows observations at wavelengths 240 μm and 550 μm with an ... | pilot optical alignment |
we present linear polarization towards the direction of the star cluster alessi 1, which is located in the anti-galactic centre direction. we have observed the cluster using aries imaging polarimeter (aimpol) as a back-end instrument at 104-cm sampuranand telescope, aries, nainital. the average degree of polarization t... | linear polarization towards galactic anticenter direction: the case of alessi |
the observations in the direction of the cir-mms cluster region (see cir-mmss 1-4 in reipurth+ 1996a&a...314..258r) were carried out using the sirpol imaging polarimeter mounted on the 1.4m infrared survey facility (irsf) telescope at the south african astronomical observatory (saao). our irsf/sirpol observations w... | vizier online data catalog: jhks polarimetry in circinus molecular cloud (kwon+, 2018) |
deep within giant molecular clouds, hidden by dense gas and dust, stars form. unprecedented data from the atacama large millimeter/submillimeter array (alma) reveal the intricate magnetic structureswoven throughout one of the most massive star-forming regions in the milky way.how stars are bornthe horsehead nebulasdens... | magnetic fields versus gravity |
observations of background stars of the book globules cb34, cb56 and [omk2002] 18 were performed in the near-ir with the instrument son of isaac (sofi) at the 3.58m new technology telescope (ntt) from november 11 to 15, 2015. stokes parameters q, u and i in the near-infrared wavelength range for background stars of the... | vizier online data catalog: stokes param. of bok globules background stars (jorquera+, 2018) |
i will review recent progress in our observational understanding of the link between the structure of molecular clouds and the formation of solar-type stars. in particular, i will describe the filamentary paradigm favored by herschel studies of the nearest molecular clouds of the galaxy which point to the key role of t... | interstellar filaments and star formation |
pulsar polarimetry is widely used to infer interstellar magnetic fields. these magnetic field estimates typically rely on the assumption that the observed polarisation rotation stems entirely from faraday rotation in the magneto-optic plasma found between the linearly polarized point source pulsar and our planet. yet, ... | mechanical faraday effect to inform on pulsar rotation direction |
dust thermal emissions observed with herschel have revealed that interstellar molecular clouds consist of many filaments. polarization observation of interstellar extinctions in the optical and near ir wavelengths shows that the dense filaments are extending perpendicular to the interstellar magnetic field. magnetohydr... | structures of magnetically-supported filaments and their appearance in the linear polarization |
pilot is a balloon borne experiment which aims at measuring precisely the polarized emission of the interstellar dust emission, in the submm range (240 and 550 μm). these measurements will be used to reach a better understanding of the galactic magnetic field role in the structure of the galaxy and the star formation p... | instrumental polarization modelling for the pilot submm experiment |
we make available 127 linear polarisation spectra of 101 stars, obtained with the fors2 instrument of the eso very large telescope. these spectra cover the wavelength range 380-950nm at a spectral resolving power of about 880. we have produced a catalogue with synthetic broadband polarimetry in the bvri filters, and we... | vizier online data catalog: southern hemisphere ism fors2 spectropolarimetry (bagnulo+, 2017) |
we present a new single-shot, full-stokes optical astro-polarimeter design using stress-engineered optics (seos). the seo is a cylindrical glass window under static stress by radially-inward forces in three symmetrically-space regions, producing spatially-varying birefringence throughout (spilman and brown, applied opt... | the first polarimeter in astronomy to use a stress-engineered optic (seo) |
magnetic fields play important roles in many astrophysical processes. however, there is no universal diagnostic for the magnetic fields in the interstellar medium (ism) and each magnetic tracer has its limitation. any new detection method is thus valuable. theoretical studies have shown that submillimeter fine-structur... | tracing magnetic fields with the polarization of submillimeter lines |
stellar wind bow shocks are structures created when stellar winds with supersonic relative velocities interact with the local interstellar medium (ism). they can be studied to understand the properties of stars as well as the ism. since bow shocks are asymmetric, light becomes polarized by scattering in the regions of ... | astronomy in denver: polarization of bow shock nebulae around massive stars |
linear polarimetry measurements were obtained in the nir h band (1.6 um) using the mimir instrument (clemens et al. 2007pasp..119.1385c) on the 1.8 m perkins telescope outside of flagstaff, az. mimir used a 10242 aladdin iii insb detector array, operated at 33.5 k. the instrument had a field of view (fov) of 10'x10' an... | vizier online data catalog: l204 - cloud 3 polarimetry and photometry (cashman+, 2014) |
pilot (polarized instrument for long wavelength observations of the tenuous interstellar medium) is a balloonborne astronomy experiment designed to study the polarization of dust emission in the diffuse interstellar medium in our galaxy. the pilot instrument allows observations at wavelengths 240 μm (1.2thz) with an an... | pilot optical alignment |
