cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.57780/esa-u5xip4y
title: 088105

description: Suspicious dips have recently been found in the light curves of some young M dwarfs. At first these dips were thought to be transiting exoplanets but the changing phase and depth over time scales of weeks makes an exoplanetary origin unlikely. We suggest the presence of extremely dense slingshot prominences as the cause for this variability. We have recently discovered an M dwarf with this behavior that is very X-ray bright allowing to test the slingshot prominence scenario by testing whether a deep dip in X-rays occurs at the same time as the shallow optical dip. We propose to observe the star for 1.2 rotation periods i.e. a total of 115ks with XMM-EPIC. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-uhybnsh
title: 090233

description: Magnetars are neutron stars mainly powered by their huge magnetic fields.  They go through long stretches of quiescence interrupted by periods of activity  via short X-ray bursts large giant flares and yearly-timescale X-ray outbursts. Lately several normal pulsars showed magnetar-like emission and FRB-like events were observed during a short X-ray burst prompting important questions on the exact physics and reach of the magnetar phenomenon. We propose a Joint XMM  (110ks) and NRAO/GRB (14hr) ToO program aimed at gather new physical insights on magnetars surface field configuration and magnetosphere  search for radio pulsed emission and for (quasi-)simultaneous X-ray and radio bursts. We might trigger this program on any source that will undergo a magnetar-like outburst during AO21. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-uj4ga5t
title: 090435

description: We propose XMM-Newton observations of four local AGN which have recently been observed to transition between types 1 and 2 (or vice versa).  Our targets were identified in a thorough search of the BASS sample of BAT-selected AGN and have multi-epoch optical spectra covering the past 10-20 years. Each source has an archival X-ray spectrum from either XMM-Newton Chandra or SWIFT allowing us to compare their current X-ray spectral properties with those observed before the optical state transition. The proposed observations will provide a unique and timely insight into accretion disc physics inform our understanding of when and how the Broad Emission Line Region is formed around AGN and provide a valuable benchmark in studies of  changing-state AGN. [truncated! Please see actual data for full text]
DOI: 10.25549/examiner-c44-82222
title: Fire at apartment -- 4215 Montclair Street, 1954

description: 2 images. Fire at apartment -- 4215 Montclair Street, 17 April 1954. Firemen cleaning up burned out apartment.; Caption slip reads: "Photographer: Olmo. Date: 1954-04-17. Reporter: Adler. Assignment: Apartment fire. 27/28: Firemen cleaning up burned out apartment at 4215 Montclair Street".
DOI: 10.57780/esa-uoixe76
title: 090162

description: In galaxy clusters cooling from the intra-cluster medium provides the cold gas which fuels the central AGN and thus maintains thermal balance. We also see evidence of such cooling in massive X-ray luminous groups. However some lower luminosity groups have central galaxies which are actually richer in cold gas despite their lack of cool cores or active radio jets. We propose to observe two such systems with the goal of determining the properties and dynamical state of the intra-group medium measuring their cooling rate and searching for evidence of old AGN outbursts. Moderate exposures will provide order of magnitude increases in depth over the available observations for these groups giving us new insight into the origin of their cold gas reservoirs. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-up6olsn
title: 088620

description: The growth of Supermassive Black Holes powering luminous quasars at the Epoch of Reionization (EoR z and amp amp amp gt 6) is a hot topic in astrophysics. These quasars are being characterized with large multiwavelength campaigns with current flagship observatories. X-ray observations performed so far provided mostly  and amp amp amp lt  15 counts in 0.5-10 keV spectra and thus a poor characterization of their properties. We propose HYPERION a 2.3 Ms Multi-Year Heritage programme to dramatically improve data quality to 100 counts for 15 luminous quasars at EoR delivering unprecedented constraints on nuclear properties accretion ejection disc/corona complex. It will nicely complement observations at other wavelengths enabling meaningful X-ray spectroscopic studies at EoR to begin. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-urcx6xz
title: 090470

