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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 galactic magnetic field. within this data lie... | statistical properties of polarized dust emission : lessons from a model of the turbulent and magnetized interstellar medium |
we performed polarimetric observations of our sample during 2016, 2017, and 2018 with the robopol polarimeter, which is mounted on the 1.3m ritchey-chretien telescope at the skinakas observatory in crete, greece. the instrument is an imaging polarimeter, which uses two half-wave plates and two wollaston prisms to simul... | vizier online data catalog: r-band linear polarization of gaia stars (panopoulou+, 2019) |
polarisation properties of radio signals provide valuable information about the source, its surrounding region, and the interstellar medium. radio sources are often polarised, but the measurement is not a straightforward as it may seem. instrumental effects distort the observed signal – the feed, telescope structure, d... | point source c-band mueller matrices for the green bank telescope |
the study of polarization from the interstellar medium can provide insights into the properties of magnetic fields and other environmental characteristics of observed regions. we have used optical polarization of the dust in starless cloud l 183, and in the circumstellar envelope (cse) of the asymptotic giant branch (a... | spectro-polarimetry of grain alignment |
measuring precisely the faint polarization of the far-infrared and sub-millimetre sky is one of the next observational challenges of modern astronomy and cmb cosmology. i will describe the concept and science goals of the pilot balloon-borne instrument, dedicated to measuring the linear polarization of the faint inters... | in-flight performance of the pilot balloon-borne experiment |
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... | observational facts of extragalactic snrs |
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 |
the current paper makes use of data taken using sirpol, mounted on the infrared survey facility 1.4m telescope at the south african astronomical observatory, during the nights of 2013 july 7-9. the instrument performance, observational information, weather conditions, and data reduction process were previously describe... | vizier online data catalog: jhk polarimetry of stars behind bubble n4 (chen+, 2017) |
interstellar polarization is caused by elongated grains, aligned with the magnetic field, and can provide invaluable tools for probing magnetic fields, dust grains, and their environment, if the alignment physics can be fully understood. radiative alignment torque (rat) theory has now been refined to a predictive theor... | grain alignment and polarization hole in a starless core l183 |
the data cube of hi emission (spectral resolution of 0.2km/s) is retrieved from koch+ (2018mnras.479.2505k). this data cube is a combination of new interferometric observations from the karl g. jansky very large array (project id 14b-088) and archival single dish observations from the robert c. byrd green bank telescop... | vizier online data catalog: hi and co observations of m33 interstellar medium (utomo+, 2019) |
the tables 1, 2, 3, 6 are described in the source paper. the master table table1.dat contains the polarization and reddening data for 5910 stars, i.e. not only for 3871 stars used in the study but also for some stars with lower precision of the polarization data. the table1.dat can be used in further investigations. al... | vizier online data catalog: local bubble & gould belt polarization (gontcharov+, 2019) |
the faraday depth cube of the ic342 field in polarized intensity, produced from lofar hba observations as part of lofar proposal lc0_043. the cube is approximately 5x5 degrees in size, with 4-arcmin resolution, and covers faraday depths from -25 to +25rad/m2. the detailed specifications are given in the table and in th... | vizier online data catalog: faraday tomography of foreground towards ic342 (van eck+, 2017) |
we selected 27 radio continuum sources from the nvss survey (condon et al. 1998aj....115.1693c, cat. viii/65), located over an area of roughly 500 deg2 centered on perseus with flux densities at 1.4 ghz greater than 0.8 jy. the observations were conducted with the arecibo telescope. using the l-wide receiver, we simult... | vizier online data catalog: perseus cloud sources gaussian parameters (stanimirovic+, 2014) |
we have observed the cluster ngc1817 by using the aries imaging polarimeter (aimpol) on 2018 january 18, 19, and 22 in four passbands b, v, r, and i. the aimpol is mounted as a backend of the 104cm cassegrain telescope of aryabhatta research institute of observational sciences (aries). the exposure times were in the ra... | vizier online data catalog: polarization of 125 stars in ngc 1817 open cluster (singh+, 2020) |