geomagnetic storms of the highest intensity are general driven by coronal mass ejections (cmes) impacting the earth's space environment. their intensity is driven by the speed, density, and, most-importantly, their magnetic-field orientation and magnitude of the incoming solar plasma. the most-significant magnetic-fiel... | observations and analyses of heliospheric faraday rotation of a coronal mass ejection (cme) using the low frequency array (lofar) and space-based imaging techniques |
sensitive, high resolution observations of galactic hi reveal an intricate network of slender linear features, much as sensitive surveys of dust in galactic molecular clouds reveal ubiquitous filamentary structure. across the high galactic latitude sky, diffuse hi structures are aligned with the interstellar magnetic f... | magnetically aligned hi and dust: new insights into the physical properties of the diffuse ism |
pulsar emission which we observe is fundamentally tied to the strong magnetic fields encasing the neutron star. charged particles follow these field lines before emitting curvature radiation. the projected polarization position angles of such radiation are a glimpse directly at the structure of these magnetic field lin... | one does not simply model radio polarization of pulsars (and connect it to data) |
little is known about biological radiation action on the molecular level. the response of isolated biomolecules upon energetic photons is of great interest i.e. for astrobiology and radiobiology. key questions concern ion chemistry in the interstellar medium, possible transport of biomolecules from space to earth and m... | dissociation of peptides by ions and photons |
cooling and trapping of polar molecules has attracted attention at cold and ultracold temperatures. extended study of molecular inelastic collision processes of polar interstellar species with proton finds an important astrophysical application to model interstellar medium. present study includes computation of rate co... | rotational quenching study in isovalent h+ + co and h+ + cs systems |
in our companion papers (hollick+ 2018apj...863...75h and 2018apj...863...76h) we analyze 637 intervals of magnetic wave activity observed by the voyager 1 and 2 spacecraft from its launch in 1977 through the end of 1990. we argue that these waves originate from cyclotron resonance with newborn interstellar pickup he+ ... | vizier online data catalog: magnetic wave activity observed by voyager 1 & 2 (hollick+, 2018) |
the planck satellite (planck 2015 results i) has mapped the polarized microwave sky (from 30 ghz to 353 ghz) with unprecedented sensitivity and angular resolution. this wealth of data yields the first complete map of polarized thermal emission from dust in our own galaxy (planck intermediate results xix),, shedding new... | polarized thermal dust emission as seen by planck : a comparison with mhd simulations and lessons from a toy model |
observations of faraday rotation (fr) can be used as a remote-sensing method of determining magnetic fields which has been well demonstrated through the corona, ionosphere, and interstellar medium. fr values are obtained via observations of polarised radio sources with well-documented characteristics (astronomical radi... | preliminary analysis of observations of heliospheric faraday rotation of a cme using lofar |
pilot is a stratospheric experiment designed to measure the polarization of dust fir emission, towards the diffuse interstellar medium. the first pilot flight was carried out from timmins in ontario-canada on september 20th 2015. the flight has been part of a launch campaign operated by the cnes, which has allowed to l... | inflight performance of the pilot balloon-borne experiment |
the remnants of core-collapse supernovae often present significant asymmetries while those of thermonuclear supernovae are, more or less, spherically symmetric. as superluminous supernovae (slsn) do not occur in milky way-type galaxies (they prefer metal-poor starburst dwarfs), our chances of studying directly a slsn r... | what do the remnants of superluminous supernovae look like? |
the linear polarization data used in this work are a combination of observations conducted at the cerro tololo interamerican observatory (ctio, chile), using the 0.9m telescope, and also at the observatorio pico dos dias/laboratorio nacional de astrofisica (opd/lna, brazil), using both the 0.6m and the 1.6m telescopes.... | vizier online data catalog: vri and h polarization toward sh 2-29 (santos+, 2014) |
measurements of optical circular polarization (stokes v) introduced by dust grains in the ism are important for two main reasons. first of all, the polarization itself contains information about the metallic versus dielectric composition of the dust grains themselves (h. c. van de hulst 1957, textbook). additionally, c... | astronomy in denver: probing interstellar circular polarization with polvis, a full stokes single shot polarimeter |
we seek to quantify the regions where dust grains are, and are not aligned by the local magnetic field in molecular cloud cores with embedded class 0 ysos . an understanding of where grains are aligned is crucial for any effort to compare models of magnetized core collapse with polarization vector maps. we propose to u... | grain alignment in class 0 ysos |
the robopol optical polarization data of the polaris flare were obtained with the robopol polarimeter at the 1.3m telescope at the skinakas observatory in crete, greece. observations cover the area l=[122.6deg, 126.0deg], b=[+24.7deg, +27.9deg] (almost 10 square degrees). all observations were in the r band. measuremen... | vizier online data catalog: optical polarization of the polaris flare (panopoulou+, 2015) |
faraday effect is a common and useful way to deduce cosmic magnetic fields in the interstellar and intracluster media (ism and icm). faraday rotation is the result of magnetically-induced birefringence in a dielectric medium causing a linearly polarized wave to suffer a rotation of its polarization axis as it traverses... | anomalous faraday rotation in the ism/icm |