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-uufnqcg
title: 090212

description: 3HWC J1928+178 is one of the brightest Galactic gamma-ray sources detected by HAWC up to virgul56 TeV and potentially associated with one of the dozen PeVatron sources discovered by LHAASO. Given no apparent pulsar wind nebula or supernova remnant in the vicinity  the HAWC source still remains unidentified. Recent X-ray and TeV observations as well as our multi-wavelength SED study pinned down the HAWC source to be either a PeVatron pulsar wind nebula TeV halo or TeV gamma-ray binary. In particular we found two X-ray counterpart candidates of the HAWC source - a variable X-ray source with a massive companion and putative diffuse X-ray emission. We propose a follow-up XMM observation of the X-ray counterpart candidates for determining the nature of this enigmatic HAWC source. [truncated! Please see actual data for full text]
DOI: 10.25549/examiner-c44-101886
title: Society, 1951

description: 10 images. Society, August 19, 1951. Mrs. Chester Bowers; Mr. and Mrs. Peter Rathvon; Mr. and Mrs. Charles Emery; Mr. and Mrs. Russell Havenstrite; Harold Grieve; Mr. and Mrs. Walt Disney; Lester Jenks; Ruth Mann; Hugh Mann; Mrs. Mary Whiting; Mrs. Leroy Newbert; Dr. Francis Brown; A. Aviles; David Brant; Mr. and Mrs. James Holt; Czarina Alvarez; Mrs. Hugh Golden; Antonio Moreno; Elwood Henry.; More descriptive information with originals.
DOI: 10.57780/esa-uxyek5h
title: 090286

description: The Gaia Gravitational Lenses working group (GraL) has dramatically increased the number of known lenses in the past three years particularly doubly-imaged quasars. X-ray observations of these rare systems provide a powerful tool for a range of studies from inferring the structure near the event horizons of supermassive black holes to measuring black hole spins at cosmological distances.  We propose a snapshot survey of the brightest newly identified doubles to establish a baseline sample for deeper observations and monitoring. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-v6cd1lu
title: 088062

description: Based on a dedicated XMM-Newton monitoring campaign started in 2015 we have recently revealed an X-ray activity cycle on the young solar-like star epsilon Eri. From 2014 - 2017 the X-ray and the CaII emission of eps Eri changed in a synchronized way with the 3-yr period of the Ca S-index that dominated the chromospheric variability of the star for the last two decades. Then in 2018 a drastic change set in: Both the S-index and the X-ray emission appear to have switched to a lower average activity level and whether X-ray and CaII emission are still cyclic and in phase is unclear. We propose to examine the long-term evolution of eps Eri.s X-ray cycle during an important change in its activity state with continued monitoring for 2 x 5 ks. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-vffhtji
title: 092075

description: The extraordinary symbiotic binary RT Cru which hosts a massive ( and amp amp amp gt 1.25 solar masses) white dwarf (WD) and thus is a serious candidate to be a SNIa progenitor is currently in a new optical/hard X-ray bright state  the previous one was detected in 2012 in optical photometry and with Swift/BAT. At that time the accretion rate onto the WD increased but did not reach the value where the accretion disk boundary layer transitions to the optically thick regime. We propose to observe RTvirgulCru with XMM and NuSTAR during the current maximum --an event that is unlikely to repeat within the next ten years -- in order to fully characterize the 0.3-80 keV spectrum during the maximum allowing us to measure the shock temperature and thus the WD mass and the accretion rate through the boundary layer. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-vhgr7w1
title: 089064

description: Obscuring outflows are remarkably different from the common warm-absorber outflows in AGN. They exhibit large columns of high-velocity gas close to the black hole. They shield much of the X-ray radiation which can have important implications for the surrounding gas and the launching of outflows. Joint ToO observations with NuSTAR and XMM triggered using Swift monitoring have been instrumental for the new results on obscuration events to come into light. We request a ToO NuSTAR observation (50 ks) to be taken jointly with a XMM-Newton observation (50 ks) using weekly Swift monitoring of an AGN sample (93 ks in total). [truncated! Please see actual data for full text]
DOI: 10.57780/esa-vu5hsci
title: 091320