we present multiple-epoch measurements of the size and surface brightness of the light echoes from supernova (sn) 2014j in the nearby starburst galaxy m82. hubble space telescope (hst) acs/wfc images were taken ∼277 and ∼416 days after b-band maximum in the filters f475w, f606w, and f775w. linear polarimetry of the sn ... | interstellar-medium mapping in m82 and circumstellar environment constraints through light echoes around supernova 2014j |
submillimeter polarimetry associated with grain alignment is accepted as one of the major avenues for detection of interstellar magnetic fields. the submm spectropolarimetry, on the other hand, is still unexplored beyond the molecular clouds. fine structure lines are polarized due to ground state alignment (gsa) by opt... | tracing magnetic field with polarimetry of submillimeter lines |
the atmosphere of venus is known to contain trace amounts of so, so_{2}, ocs, h_{2}so_{4}, and possibly h_{2}s and elemental sulfur oligomers, s_{n}. modeling studies indicate that many more compounds containing sulfur and both sulfur and chlorine may also be present, given that the known compounds are photolyzed by so... | ab initio characterization of sulfur compounds and their chemistry for venus and the interstellar medium |
hildebrand carved out a distinguished career across two disciplines: first in particle physics, and then in astrophysics, where he revolutionized the field of far-infrared astronomy and took the first measurements of the polarized emissions from interstellar dust. | obituary: roger hildebrand (1922-2021) |
the magnetic (b) field is ubiquitous throughout the milky way. several fundamental questions about the b-field in the cool, star-forming interstellar medium (ism) remain unanswered. in this dissertation, near-infrared (nir) polarimetric observations are used to study the large-scale galactic b-field in the cool ism in ... | magnetic fields in the perseus spiral arm and in infrared dark clouds |
diffuse interstellar bands (dibs) are the puzzling spectral features, originated in interstellar clouds, composed mostly of neutral hydrogen. the same clouds are the birthplaces of extinction and polarization. both these phenomena are believed to be caused by interstellar dust grains, oriented in the second case. despi... | diffuse interstellar bands |
we used the turpol instrument on the 2.5m nordic optical telescope (not) at roque de los muchachos observatory on la palma, during the nights of 2007 november 3-6, to perform broadband multicolor polarimetry of stars background to the taurus molecular cloud. see section 2.2. we performed spectropolarimetric observation... | vizier online data catalog: optical and nir polarimetry in taurus (vaillancourt+, 2020) |
for the first time spectropolarimetric observations of wolf-rayet star wr156 (wn8h) were conducted. medium resolution spectropolarimetric data in the range of 3500-7200 åå were obtained at russian 6-m telescope of special astrophysical observatory (sao ras). these data show that the light from the star is significantly... | spectropolarimetry and modeling of wr156 |
rotation measure (rm) cubes of the 3c196 field in polarized intensity (pi), stokes q and stokes u, synthesized from the low frequency array (lofar) high band antennas (hba) observation taken on 16 dec 2012 (observational id: l80508). the rm cubes cover a faraday depth range from -3rad/m2 to +8rad/m2 in 0.25rad/m2 steps... | vizier online data catalog: lofar-hba 3c196 field rm cubes (jelic+, 2015) |
we present a large-scale combination of near-infrared (near-ir) interstellar polarization data from background starlight, with polarized emission data at sub-millimetric (sub-mm) bands for the vela c molecular cloud. the sub-mm data were obtained by the balloon-borne large aperture submillimeter telescope for polarimet... | comparing submillimeter polarized emission with near-infrared polarization of background stars for the vela c molecular cloud |
interstellar matter in star forming regions appears to form filamentary structures, which were suggested to line up either parallel or perpendicular to the magnetic field. our purpose is to investigate this possible alignment further, based on a combined analysis of herschel and planck data obtained towards a large var... | methodology for a planck/herschel analysis of the interplay between filaments and magnetic fields in star forming regions |
observations of m101 and ngc 6946 were taken using the german receiver for astronomy at terahertz frequencies (great; and its improved successor upgreat) on board the stratospheric observatory for infrared astronomy (sofia) in cycles 2 and 4. the cycle 2 (pi: herrera-camus; project 02_0098) data used the original great... | vizier online data catalog: sofia cii and nii obs. of m101 and ngc6946 (tarantino+, 2021) |
