cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.57780/esa-7yfcxvc
title: 090472

description: Every major modern hydrodynamical simulation suite now includes a prescription for AGN feedback to reproduce realistic populations of galaxies. However these simulations generally do not offer much insight into the nature of feedback. On the other hand the hot gas content of galaxy groups is highly sensitive to the implemented feedback scheme: the predicted gas fraction differs by an order of magnitude from one simulation to another. Here we propose to observe a sample of 40 galaxy groups exhibiting X-ray emission on scales  and amp amp amp gt 12 with the aim of providing benchmark thermodynamic and gas fraction profiles out to R500 without requiring any extrapolation. The proposed program will gather a well controlled sample of systems spanning an order of magnitude in mass 1e13  and amp amp amp lt  M500  and amp amp amp lt  1e14 Mo. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-80ls5cx
title: 090074

description: Suzaku observations of the outskirts of the Virgo cluster have revealed a very high gas mass fraction to the North and South while the entropy unphysically decreases outwards. This suggests a very high level of clumping and/or non thermal pressure support. XMM.s high spatial resolution allows it to constrain the level of gas clumping by binning images into a tessellation. Here we propose 5 XMM observations totaling 155ks to cover the regions of Virgo where the Suzaku has found the highest gas mass fraction and lowest entropy. This will allow us to constrain gas clumping to clumping correct the thermodynamic profiles and infer the level of non thermal pressure support. Virgo.s proximity allows us to probe clumping with 100x better spatial resolution than before. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-8hg9is9
title: 090023

description: PG 0043+039 is the most X-ray weak quasar known. XMM-Newton observation in 2013 set a clear detection meaning a flux at least 3.8 times higher than in 2005. The quasar remained extremely X-ray weak with a peculiar spectral energy distribution (SED) and a unique UV spectrum. This unique source deserves further deeper observations to establish its X-ray spectrum its optical to hard-X-ray SED and its variability. We aim at probing our hypothesis that PG 0043+039 is a genuine X-ray weak quasar and to test alternative scenarios (ADAFs missing corona cyclotron-emission). We propose to observe PG0043+039 quasi-simultaneously (2 days) with XMM-Newton (20+100ks) NuSTAR (60ks) HST (2 orbits) 10m Hobby-Eberly and 10m SALT Telescope in South Africa. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-8tfit16
title: 090199

description: X-rays have been detected from a wide variety of worlds in our Solar System for many years. These range from terrestrial planets to the Gas Giants moons comets and even Pluto. However the first detection of X-rays from Uranus was announced this year using data from the Chandra X-ray Observatory (CXO) opening the possibility of studying the mysterious Ice Giant planets through their X-ray emissions. Results revealed that the X-ray flux from Uranus was higher than expected from scattered solar X-rays hinting that there may be high energy processes producing X-rays at the planet. As for Jupiter and Saturn this may include ring fluorescence and auroral emissions. XMM-Newton.s superior sensitivity and spectral resolution will potentially revolutionise our understanding of this world. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-939isak
title: 088375

description: We propose to observe the complete sample of confirmed binary Be stars with sdO companions. We aim to probe the essentials of binary evolution theory which predicts that Be-type stars are the products of close binary evolution and that a significant fraction of them have hot companions which were stripped of hydrogen during a mass exchange event. The proposed survey will lead to a characterization of X-ray emission from Be+sdO binaries and establishing their X-ray properties. Furthermore we propose to measure the X-ray spectra of two prototypical Be+sdO systems phi Per and o Pup to measure the hot plasma temperatures and emission measure and to validate a hypothesis about stellar wind collisions in Be binaries. [truncated! Please see actual data for full text]
DOI: 10.25549/examiner-c44-14506
title: Paternity suit, 1951

description: 4 images. Paternity suit, 6 August, 1951. Mrs. Bonita Fiedler Davis -- 27 years; Michael Brian Davis.; More descriptive information with originals.
DOI: 10.57780/esa-9guvwo6
title: 089062