description: IGR J17407-2808 is an enigmatic and poorly studied X-ray binary with variability properties typical of the class of supergiant fast X-ray transients. Nevertheless it hosts a late type-F dwarf star which would classify it as a low-mass X-ray binary although its X-ray properties are very different from those of this class. We propose a simultaneous NuSTAR and XMM-Newton observation to perform the most sensitive spectral and timing study of this source on a wide X-ray band (0.2-79 keV). The X-ray observations will be accompanied by optical spectroscopic observations with X-sthooter and will enable us to collect information about IGR J17407-2808 fundamental to understand its nature and the X-ray emission mechanism that powers it. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-w1nx07r
title: 090172

description: We propose to observe three FR0 radio galaxies that are recently detected for the first time in the gamma-ray band for a total of 110 ksec with XMM-Newton. These sources have no previous X-ray spectral measurements. The XMM observations will allow us to characterize the X-ray spectral behavior of the proposed sources which will enable us to accurately determine the associated jet power and the particle population responsible for the observed emission. We will also compare the derived results with other gamma-ray emitting FR I and II radio galaxies. [truncated! Please see actual data for full text]
DOI: 10.25549/examiner-c44-17891
title: Fiesta, 1951

description: 23 images. Fiesta, 2 August 1951. Jose Manero (Dance Director); Paquita del Rey; Kay Chapman; Marjorie Hall; Frater August; Frater Carroll; Pattye Reily; Ann Lamb; Connie Harder; Chantal de Lendonck; Mr. and Mrs. Francis Price; Joann Cobb; Beverly Agnew; Lois Byllesby; Mrs. Diane Noble; Mrs. William Sears; Jane Manning; Cynthia Wood; Mrs. F. Bertram Zener; Helen Andros; Sally Libke; Mary Kay Martz; Mrs. Ralph Raddue; Marleen Anderson; Mrs. Paul Trent; Royle Dawn Baker; Sue Trent; Robyn Baker.; Caption slip reads: "Photographer: Jensen. Date: 1951-08-01. Reporter: Horn. Assignment: Fiesta. 3-4: Miss Chantal de Lendonck; Mrs. Francis Price; 7-8: Mrs. Francis Price; Miss Joann Cobb. 9-10: Mr. & Mrs. Francis Price. 11-12: Mrs. Diane Noble; Mrs. William Sears;; Miss Jane Manning; Miss Cynthia Wood. 5: Mrs. Diane Noble; Miss Jane Manning. 37-38: Frater August, Frater Carroll, Jose, Paquita, Pattye Reily, Ann Lamb, Connie Harder. 64-65: Mrs. Ralph Raddue; Miss Marleen Anderson; Mrs. Paul Trent; Miss Royle Dawn Baker; Miss Sue Trent; Miss Robyn Baker. 67-68: Beverly Agnew; Lois Byllesby. 6, 102-103: Mrs. F. Bertram Zener; Miss Helen Andros; Miss Sally Libke; Miss Mary Kay Martz (standing). 68-69: Miss Helen Andros; Miss Mary Kay Martz (standing); Miss Sally Libke".
DOI: 10.57780/esa-w506p78
title: 088232

description: The temporary disappearance of radio emission from a pulsar is known as .nulling. The nature of nulling is not fully understood yet but it is considered as evidence of turning off the magnetospheric activity. A changed magnetospheric activity can affect the pulsar.s X-ray emission too in particular if these changes persist for some time. Nulling pulsars are usually too faint in X-rays to detect emission disappearance in the typically short nulling intervals. The nearby isolated PSR B1706-16 shows sufficiently long nulling intervals and may be X-ray bright enough to explore the nulling phenomenon in X-rays for the first time. The proposed short observations will establish the X-ray properties needed for planning a longer follow-up observation. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-w7vn3ll
title: 090237