recent numerical models of the multiphase ism underline the importance of cosmic rays and magnetic fields for the physics of the ism in disc galaxies. observations of properties of the ism in galactic halos constrain models of the expected exchange of matter between the star-forming disc and the environment (circumgala... | a fresh view of magnetic fields and cosmic ray electrons in halos of spiral galaxies |
blastpol observes the linearly polarized emission from interstellar dust. dust polarization traces magnetic fields, and submillimetre wavelengths can see into the dense molecular clouds in which stars are born. with this measurement, blastpol can help resolve long-standing questions about the role of magnetic fields in... | mapping submillimetre polarization with blastpol |
star formation is a fundamental process in the evolution of the cosmos. yet given the abundance of stellar constituents, it remains prescient as to why the number of stars is not correspondingly large. if we cannot satisfactorily explain how stars are formed, then many further avenues of research are hindered. this the... | methods and results toward measuring magnetic fields in star-forming regions |
cooling and trapping of polar molecules have stimulated research in precise monitoring and controlling dynamics in ultracold regime. there has been considerable interest in the study of molecular inelastic collision processes at cold and ultracold temperatures. collisional study of polar interstellar species co, adds a... | ultracold rotational quenching study of co with h+ |
using a fourier transform infrared spectrophotometer and a low temperature cryostat, we have obtained the ir spectra of formaldehyde dissolved in liquid krypton between 125 k and 137 k. monomeric formaldehyde in gas phase was prepared by thermal decomposition of para-formaldehyde. peak positions ($\nu$), wavenumber shi... | ir absorption and calculated frequencies of formaldehyde dissolved in liquid kr |
we have performed quantum mechanical calculations of cross-sections and rate coefficients for electron attachment to small, neutral, and positively charged grains. in addition to the polarization potential and - for charged grains - the coulomb potential, we considered the influence of the interaction between the charg... | electron attachment to interstellar grains |
multi-wavelength polarization measurements of stars in ngc 7380, centered on the emission nebula sh2-142 are presented. the polarization is found to be in the direction of the magnetic field of the galaxy for this region with the degree of polarization ranging from 1.8% to 3.3%. the wavelength of maximum polarization r... | interstellar extinction in the direction of ngc 7380 (sh2-142) |
what roles do interstellar magnetic fields play in star formation processes? we have studied the b-field of l1544, a dark cloud with a starless dense core showing active gas infall, and located only 140 pc away in taurus, via deep near-infrared (nir) imaging polarimetry with the mimir instrument. we find the b-field or... | the magnetic field of the l1544 starless dark cloud, traced using near-infrared background starlight |
the interstellar medium (ism) is a key part of our universe, affecting star formation, particle acceleration, and galaxy evolution. furthermore, magnetic fields play a critical role in the ism. it is therefore paramount to study magnetic fields and develop theoretical tools to characterize them. turbulence, like magnet... | magnetic fields as a source of anisotropy: mapping magnetic fields |
filamentary structures are ubiquitous in the interstellar medium (ism). this is particularly true in molecular clouds, with most clumps and cores forming inside the densest regions of filaments. both simulations and observations suggest that magnetic fields play a key role in the formation and evolution of filaments an... | statistical analysis of the relative orientations between filaments and magnetic fields in star forming regions |
the star-forming complexes in cygnus extend nearly 30 deg in galactic longitude and 20 deg in latitude, and most probably include star-formation sites located between 600 and 4000 pc. we combine the catalog by heiles (2000) with uvbyβ photometric data from the catalog of paunzen (2015) to collate a sample of o and b-ty... | study of the cygnus star-forming field |
magnetic regulation is an on-going research topic in star formation. on large scales the interstellar magnetic field can control the accumulation of gaseous material, affecting the rate at which new stars form. on small scales, the field can influence the formation of disks and control the flow of infalling material. d... | the twisted magnetic field in the protobinary l483 |
recent observations using the wind and ulysses spacecrafts and the solar occultation for ice experiment (sofie) during the period between 2007 and 2020 indicate a total cosmic dust influx at earth ranging from 22 to 32 tonnes per day. much is still unclear about the formation, evolution, and propagation of this cosmic ... | a novel methodology to estimate pre-atmospheric dynamical conditions of small meteoroids |