description: The hard X-rays from accreting white dwarfs (WDs) in magnetic cataclysmic variables (CVs) are produced by shock-heating in the accretion column and the measured temperature of the accreting material depends on the mass of the WD. With high-quality hard X-ray spectra it is possible to determine the WD mass. An important question is whether the WD mass distribution extends up to the Chandrasekhar limit. The best place to look for high-mass WDs is among CVs with the hardest spectra making CVs found in the hard X-ray INTEGRAL survey excellent candidates for having the most massive WDs. We propose NuSTAR and XMM observations of two IGR CVs. In addition to measuring the WD masses the observations will be used to search for periodic signals expected to be seen at the WD rotation period. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-9zgwxl1
title: 089160

description: Relativistic jets are thought to play a key role on the formation of massive galaxies and supermassive black holes. Radio and X-ray observations provide the most direct probes of SMBHs accretion mechanisms and jets physics. However currently there is a dearth of radio sources at z and amp amp amp gt =7 which in turn are a key missing population for future 21 cm absorption studies well within the epoch of reionization. We propose quasi-contemporary VLA/XMM observations of a new redshift-record radio source at z=7 for which archival non-simultaneous 1.4 and 3.0GHz data reveal an atypical sharply rising spectrum of index +0.6 that could be compatible with a blazar. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-ae87rqt
title: 090273

description: PSR J1627+3219 is a millisecond pulsar (MSP) recently discovered by the Five hundred meter Aperture Spherical radio Telescope (FAST). Subsequent analysis of the corresponding Fermi-LAT source resulted in the detection of strong gamma-ray pulsations. Follow-up timing observations reveal that PSR J1627+3219 is in a black-widow binary system with high spin-down power and exhibits transitional behaviors. We propose a 30 ks XMM observation covering two full orbits of the binary system in order to detect the X-ray counterpart and possible orbital variability/modulation in the X-ray emission from this unique pulsar. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-aj2t90o
title: 088462

description: We propose a deep observation of DEM L71 a middle-aged Type Ia SNR in the LMC primarily using the Reflection Grating Spectrometers (RGS). Previous XMM-Newton and Chandra studies of this SNR revealed the centrally-peaked emission from the Fe-rich ejecta indicating that the whole supernova ejecta have been heated by the reverse shock. Our analysis of the existing RGS data indicates an unusually low Ni/Fe mass ratio although its uncertainties are somewhat large. Theoretically such low Ni/Fe ratio is expected only for a thermonuclear explosion of a sub-Chandrasekhar-mass white dwarf (sub-MCh WD). With this proposed observation we will put a stringent constraint on the Ni/Fe ratio providing the first robust evidence of the sub-MCh progenitor for a single Type Ia SN/SNR. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-bewgx1x
title: 091239

description: The ultraluminous X-ray source population is now broadly expected to be dominated by super-Eddington accretors thanks to the broadband spectroscopy provided by NuSTAR and XMM-Newton in combination and the detection of X-ray pulsations from a growing subset of ULXs (unambiguously confirming them as super-Eddington neutron stars). IC 5052 ULX and ESO 501-023 ULX are extreme ULXs (LX peak  and amp amp amp gt  1040 erg so???1) that have received very little observational attention to date. Here we propose coordinated 100+50 ks NuSTAR+XMM-Newton observations of these sources in order to constrain their broadband spectra and search for pulsations. These observations will provide the first robust constraints on the nature of these two extreme binary systems. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-bifm3tx
title: 093299

description: The PN energy resolution is time dependent. This effect is corrected in  the RMF using the EPN_REDIST CCF.The current calibration is based on Circinus Galaxy observations performed in 2001 and 2014. A new observation of this target is required to update the correction.  Circinus Galaxy is a bright Seyfert 2 galaxy and is characterised by a highly absorbed hard X-ray spectrum with a bright Fe-K fluorescent line. Comparison of the measured width of this line over time can help constrain the modelling of the time-evolution of the PN resolution. [truncated! Please see actual data for full text]
DOI: 10.25549/examiner-c44-73152
title: Santa Barbara (scenes around Santa Barbara, also the harbor), 1952