description: Accreting white dwarfs (WDs) can be strong emitters of X-rays. In intermediate polar (IP) type cataclysmic variables the accreting material is funneled onto the WD.s magnetic poles.  The X-rays are produced by shock-heating and the temperature depends on the WD mass.  Thus X-ray spectra provide a WD mass measurement. 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 IPs with the highest temperatures making IPs found by INTEGRAL strong candidates for hosting the most massive WDs.  Here we propose XMM-Newton and NuSTAR observations of two IGR sources that are likely IPs. The goals include detecting the WD spin period to confirm the IP natures of the sources and to measure the WD masses. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-wat5pc9
title: 088377

description: QPEs are extreme soft X-ray bursts recurring on hours timescales associated to low-z galactic nuclei. Until a few months ago only two such sources were found and currently the only way of systematically finding new QPEs is provided by SRG/eROSITA. In AO19 we were able to discover in synergy with XMM-Newton two new QPEs. Thanks to this pilot study we are now confident in finding 3-4 good candidates every year. We plan to use 1-1.5yrs of eROSITA data to trigger XMM-Newton during AO20 therefore we ask for 4 ToO observations to be performed on 4 different candidates each with a length of 130 ks. By the end of AO20 this synergy can double the number of the now 4 known QPEs which will allow us to better understand and characterise these new and interesting phenomena. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-wclzpdt
title: 089105

description: We propose here a broadband X-ray study of a peculiar hyper-Eddington Active Galactic Nucleus namely IRAS 04416+1215 by observing it simultaneously with NuSTAR (170ks) and XMM-Newton (40ks). IRAS 04416+1215 has one of the highest Eddington-ratio in the local Universe (lambdaEdd=427) it represents a prototype for the elusive class of hyper-Eddington AGN. The aim of these simultaneous observations is to understand the behaviour of the primary power-law and the reprocessed radiation in the regime of extreme accretion as well as the properties of soft-excess and the outflows. To this end the combined large effective area of XMM-Newton and high sensitivity of NuSTAR at high energy are fundamental to constrain the spectral parameter of the proposed target. [truncated! Please see actual data for full text]
DOI: 10.25549/examiner-c44-102331
title: 60th wedding anniversary, 1954

description: 4 images. 60th wedding anniversary, 1 September 1954. Mr. and Mrs. William M. Nelson.; Caption slip reads: “Photographer: Brunk. Date: 1954-09-01. Reporter: Sid Bernstein. Assignment: 60th wedding anniversary of Mr. and Mrs. William M. Nelson, 3045 East Gainsborough drive, Pasadena. 63/64: Mrs. Nelson, 81, peeks from behind a fan at her husband, William, 83.1/2: Mr. and Mrs. Nelson toast each other with anniversary celebration champagne”.
DOI: 10.57780/esa-wnw05jb
title: 090259

description: 1ES 1927+654 the first changing-look AGN caught in the act of changing phases has undergone extreme spectral changes over the last 3 years including the destruction and recreation of the X-ray corona possibly due to a tidal disruption event in a pre-existing AGN accretion disk. The latest XMM-Newton observation is similar to the pre-outburst observation from May 2011 but reveals a hint of an iron line which was notably missing in the 2011 observation. We propose one more simultaneous XMM-Newton/NuSTAR campaign of 1ES 1927+654 totaling 70 ks over two 35 ks observations to probe the late-stage evolution of this paradigm-defying AGN. The hard X-ray spectrum will allow us to track the heating of a newly-formed corona for the first time and determine whether the iron line has appeared. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-wp8v6ys
title: 090057

description: We request 35ks exposure time to measure X-ray spectra of two prototypical massive binary Be stars with sdO companions.  We aim to probe the 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 by a mass exchange. These hot ..stripped. companions with sdO spectral types  drive stellar winds which could collide and interact with the Be star winds and disks and hence have  unique signatures in their X-ray emission.  The two prototypical Be+sdO systems phi Per and o Pup probe different orbital configurations primary.s spectral types and sdO-star mass. Comparative analysis of their X-ray spectra will uncover leading processes responsible for plasma heating in Be+sdO stars. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-wwq36ag
title: 088526

