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in a previous paper, we tried to test the kerr nature of the stellar-mass black hole in grs 1915+105 by analyzing nustar data of 2012 with our reflection model relxill_nk. we found that the choice of the intensity profile of the reflection component is crucial and eventually we were not able to get any constraint on th... | tests of the kerr hypothesis with grs 1915+105 using different relxill flavors |
we report the first detection of the x-ray polarization of the bright transient swift j1727.8-1613 with the imaging x-ray polarimetry explorer. the observation was performed at the beginning of the 2023 discovery outburst, when the source resided in the bright hard state. we find a time- and energy-averaged polarizatio... | discovery of x-ray polarization from the black hole transient swift j1727.8-1613 |
the imaging x-ray polarimetry explorer (ixpe) expands observation space by simultaneously adding polarization to the array of x-ray source properties currently measured (energy, time, and location). ixpe will thus open new dimensions for understanding how x-ray emission is produced in astrophysical objects, especially ... | the imaging x-ray polarimetry explorer (ixpe) |
astrosat, india's first dedicated astronomy space mission was launched on september 28, 2015. the large area x-ray proportional counter (laxpc) is one of the major payloads on astrosat. a cluster of three co-aligned identical laxpc detectors provide large area of collection .the large detection volume (15 cm depth) fil... | large area x-ray proportional counter (laxpc) instrument onboard astrosat |
jwst secondary eclipse observations of trappist-1b seemingly disfavor atmospheres >~1 bar since heat redistribution is expected to yield dayside emission temperature below the ~500 k observed. given the similar densities of trappist-1 planets, and the theoretical potential for atmospheric erosion around late m dwarf... | implications of atmospheric nondetections for trappist-1 inner planets on atmospheric retention prospects for outer planets |
multiplanet systems orbiting m dwarfs provide valuable tests of theories of small-planet formation and evolution. k2-3 is an early m dwarf hosting three small exoplanets (1.5-2.0 r ⊕) at distances of 0.07-0.20 au. we measure the high-energy spectrum of k2-3 with hst/cos and xmm-newton and use empirically driven estimat... | the k2-3 system revisited: testing photoevaporation and core-powered mass loss with three small planets spanning the radius valley |
thompson et al. (reports, 1 november 2019, p. 637) interpreted the unseen companion of the red giant star 2mass j05215658+4359220 as most likely a black hole. we argue that if the red giant’s mass is ~1 solar mass, its companion can be a close binary consisting of two main-sequence stars. this would explain why no x-ra... | comment on “a noninteracting low-mass black hole-giant star binary system” |
the detection of gev γ-ray emission from galactic novae by the fermi-large area telescope has become routine since 2010, and is generally associated with shocks internal to the nova ejecta. these shocks are also expected to heat plasma to ∼107 k, resulting in detectable x-ray emission. in this paper, we investigate 13 ... | surveying the x-ray behavior of novae as they emit γ-rays |
until now, the middle eocene has remained a poorly constrained interval of efforts to produce an astrochronological timescale for the entire cenozoic. this has given rise to a so-called "eocene astronomical timescale gap" (vandenberghe et al., 2012). a high-resolution astrochronological calibration for this interval ha... | towards a robust and consistent middle eocene astronomical timescale |
we reconstruct the two-dimensional (2d) matter distributions in 20 high-mass galaxy clusters selected from the clash survey by using the new approach of performing a joint weak gravitational lensing analysis of 2d shear and azimuthally averaged magnification measurements. this combination allows for a complete analysis... | the projected dark and baryonic ellipsoidal structure of 20 clash galaxy clusters |
we present the results from our 7 yr long broadband x-ray observing campaign of sn 2014c with chandra and nustar. these coordinated observations represent the first look at the evolution of a young extragalactic sn in the 0.3-80 kev energy range in the years after core collapse. we find that the spectroscopic metamorph... | seven years of coordinated chandra-nustar observations of sn 2014c unfold the extreme mass-loss history of its stellar progenitor |
we present an analysis of the relativistic reflection spectra of gx 339-4 during the hard-to-soft transition of its 2021 outburst observed by insight-hxmt. the strong relativistic reflection signatures in the data suggest a high black hole spin (a * > 0.86) and an intermediate disk inclination angle (i ≈ 35°-43°) of... | the hard-to-soft transition of gx 339-4 as seen by insight-hxmt |