description: 28 images. Santa Barbara (scenes around Santa Barbara, also the harbor), July 27 1952. Robert Grasley; Al Whitney; W.R. Kelso; "Linda" fishing boat; Donna Windsor; Melinda Massey; Carolyn Smith; Campus of the University of California; Sorting lemons; Old Lebero Theatre; Santa Barbara Court House; Mission.; Caption slip reads: "Photographer: Rustan. Date: 1952-06-27. Assignment: Santa Barbara. 31: Robert Grasley, research technical director. 68: Al Whitney, ties up plastic horse. 67: W.R. Kelso, extrusion operator of plastic tubing. 45: 'Linda' unloading 6 ton anchovie [sic.] catch. 81/46: Same, closer. 82: Fishing from Stearn's Wharf with beach in back. 19/20: H.B. De Mott Lemon Grove and home in Hope Ranch Park. 54: Santa Barbara campus of University of California. 53: Home of Mrs. Claude Arnold in Hope Ranch Park. 55/56: General view of Santa Barbara and State Street taken from Granada(?) Building. 17: Santa Barbara Mission under repair. 18: Tourists snapping pictures in front of Santa Barbara Mission. 59/60: Yacht harbor toward center of town. 85/86: Culling lemon before packing. 61: Lemons being sorted by color for storage. 62: High school girls work summers sorting lemons. Donna Windsor; Melinda Massey; Carolyn Smith. (Lemon shots at Goleta Lemon Association). 87/88: Old Lobero Theater. 1/2: Santa Barbara Court House".
DOI: 10.57780/esa-bp7np1n
title: 090354

description: The nearby AGN-starburst galaxy NGC 4945 offers the best case for probing reprocessing in the impact zone where the AGN meets the starburst and where evolutionary models can be tested. We request a long XMM observation to perform spatially-resolved spectroscopy along the Chandra-discovered X-ray b [truncated! Please see actual data for full text]
DOI: 10.57780/esa-c4cl1cb
title: 088611

description: Covering the central 20*2.5deg2 of the Milky Way disc with 20ks XMM exposures will allow us to measure the flows of hot baryons emerging from the energetic activity in the disc to detail their impact on the surroundings and to connect the sources in the disc with the base of the Galactic outflow. By connecting the requested XMM scan with the shallow all sky eROSITA survey we will determine whether the activity in the Galactic disc is important for feeding and sustaining the Galactic corona. This study will provide us with an excellent archetype for advancing our understanding of galaxy evolution theory in a Milky-Way-class galaxy. This project will produce a legacy dataset that will be used in the future for multiple purposes including multi-wavelength and time-domain investigations. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-c582aao
title: 087086

description: The JWST Deep Time-Domain Field in the North Ecliptic Pole is a GTO target that will have continuous visibility and 8-band deep imaging and grism spectra in the NIR by JWST. In the past few years the NEP DTDF has grown into a comprehensive survey with deep radio to X-ray data becoming the most promising new field for extragalactic studies and time-domain investigations. Given interesting results from Cycle 5 NuSTAR program we request 780 ks for long term monitoring of the NEP DTDF split into 4 epochs (spaced before and after JWST launch over 2 NuSTAR cycles) enabling studies of hard X-ray variability 0.3-24 keV spectroscopy through simultaneous XMM observations the faint end of the AGN luminosity function at  and amp amp amp gt 8 keV the obscured AGN fraction and a bright NLSy1 at z and amp amp amp gt  1. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-c9mlora
title: 090214

description: Ultraluminous X-ray sources (ULXs) are extragalactic X-ray sources possibly hosting super-Eddington accreting black holes or neutron stars. The ULX population shows sources with randomic long and short-term variability. We selected the twelve nearby ( and amp amp amp lt 20 Mpc) galaxies that most probably host ULXs and that were not observed in X-rays. We ask for snapshot (10 ks) observations to complete the census of ULXs in the nearby universe. [truncated! Please see actual data for full text]
DOI: 10.25549/examiner-c44-54829
title: Harbor series (Long Beach Harbor), Los Angeles Harbor), Series by John McDowell, 1953