blue luminescence (bl) in the emission spectra of the red rectangle centered on the bright star hd44179 is recently reported by vijh et al [1]. this results is consistent with the broad band polarization measurements obtained in 1980 by schmidt et al. both experimental and theoretical studies support that bl emission c... | laser induced emission spectroscopy of cold and isolated neutral pahs and panh: implications for the red rectangle emission |
this is an exciting time for the discovery of supernova remnants (snrs) in galaxies other than our milky way. snrs reflect a major process in the elemental enrichment of the interstellar medium (ism). the study of this interaction in different domains including radio, optical, ir and x-ray, allow a better understanding... | supernova remanents in the magellanic clouds: are there any surprises? |
massive stars strongly affect their surroundings through their energetic stellar winds and deaths as supernovae. the bow shock structures created by fast-moving massive stars contain important information about the winds and ultimate fates of these stars as well as their local interstellar medium (ism). since bow shock... | polarized bow shocks reveal features of the winds and environments of massive stars |
we explore the use of the recently introduced velocity gradient technique (see yuen & lazarian 2017 (2017apj...837l..24y) and lazarian et al. 2017 (arxiv:1703.03119)) to neutral and ionic species in two fluid mhd simulations representing the partially ionized interstellar medium. we use the fact that below the deco... | probing local decoupling scale using spectroscopic ion-neutral velocity gradients |
turbulence and magnetic fields are ubiquitous in the interstellar medium, shaping star formation and molecular cloud dynamics. as such, it is crucial to understand their effects. traditional techniques like dust polarization, however, are limited in their ability to probe high density or high opacity environments. to a... | the velocity gradient technique: a new way to map magnetic fields |
we measured the polarization of background stars toward the ic5146 filamentary cloud system with several instruments: the aryabhatta research institute of observational sciences (aries) imaging polarimeter (aimpol) and triple-range (g', r', i') imager and polarimeter (tripol; at the lulin observatory) provided optical ... | vizier online data catalog: polarimetry obs. toward ic5146 background stars (wang+, 2017) |
polarization is an under-exploited technique in the investigation of exoplanet atmospheres. a polarization detection, particularly if extended over a broad spectral range, can potentially set valuable constraints on the gas and clouds in an exoplanet atmosphere that is not possible through brightness-only observations.... | mapping exoplanet clouds with high-dispersion spectro-polarimetry |
ccd observations in the vilnius seven-color photometric system of two 13'x13' areas, centered on the nebulae ic59 and ic63, were obtained with the 1.8m vatican advanced technology telescope (vatt) telescope on mt.graham, arizona, using the sta0500a camera and a 4x4k ccd chip. observations in table 1 and 2. to cover all... | vizier online data catalog: vilnius photometry in ic 59 and ic 63 (soam+, 2021) |
understanding the underlying mechanisms of collisional processes between atoms and molecules is of fundamental importance for a large number of areas of research, including chemical reactivity, ultracold atoms and molecules, and astrophysics of the interstellar medium. in general, molecules are not spherically symmetri... | study of the effect of collisions on the rotational angular momentum of diatomic molecules with polarized light |
polarization dust emission, from non-spherical grains aligned with magnetic field lines, is a key tracer in the study of interstellar magnetic fields. however, interpreting polarization is a nontrivial task. polarization angles only provide a 2d picture of the 3d interstellar magnetic field structure, and the polarizat... | studying dust properties, grain alignment and magnetic field structure with multi-wavelength submillimeter polarization |
we observed 29 disks between november 27 and july 7, 2020, using vlt/sphere in the star-hopping mode in ksband with the infra-red dual-band imager and spectrograph (irdis). the data were obtained through six programs: 0103.c-0470, 105.209e, 105.20hv, 106.21hj, and 108.22ee (pi: m. benisty), and 105.20jb (pi: m. keppler... | vizier online data catalog: fits images of sphere protoplanetary disks (ren+, 2023) |
the observing strategy and data processing procedure for the full catalog are similar to that of paper i (wenger+ 2019apjs..240...24w). we used the atca c/x-band receiver and compact array broadband backend (cabb) to simultaneously observe 4-8ghz radio continuum emission and 20 hydrogen radio recombination line (rrl) t... | vizier online data catalog: southern hii region discovery survey. ii. full cat (wenger+, 2021) |
eta carinae, the brightest, massive binary in our galaxy, ejected prodigious amounts of material in two major eruptions in the 19th century. highly polarized starlight scatters off of the 10"x20" bipolar homunculus. extinction is very grey from the uv to deep red, indicating dust in the form of large grains. compositio... | what and where is the dust surrounding eta carinae? |
we present near-infrared polarimetric results for the n159/n160 star-forming complex in the large magellanic cloud with sirpol, the polarimeter of the infrared survey facility. we separated foreground sources using their visual extinction derived from near-infrared photometric data. the 45 young stellar candidates and ... | near-infrared polarimetric study of the n159/n160 star-forming complex in the large magellanic cloud |
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