several laboratory experiments have published limits on axionlike particles (alps) with feeble couplings to electrons and masses in the kilo-electron-volt to mega-electron-volt range, under the assumption that such alps comprise the dark matter. we note that alps decay radiatively into photons, and show that for a larg... | do direct detection experiments constrain axionlike particles coupled to electrons? |
the aim of this paper is to introduce the software and astronomical web-services developed in frame of the ukraine virtual observatory (ukrvo) and virtual roentgen and gamma observatory (virgo) to the broad astronomical community. we report briefly on such web-services as the public databases ``sky maps'' of x-ray obse... | ukrvo astroinformatics software and web-services |
we report on a multiband variability and correlation study of the tev blazar mrk 421 during an exceptional flaring activity observed from 2013 april 11 to 19. the study uses, among others, data from glast-agile support program (gasp) of the whole earth blazar telescope (webt), swift, nuclear spectroscopic telescope arr... | unraveling the complex behavior of mrk 421 with simultaneous x-ray and vhe observations during an extreme flaring activity in 2013 april |
at the end of the late paleozoic ice age (lpia) from late early permian to early late permian, the global climate was impacted by a prevailing megamonsoon and gondwanan deglaciation. to better understand the abiotic and biotic responses to milankovitch-forced climate changes during this time period, multi-element x-ray... | abiotic and biotic responses to milankovitch-forced megamonsoon and glacial cycles recorded in south china at the end of the late paleozoic ice age |
a crucial challenge to successful flare prediction is forecasting periods that transition between "flare-quiet" and "flare-active." building on earlier studies in this series in which we describe the methodology, details, and results of flare forecasting comparison efforts, we focus here on patterns of forecast outcome... | a comparison of flare forecasting methods. iv. evaluating consecutive-day forecasting patterns |
characterizing the atmospheres of planets orbiting m dwarfs requires understanding the spectral energy distributions of m dwarfs over planetary lifetimes. surveys like muscles, hazmat, and fumes have collected multiwavelength spectra across the spectral type's range of teff and activity, but the extreme ultraviolet (eu... | reconstructing the extreme ultraviolet emission of cool dwarfs using differential emission measure polynomials |
the cadmium zinc telluride imager (czti) on board astrosat has been regularly detecting gamma-ray bursts (grbs) since its launch in 2015. its sensitivity to polarization measurements at energies above 100 kev allows czti to attempt spectropolarimetric studies of grbs. here, we present the first catalog of grb polarizat... | hard x-ray polarization catalog for a five-year sample of gamma-ray bursts using astrosat czt imager |
pandora, plasmas for astrophysics, nuclear decays observation and radiation for archaeometry, is planned as a new facility based on a state-of-the-art plasma trap confining energetic plasma for performing interdisciplinary research in the fields of nuclear astrophysics, astrophysics, plasma physics and applications in ... | pandora, a new facility for interdisciplinary in-plasma physics |
extreme-ultraviolet and x-ray emission from stellar coronae drives mass loss from exoplanet atmospheres, and ultraviolet emission from stellar chromospheres drives photochemistry in exoplanet atmospheres. comparisons of the spectral energy distributions of host stars are, therefore, essential for understanding the evol... | the relative emission from chromospheres and coronae: dependence on spectral type and age |
after 26 yr in outburst, the black hole x-ray binary grs 1915+105 dimmed considerably in early 2018; its flux dropped sharply in mid-2019, and it has remained faint ever since. this faint period, the "obscured state," is punctuated by occasional x-ray flares, many of which have been observed by nicer as part of our reg... | a nicer view of a highly absorbed flare in grs 1915+105 |
the iron-line and continuum-fitting methods are currently the two leading techniques for measuring black-hole spins with electromagnetic radiation. they can be naturally extended for probing the spacetime geometry around black holes and testing general relativity in the strong field regime. in the past couple of years,... | testing general relativity with the stellar-mass black hole in lmc x-1 using the continuum-fitting method |
we present a weak-lensing analysis of the merging frontier fields (ff) cluster abell 2744 using new subaru/suprime-cam imaging. the wide-field lensing mass distribution reveals this cluster is comprised of four distinct substructures. simultaneously modeling the two-dimensional reduced shear field using a combination o... | frontier fields: subaru weak-lensing analysis of the merging galaxy cluster a2744 |