magnetism is one of the most important forces on interstellar gas dynamics, star formation, and galactic evolution. the next decade will transform our understanding of interstellar magnetism if we invest in polarimetry: surveys of polarized dust emission, starlight polarization, and single-dish measurements of zeeman s... | magnetic fields and polarization in the diffuse interstellar medium |
because of the extreme brightness of foreground emission relative to the desired signal, experiments seeking the 21 cm hi signal from the epoch of reionization must employ foreground removal or avoidance strategies with high dynamic range. almost all of these techniques rely on the spectral smoothness of the foreground... | eliminating polarized leakage as a systematic for 21 cm epoch of reionization experiments |
the observations of the 175 high-mass star-forming regions were performed in 2016 june, 2020 august and september, and 2021 april with the iram 30m telescope. the eight mixer receiver (emir) with dual polarization and the fourier transform spectrometer backend were used to cover the frequency ranges of 90.6-98.2ghz in ... | vizier online data catalog: iram 3mm, 2mm & 1.3mm obs. of star-forming regions (zhao+, 2023) |
we present commissioning results for the 0.7-4 ghz ultra-wideband receiver (uwbr) that has been built for the robert c. byrd green bank telescope (gbt). the primary science driver for the new receiver is improving sensitivity to nanohertz-frequency gravitational waves (as well as other areas of fundamental physics and ... | the green bank telescope 0.7-4 ghz ultra-wideband receiver |
the wave modes and the stability of a magnetized viscous self-gravitating plasma system with maxwellian distribution of ions and radiative effect of electrons, charge gradient force and polarization force is theoretically analysed. the investigation is carried out with a theoretical model dealing with ions, electrons a... | low frequency waves and instability in magnetized radiative dusty plasma |
the 870um (band 7) alma dust polarization observations of ser-emb 8 were taken on 2015 june 3 and 7 and have ~0.3" angular resolution. (2 data files). | vizier online data catalog: alma obs. of polarized dust emission from ser-emb 8 (hull+, 2017) |
the astronomical searches for ph2cn and ch3ph<sub spectral-line survey of sgr b2(n), conducted from 2002 september to 2013 march at the facilities of the arizona radio observatory (aro), covering the 1, 2, and 3 mm atmospheric windows (68-116, 130-172, and 210-280 ghz: d. t. halfen et al. 2014, in preparation). only... | vizier online data catalog: ph2cn/ch3ph2 rotational transition f |
this dissertation details the development of state-of-the-art hybrid atom-ion trapping architecture and technique towards increasing the quantum control of matter and the detection of chemical processes at cold temperatures. experimental work discussed herein is performed primarily using the second-generation of the mo... | action spectroscopy of molecular ions and studies of cold collsions in a hybrid atom-ion trap |
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 |
bow shocks around massive stars provide important information regarding the motion of the star, the stellar wind properties, and the density of the surrounding interstellar medium. we use a monte carlo radiative transfer code to investigate the polarization created when photons from a central star scatter from electron... | polarization signatures of bow shocks in stellar winds |
magnetic fields, while ubiquitous in many astrophysical environments, are challenging to measure observationally. based on the properties of anisotropy of eddies in magnetized turbulence, the velocity gradient technique is a method synergistic to dust polarimetry that is capable of tracing plane-of-the-sky magnetic fie... | surveying magnetic field morphology with velocity gradient techniques in interstellar clouds |
the interstellar detection of the straight-chain (n-propyl cyanide) and branched chain (i propyl cyanide) molecules towards the star-forming region, sgr b2(n2) enables the search for other complex organic molecules (coms). these molecules are precursors of biologically relevant prebiotic molecules. in this light, we co... | exploring the possibility of identifying 3-pyrroline in ism: a computational study |
the upcoming square kilometre array (ska) promises incredible advances across many areas of astrophysics: from the epoch of reionisation, galaxy evolution, and cosmology, to nearby galaxies, the milky way and the sun. in particular, the wide variety of observations (spectral, continuum, polarisation, multi-scale, wide-... | the galactic interstellar medium in the radio: prospects for the ska |