description: 28 images. Harbor series (Long Beach Harbor), Los Angeles Harbor), Series by John McDowell, 23 August 1953. Vincent Thomas (Assemblyman); General scenes.; Supplementary material reads: "Chernus captions -- Harbor series. (For future use, Negatives to Riblett). #1 and #2: Long views of undeveloped land owned by Harbor Department -- along San Pedro shore of Los Angeles Harbor's main channel. #3 and #4: Assemblyman Vincent Thomas examining loose timber and gaping hole in San Pedro's 60-year-old onetime lumber wharf -- now abandoned except for mooring of harbor tugs. #5 and #6: Long view of 60-year-old onetime lumber wharf -- now owned by Harbor Department but undeveloped. #7: Long view of new San Pedro Fish Market facilities in Los Angeles harbor. #8: Long view of boats tied up at Fisherman's Wharf. The wharf and fish market are only new structures in San Pedro section of the harbor in the last 40 years. #9: A tanker heads down main channel past San Pedro's undeveloped waterfront. #12: Long view North from San Pedro ferry building, showing dilapidated docks along city's waterfront. #13: View of ferry coming into San Pedro. #14: Shot of ships at now Matson Terminal. #15: Long view of Bascule drawbridge, with new Commodore Hei, Lift Bridge in the background. These two spans are the only land connection between Terminal Island and the mainland. #16: Dilapidated docks in Los Angeles Harbor, adjacent to Hammond Lumber Co. wharves on Terminal Island. #17: Freighter Harry Luckenbach loading at Berth 228-E On Terminal Island".; Supplementary material continues: "Chernuscaptions -- Harbor series. #18: Ancient wooden wharf of Outer Harbor Dock and Wharf Co., leased from Harbor Department on 50-year lease which expires in 1956. The section shown includes Berths 51 to 55. Wharf is 50 years old. #19: Another view of Berths 45 to 51 along decrepit docks leased by Outer Harbor Dock and Wharf Co. in San Pedro. #20: Vacant stores on 6th Street, San Pedro's main shopping district. There are 78 vacant stores in central shopping district, 250 throughout the entire downtown area. #21: Long view of nearly deserted 6th Street, San Pedro, on what should be a busy Saturday afternoon. #22: Freighter Fairland loading drums of asphalt at busy Long Beach Harbor, where oil revenues in last 15 years has built a port that is threatening to outgrow Los Angeles Harbor. #23: Exterior view of Port of Los Angeles' Foreign Trade Zone, a new harbor installation in San Pedro's outer harbor. Here foreign ships can land cargo duty-free for repackaging and re-shipment out of U.S. The enterprise, however, has been losing money. #24 and #25: View of large empty stores on 6th Street in San Pedro's downtown shopping district".
DOI: 10.57780/esa-chjtg1g
title: 090211

description: Multiwavalength polarization and in particular X-ray polarization is an important probe of the magnetic field geometry and high-energy emission processes of blazar jets. The Imaging X-ray Polarimetry Explorer (IXPE) scheduled for launch in December 2021 will open a new window to the Universe through high-energy polarization.  Here we propose contemporaneous OM/PN/MOS -- UV-X-ray observations of IXPE blazar targets. The proposed observations will supplement our planned multiwavelength campaign from radio to gamma-rays. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-ci2dzdf
title: 090234

description: Pulsar J1320-5359 was recently discovered to have one of the highest ever measured long-term braking indices (n and amp amp amp gt  100). This is far in excess over the canonical value of 3 that one would expect if pulsars slow down their rotation as rotating magnetic dipoles. Although some variation of n (on the order of a few) around 3 has been seen before such extremely large braking indices are a novel finding and their physical origin is unclear. A promising hypothesis suggests magnetic field decay as explanation. This can be observationally checked since magnetic field decay should also manifest itself in an unusually high thermal X-ray luminosity. Based on several properties PSR J1320-5359 is the best target to test whether the magnetic field decay hypothesis can explain the high braking indices. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-cijqrd4
title: 090163

description: Triple AGN are signposts of ongoing galaxy mergers and are the observational progenitors of the loudest low-frequency gravitational wave (GW) events in the Universe. Thus studying the population of triple galaxy merger systems for evidence of SMBH activity is imperative to understanding the expected GW event rate detectable with pulsar timing arrays as well as which environmental dependencies are linked with AGN activity. However to date only one serendipitously discovered X-ray triple AGN has been identified. We propose to observe 8 nearby (0.018 and amp amp amp lt z and amp amp amp lt 0.051) triple galaxy mergers with XMM-Newton and measure the number of AGN in each triple merger system.  These observations will expand upon results from a recent X-ray analysis of 7 triple galaxy mergers that had existing archival X-ray data. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-cj8r2nt
title: 087084