description: We have discovered an unprecedentedly long ( and amp amp amp gt 14 yrs) X-ray tidal disruption event (TDE) candidate with several interesting signatures of super-Eddington accretion: quasi-soft X-ray spectra Eddington-limited luminosity and later transition to the thermal state with much softer spectra. One important prediction of our identification of the source as a super-Eddington accreting TDE is the significant decrease of the source luminosity and the softening of the X-ray spectra in the new few years. Therefore we request one more XMM-Newton observation of this event in AO20 two years after the last monitoring when it is in a phase of faster decay. Continuing monitoring is critical for the modeling of the event and confirmation of its nature as the most spectacular TDE known. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-x5iaahq
title: 092116

description: We propose to observe the Seyfert galaxy NGC 4151 with XMM-Newton (50 ks) and NuSTAR (100 ks) simultaneously to the scheduled IXPE (Imaging X-ray Polarimeter Explorer) pointing. Accurate measurements of the hot corona parameters have been reported but no significant constraints on the coronal geometry (slab sphere semi-sphere) have been possible so far. X-ray polarimetry has the potentiality to provide such constraints but the signal is partly degenerate with respect to the geometrical and physical parameters of the accretion disk-corona system. To reduce them and constrain the geometrical shape of the corona simultaneous and independent constraints on coronal temperature and optical depth strength of the reflection components provided by a joint XMM-Newton and NuSTAR observation are vital. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-xh7g4yj
title: 090278

description: We propose a deep EPIC observation of the highly asymmetric young ( and amp amp amp lt  600 years old) core-collapse (CC) supernova remnant G350.1--0.3 whose spectrum is dominated by iron-rich ejecta expanding at up to 6000 km/s away from an almost-stationary thermally emitting neutron star (CCO) and for which a very high nickel abundance has been claimed.  We shall quantify emission from Ni and Cr in addition to Fe to derive constraints on nucleosynthesis in explosive Si-burning regions.  We shall also pursue hints of nonthermal emission search for faint ejecta elsewhere near the CCO search for the blast wave and obtain a very deep spectrum of the CCO. G350.1--0.3 may join Cassiopeia A as a major source for understanding of CC processes and we expect this long observation to have archival value. [truncated! Please see actual data for full text]
DOI: 10.25549/examiner-c44-54911
title: Track repairmen (night jobs feature), 1953

description: 3 images. Track repairmen (night jobs feature), 16 August 1953. Joe Piedra (Welder); G. Gutierrez (helper). (Intersection of Pico Boulevard and South Hill Street).; Caption slip reads: "Feature. Photographer: Wyman. Date: 1953-08-14. Assignment: Track repairmen (These negs go with nite jobs feature, c/o Milt Harker). 43-44, 46: Welder Joe Piedra repairs worn spots & breaks in track joints. Behind him in one shot is his helper, G. Gutierrez. Intersection of Pico and Hill Streets. Cluster of lites in center uses trolley lines for power (for general illumination); power for the welding torch (spot welding) comes from a truck generator (not shown)
DOI: 10.57780/esa-xiohdzn
title: 090178

description: Superclusters as the largest cosmic structures are important to study the evolution of galaxy clusters and groups cosmic baryons (e.g. the warm hot intergalactic medium) and galaxy evolution. There have been few studies of superclusters in X-rays while the X-ray data remain as the key to study the bulk of baryons in superclusters. We select the two richest superclusters from the SDSS/redMaPPer cluster catalog and propose XMM observations to map both of them. They are extreme mass concentrations with the total mass at least several times higher than well-known superclusters like A901/2. The XMM data will be used to map the mass distribution (along with our weak-lensing work) study merger dynamics and examine the cosmic filaments and provide us important insights on superclusters. [truncated! Please see actual data for full text]
DOI: 10.25549/examiner-c44-109234
title: Spiegel divorce preliminary, 1954

description: 2 images. Spiegel divorce preliminary, 5 January 1954. Lynne Baggett Spiegel -- 28 years (actress). ; Caption slip reads: "Photographer: Gaze. Date: 1954-01-05. Reporter: Gaze. Assignment: Spiegel divorce prelim. 45-46: Actress Lynne Baggett Spiegel, 28, in Santa Monica superior court where her efforts to obtain temporary alimony from her motion picture producer husband continue. Story to come".