the far-uv wavelength range provides access to tracers of the interstellar medium (ism) in potentially all phases (neutral/ionized, atomic/molecular, dense/diffuse, hot/warm/cold). the combination of high spatial resolution and sensitivity enabled by the luvoir telescope, together with the high spectral resolution and ... | ism science with pollux |
identification of nucleobases in extraterrestrial carbonaceous chondrites implies their formation in an abiotic condition, and supports their prebiotic role in early earth. physicochemical processes by which these complex molecules are synthesized in icy grains are not well understood. the products of uv photo-irradiat... | biomolecule synthesis via uv-irradiation of their precursors in astrophysical ices: a quantum chemical perspective |
pilot is a balloon borne experiment, which will measure the polarized emission of dust grains, in the interstellar medium, in the sub millimeter range (with two photometric channels centered at 240 and 550 μm). the primary and secondary mirror must be positioned with accuracies better than 0.6 mm and 0.06°. these toler... | pilot, a balloon borne experiment underground tests |
we measured the polarisation of the eclipsing binary ah cep in 29 nights from november 2019 until february 2020 with wollaston-polarimeters. after removing the interstellar component, we were able to analyse the intrinsic polarisation of the star system. it varies between 0.1 % and 0.9% (v) at angles between 80-100 deg... | welchen zusammenhang gibt es bei dem bedeckungsveraenderlichen ah cep zwischen der lichtkurve und der variablen polarisation? |
nonspherical aligned dust grains produce strong linearly-polarized thermal emission at submm and microwave frequencies, with polarized fractions exceeding 20% in some parts of the high-latitude sky. observations of emission, absorption, and scattering by dust, together with our knowledge of the abundances of elements o... | models of polarized emission from interstellar dust grains |
the disk of our galaxy is filled with clouds of diffuse matter, modifying spectra of distant stars. these clouds are sources of extinction, polarization and of spectral features such as atomic and molecular lines as well as the diffuse interstellar bands (dibs), still of unknown origin, though likely molecular. apparen... | profiles of interstellar spectral features caused by physical parameters of clouds |
simulated cometary ice experiments have indicated that circularly polarised light could be the initial source of life's handedness. we detected chiral sugars, amino acids and their molecular precursors within these interstellar achiral ice analogues. | chiral sugar and amino acid formation in simulated cometary matter inches closer to explaining the emergence of homochiral life |
elongated dust grains in the interstellar medium polarize background starlight, and they align perpendicularly to the ambient magnetic field. by examining the polarization percentage and position angle of background starlight, it is possible to determine characteristics of the intervening dust such as grain size, orien... | optical polarimetry of highly polarizing dust toward ζ ophiuchi |
polarization of dust thermal emissions shows that the dense filaments are extending perpendicular to the interstellar magnetic field. magnetohydrostatic structures of such filaments are studied. the magnetically-supported maximum line mass increases in proportion to the magnetic flux per unit length threading the filam... | magnetohydrostatic structures of magnetically-supported filaments and their stability |
the spectropolarimetric data analyzed in this study were obtained by the university of wisconsin's hpol spectropolarimeter, mounted on the 0.9 m pine bluff observatory (pbo) telescope. data obtained before 1995 were recorded using a dual reticon array detector spanning the wavelength range of 3200-7600 å with a spectra... | vizier online data catalog: spectropolarimetric survey of classical be stars (draper+, 2014) |
interaction of electrons with cumulene carbenes (h2c2, h2c3, h2c4, h2c5, h2c6) and some of the possible outcomes are reported in this article. the prominent scattering channels like elastic, inelastic, ionization, and momentum transfer are examined through respective cross sections for these molecules and their polyace... | electron scattering and ionization of astrophysical molecules |
the sensitivity upgrades of both the nrao very large array (vla) and the nrao very long baseline array (vlba) have begun to provide us with a much improved perspective on stellar centimeter radio emission, particularly concerning young stellar objects (ysos) and ultracool dwarfs. i will mainly present a deep vla and vl... | the orion radio all-stars: extreme yso radio and x-ray variability |