description: After a 10-year break Mrk 590 is rekindling its nuclear activity with a rise in X-ray flux! We wish to seize this rare opportunity to record for the first time the onset of AGN activity as it occurs since this can lead to significant insight on the long-standing issue of how AGNs are triggered and fueled. We ask to trigger up to 3 single-visit joint NuSTAR/Swift/XMM observations to determine if a standard thin accretion disk is being built up as the AGN turns on or if alternate physics are at play. Relatively inexpensive XMM exposures are needed to constrain any intrinsic absorption. The data are also ideal for testing the recent prediction that quasi-periodic eruptions can explain the flux changes seen for Mrk 590. [truncated! Please see actual data for full text]
DOI: 10.25549/examiner-c44-72687
title: Santa Fe train wreck, 1956

description: 25 images. Santa Fe train wreck, 22 January 1956. (Sleeve reads: A-11701-018).
DOI: 10.57780/esa-ckqip2s
title: 091259

description: The proposed observation of seven obscured AGN are necessary to obtain a complete and uniform coverage of the X-ray emission for the sample of Seyfert-2 galaxies from the 12micron galaxy sample (12MGS). Coupled with the broad-band X-ray observations available for the remaining 12MGS AGN the proposed observations will allow us to investigate the column density distribution at low redshift for a complete and unbiased AGN sample (because of its mid-IR selection) and to connect the accretion properties to those of the hosts by exploiting the unique multi-band characterization and coverage of the proposed sample. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-ckufawx
title: 091309

description: We propose to observe one extremely luminous and hard ultraluminous X-ray source NGC 4254 X2 simultaneously with NuSTAR and XMM to study its broadband spectral properties for the first time and search for pulsation in the new high S/N data. The source is well isolated from other X-ray sources but has received very little observational attention so far and hence the broadband spectral features of this source are still unknown. Analysis of archival soft X-ray data suggests that this source is a potential pulsar ULX candidate. New broadband data can potentially confirm this prediction while constraining the physical parameters related to the accretion. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-crendbg
title: 088264

description: Since 2014 the symbiotic recurrent nova T Coronae Borealis has been in a high accretion rate state rapidly accumulating the hydrogen-rich fuel that the massive white dwarf in this system will need for its next nova eruption expected within several years. T CrB is evolving within this high state with the optical light showing a gradual fading. XMM observations in 2017 2018 and 2020 however suggested that the accretion rate remained relatively constant. The observed differences appear to be caused by changes in the intrinsic absorber probably related to the accretion disk wind. We therefore propose a set of two joint XMM-HST observations to monitor the accretion rate through the Keplerian disk and the boundary layer and the amount of X-ray/UV absorber during this crucial period. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-cupvtwj
title: 090158

description: Radio galaxies take a variety of morphology. One particularly interesting class is the bent radio source as it probes the environment and provide constraints on properties of ambient medium and dynamics. Future radio surveys will detect millions of bent radio sources unleashing its great potential to study ICM/IGM and dynamics. On the other hand it is still unclear whether all bent radio galaxies are associated with groups and clusters. In this proposal we focus on nearby (z and amp amp amp lt 0.04) NATs to test the simple hypothesis that all NATs are in groups or clusters. A sample of NATs not in known groups/clusters are selected for XMM observations. For their proximity they present best chances to invalidate the hypothesis which would have important implications for the formation of NATs. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-cutnpuh
title: 091243

description: Understanding the nature and origin of spectral variability provides us with key information about the accretion-outflow mechanism in active galactic nuclei (AGN). Changing-look AGN show the most striking cases of spectral variability in AGN. NGC 3516 is a remarkable Seyfert-1 galaxy which over the last decade has undergone major optical-UV-X-ray spectral transformations classifying it as a changing-look AGN. The extensive Swift monitoring of NGC 3516 shows that it is currently in a state of long-term transition between the extremely low-flux state and the historical high-flux state. The proposed joint NuSTAR (60 ks) and XMM-Newton (60 ks) observations of this transition state aim to gain new insights into the mechanism of transition between the different states of the changing-look AGN. [truncated! Please see actual data for full text]