evolved cool stars exhibit a massive mass loss, which contributes to the enrichment of the interstellar medium and therefore to the recycling of matter in the universe. the mechanisms (e.g. the stellar magnetic field) behind this mass loss phenomena are not understood, but can be constrained thanks to observations of t... | a magnetic field study in the envelope of cool evolved stars |
polarization of starlight can indirectly tell us many things about the universe around us. from identifying star nurseries to mapping galactic scale magnetic fields, the properties of polarized light allow astronomers to observe phenomena that would otherwise be very hard to observe. the wavelength dependence of visual... | probing the radiation field color towards (and beyond) per ob3 (richard spolizino, kristin kulas, b-g andersson, archana soam, ilija medan, andrew helton) |
interstellar dust grains are aligned with their physical and spin axes parallel to the ambient magnetic field. this fact is supported by polarization observations from ultraviolet to millimeter wavelengths. the radiative torque (rt) mechanism, by which the grains become aligned, has recently survived a number of specif... | a test of dust grain alignment via far-infrared polarization |
filaments are ubiquitous in the interstellar medium (ism), yet their formation and evolution remains the topic of intense debate. in order to obtain a more comprehensive view of the 3d morphology and evolution of the musca filament, we model the c18o(2-1) emission along the filament crest with several large-scale veloc... | on the 3d curvature and dynamics of the musca filament |
the role of the magnetic field in the formation of the filamentary structures observed in the interstellar medium (ism) is a debated topic. the planck all-sky maps of linearly polarized emission from dust at 353ghz provide the required combination of imaging and statistics to study the correlation between the structure... | the relative orientation between the magnetic field and structures traced by interstellar dust |
magnetic fields are expected to be a crucial component of interstellar dynamics, but are difficult to measure with accuracy and precision, especially at low gas densities. recently, atomic ground state alignment (gsa) has been proposed as a new technique for probing diffuse gas magnetic fields, and has been reported in... | a possible detection of [c ii] ground state alignment polarization |
the observations were carried out with the 22-m mopra radio telescope in november 2007. we used the dual 3-mm monolithic microwave integrated circuit (mmic) receiver connected to the 8-ghz spectrometer, which provided a velocity resolution of ~0.9 km/s at 90 ghz. spectra in two polarizations were observed simultaneousl... | vizier online data catalog: spectral line survey of two loss (armijos-abendano+, 2015) |
systematic enrichments of l-amino acids in meteorites is a strong indication that biological homochirality originated beyond earth. although still unresolved, stellar uv circularly polarized light (cpl) is the leading hypothesis to have caused the symmetry breaking in space. this involves the differential absorption of... | uncovering the chiral bias of meteoritic isovaline through asymmetric photochemistry |
continuum observations of {rho} oph-a at 850um were made by inserting pol-2 into the optical path of scuba-2 on the james clerk maxwell telescope (jcmt) between 2016 april 15 and 2016 april 24. the region was observed in 20 sets of 41 minutes observations. continuum polarimetric observations were simultaneously taken a... | vizier online data catalog: first-look analysis of {rho} oph-a at 850um (kwon+, 2018) |
through full-sky observations of the polarized intensity of galactic dust emission, the planck satellite has furnished important new constraints on the composition, size, and shape of interstellar grains. we present new models of interstellar dust consisting of silicate and carbonaceous components of spheroidal shape t... | a unified model of polarized extinction and emission from interstellar dust |
we live in a magnetic universe with magnetic fields spanning an enormous range of spatial and temporal scales. in particular, magnetic fields at the scale of a galaxy are known as galactic magnetic fields and are the focus of this phd thesis. these galactic magnetic fields are very important since they affect the dynam... | reconstructing magnetic fields of spiral galaxies from radiopolarimetric observations |
the infrared spectra of formaldehyde (h2co) dissolved in liquid krypton between 125 k and 137 k have been obtained using a fourier transform infrared spectrophotometer and a low temperature cryostat. backing pressures higher than 1.5 atm were necessary to liquefy kr above 120 k. monomeric formaldehyde in gas phase was ... | infrared bands of formaldehyde dissolved in liquid krypton at cryogenic temperatures and the vibrational modes ν1, ν2, and ν5 of h2co in comets and interstellar clouds |
from the molecular point of view, life is asymmetric. proteins are made up of amino acids with l-configuration whereas dna and rna are composed of ribose and 2-deoxyribose with d-configuration. we believe that the origin of this symmetry breaking can be key to understanding the origin of life. based on in-situ observat... | multidimensional gas chromatography applied to the enantioselective analysis of sugar compounds in extraterrestrial samples (screen 4) |
extinction. from 0.55 to 2.2μm, we employ the extinction curve of schlafly+, 2016apj...821...78s assuming ah/ak=1.55. from 2.2 to 37μm, we adopt the mir extinction curve derived by hensley & draine, 2020, j/apj/895/38 on the sight line toward cyg ob2-12. polarized extinction. between 0.12 and 4μm, we join a serkows... | vizier online data catalog: total/polarized extinction/emission postplanck era (hensley+, 2021) |
the massive and rich globular cluster terzan 5 contains at least 37 millisecond pulsars -- the most of any globular cluster. we have been timing these pulsars in the radio since 2004 using the green bank telescope, and the individual and combined properties have provided a wealth of science. we have measured long-term ... | three dozen pulsars over a dozen+ years in terzan 5 |
introductiononly two interstellar objects have been observed passing through our solar system to date. the first one, 1i/'oumuamua, discovered in 2017 in its post-perihelion phase, showed mostly asteroidal characteristics with some potential evidence of comet-like behaviour, but 2i/borisov has showed clear evidence of ... | unusual polarimetric properties for interstellar comet 2i/borisov |
"bespoke" refers to something custom or self-made. this paper continues the journey of an amateur learning spectropolarimtetry using an 18inch f3.5 reflector with homebuilt spectrometer modified to perform polarimetry, thus yielding the wavelength dependence of stellar polarization. polarization of starlight occurs as ... | a bespoke spectropolarimetrist |
high resolution polarization observations of spiral galaxies in far-infrared are enabling for the first time to study galactic magnetic fields deep into the cold dark molecular disks, where the most complex gas kinematics and star formation take place. taking advantage of hawc+, the far-infrared polarization imaging in... | the multi-phase spiral magnetic field of m51 |
the laser communication system with polarized beam splitting is a useful method for interstellar networking. in longdistance communication terminals which adopts a system of common aperture same frequency transmitting-receiving, the stray light comes from the inside system is generated by retroreflectance and scatterin... | stray light suppression of common aperture optical antenna for laser communication system |
dust continuum polarization observations have been conducted using the pol-2 polarimeter installed on the scuba-2 camera (hereafter scubapol2) at the james clerk maxwell telescope (jcmt), a 15m single-dish submillimeter observatory located on the summit of maunakea in hawaii, usa. pol-2 observations of the s201 region ... | vizier online data catalog: polarization measurements of s201 with jcmt (eswaraiah+, 2020) |
the spectral energy distribution of the coronal gas for two angularly large face-on spiral galaxies observed with xmm-newton observations, namely ngc 6946 and m83, are compared in detail with measurements of the regular and random magnetic field components as deduced from radio continuum data obtained with the vla in a... | heating of coronal gas in galaxies by magnetic reconnection |
we review five recent publications that extend magnetic turbulence studies that were pioneered using data from 1 au to now include voyager observations from 1977 through 1990 and 1 to 45 au. we examine the spectral scale at which evidence of dissipation sets in and evaluate the spectral indices, anisotropies, polarizat... | solar wind turbulence from 1 to 45 au |
we present 0.4 arcsec-resolution mid-ir imaging polarimetry, obtained with canaricam at gtc, of the central 0.11 pc x 0.28 pc (4.2 arcsec x 10.8 arcsec) region of w51 irs2. the observed mid-ir polarization across this region is typically several percent, with values as high as 12%. the polarization arises from ensemble... | gtc/canaricam mid-ir polarimetry of magnetic fields in star-forming region w51 irs2 |
the original appearance of chiral organic molecules in our universe is an essential component of the asymmetric evolution of life on earth. simulated interstellar ice experiments have indicated that circularly polarised light could be the initial source of life's handedness following prebiotic astrochemical condensatio... | photochemical synthesis, chirality and detection of the building blocks of life in 'simulated' cometary matter |
stars form during gravitational collapse in molecular clouds. this process governs how galaxies evolve over cosmic time by creating their stellar components. it also affects properties of the planets formed along with the young stars. collapse in molecular clouds during star formation is controlled by self-gravity, ran... | simplifi: a legacy investigation of interstellar magnetic polarization in star forming filaments |
the optical to submillimetre continuum radiation of the ism is polarised by aligned non-spherical dust particles. modelling of this polarisation spectrum in combination with abundance constraints and simultaneous fit to extinction and emission yields important information on dust grains, including chemistry, mineralogy... | dust polarisation in the interstellar medium |
we present alma 343ghz (band 7; 870um) polarization observations toward the very embedded intermediate-mass protostar serpens smm1. we complement these observations with new submillimeter array (sma) 345ghz (880um) dust polarization observations as well as with archival polarization maps obtained with the james clerk m... | vizier online data catalog: polarization data toward the protostar serpens smm1 (hull+, 2017) |
the next generation balloon-borne large aperture submillimeter telescope (blast-tng) is an experiment designed to map magnetic fields in molecular clouds in order to study their role in the star formation process. the telescope will be launched aboard a high-altitude balloon in december 2016 for a 4-week flight from mc... | the half wave plate rotator for the blast-tng balloon-borne telescope |
astrophysical dust grains become partially aligned due to magnetic fields that permeate the interstellar medium. measurements of far-infrared polarized emission provide a tool to characterize magnetic fields and test their effect on star formation in molecular clouds. the hawc+ camera provides polarimetric imaging capa... | hawc+/sofia polarimetric observations of omc-1 |
the far-infrared imager and polarimeter (fip) for the origins space telescope (origins) is a basic far-infrared imager and polarimeter. the camera will deliver continuum images and polarization measurements at 50 and 250 μm. currently available detector technologies provide sufficient sensitivity for background limited... | far-infrared imager and polarimeter for the origins space telescope |
the sun modulates with the solar wind flow the shape of the whole heliosphere interacting with the surrounding interstellar medium. recent results from ibex and inca experiments, as well as recent measurements from voyager 1 and 2, demonstrated that this interaction is much more complex and subject to temporal and heli... | evolution of solar wind flows from the inner corona to 1 au: constraints provided by soho uvcs and swan data |
pilot is a balloon-borne astronomy experiment designed to study the polarization of dust emission in the diffuse interstellar medium in our galaxy at wavelengths 240 μm with an angular resolution about two arcminutes. pilot optics is composed an off-axis gregorian type telescope and a refractive re-imager system. all o... | pilot optical alignment |
probing magnetic fields in the diffuse interstellar medium (ism) is generally achieved by polarimetry, including stellar polarization and polarized dust thermal emission. here we present a novel approach, i.e., the velocity gradient technique (vgt), for tracing the magnetic fields. vgt is developed from the fact that m... | probing magnetic field tomography with the velocity gradients technique |
scattering of pickup ion ring-beam distributions in the outer heliosheath is a fundamental element in the spatial retention scenario of the energetic neutral atom (ena) ribbon observed by the interstellar boundary explorer (ibex). according to our earlier linear instability analysis, pickup ion ring-beam distributions ... | high-frequency waves driven by pickup ion ring-beam distributions in the outer heliosheath |
because venus does not have a dynamo, the interactions between the solar wind and the ionized upper atmosphere are more extreme at venus than at earth. wave propagation direction with respect to the background magnetic field is necessary for calculation of energy exchange and wave mode identification, but local wave-fi... | analysis of foreshock plasma waves in the inner and outer heliosphere using minerva |
scattering properties of irregularly shaped interstellar composite dust analogues consisting of graphite and fayalite (fe2sio4) were studied using discrete dipole approximation (dda). two dust models were developed to calculate the scattering and extinction efficiencies, single scattering albedo, asymmetry parameter, p... | scattering by interstellar graphite and fayalite composite dust analogues: computer simulation and laser-based laboratory measurements |
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