to expand traditional cyclostratigraphic numerical methods beyond their common technical limitations and apply them to truly deep-time archives, we need to reflect on the development of new approaches to sedimentary archives that are not traditionally targeted for cyclostratigraphic analysis but that frequently occur i... | cyclostratigraphy of the middle to upper ordovician successions of the armorican massif (western france) using portable x-ray fluorescence |
the hitomi (astro-h) mission is the sixth japanese x-ray astronomy satellite developed by a large international collaboration, including japan, usa, canada, and europe. the mission aimed to provide the highest energy resolution ever achieved at e > 2 kev, using a microcalorimeter instrument, and to cover a wide ener... | the astro-h (hitomi) x-ray astronomy satellite |
we present a new simulation framework, based on the python programming language and specifically developed for the imaging x-ray polarimetry explorer (ixpe) mission. starting from an arbitrary source model (including morphological, temporal, spectral and polarimetric information), this framework uses the instrument res... | an observation-simulation and analysis framework for the imaging x-ray polarimetry explorer (ixpe) |
we present the results of a model-based search for continuous gravitational waves from the low-mass x-ray binary scorpius x-1 using ligo detector data from the third observing run of advanced ligo and advanced virgo. this is a semicoherent search that uses details of the signal model to coherently combine data separate... | model-based cross-correlation search for gravitational waves from the low-mass x-ray binary scorpius x-1 in ligo o3 data |
few astronomically calibrated high-resolution (≤5 kyr) climate records exist that span the oligocene-miocene time interval. notably, available proxy records show responses varying in amplitude at frequencies related to astronomical forcing, and the main pacemakers of global change on astronomical time-scales remain deb... | cyclostratigraphy and eccentricity tuning of the early oligocene through early miocene (30.1-17.1 ma): cibicides mundulus stable oxygen and carbon isotope records from walvis ridge site 1264 |
type-i x-ray bursts can be used to determine properties of accreting neutron stars via comparisons between model calculations and astronomical observations, exploiting the sensitivity of models to astrophysical conditions. however, the sensitivity of models to nuclear physics uncertainties calls into question the fidel... | influence of nuclear reaction rate uncertainties on neutron star properties extracted from x-ray burst model-observation comparisons |
until recently, black holes (bhs) could be discovered only through accretion from other stars in x-ray binaries, or in merging double compact objects. improvements in astrometric and spectroscopic measurements have made it possible to detect bhs also in noninteracting bh binaries (nbhbs) through a precise analysis of t... | noninteracting black hole binaries with gaia and lamost |
phase retrieval, the problem of recovering lost phase information from measured intensity alone, is an inverse problem that is widely faced in various imaging modalities ranging from astronomy to nanoscale imaging. the current process of phase recovery is iterative in nature. as a result, the image formation is time co... | rapid 3d nanoscale coherent imaging via physics-aware deep learning |
we constrain the intrinsic eddington ratio (λ edd) distribution function for local active galactic nuclei (agn) in bins of low and high obscuration $[\mathrm{log}({n}_{{\rm{h}}}/{\mathrm{cm}}^{-2})\leqslant 22$ and $22\lt \mathrm{log}({n}_{{\rm{h}}}/{\mathrm{cm}}^{-2})\lt 25$ ], using the swift burst alert telescope 70... | probing the structure and evolution of bass active galactic nuclei through eddington ratios |
we show how observations of gravitational waves from binary neutron star (bns) mergers over the next few years can be combined with insights from nuclear physics to obtain useful constraints on the equation of state (eos) of dense matter. in particular, the neutron-matter eos between 1 and 2 times the nuclear saturatio... | constraining the neutron-matter equation of state with gravitational waves |
we perform a three-dimensional multi-probe analysis of the rich galaxy cluster a1689, one of the most powerful known lenses on the sky, by combining improved weak-lensing data from new wide-field {{bvr}}ci\prime z\prime subaru/suprime-cam observations with strong-lensing, x-ray, and sunyaev-zel’dovich effect (sze) data... | three-dimensional multi-probe analysis of the galaxy cluster a1689 |
the nasa/asi imaging x-ray polarimetry explorer, which will be launched in 2021, will be the first instrument to perform spatially resolved x-ray polarimetry on several astronomical sources in the 2- to 8-kev energy band. these measurements are made possible owing to the use of a gas pixel detector (gpd) at the focus o... | in-flight calibration system of imaging x-ray polarimetry explorer |
x-ray bursts are among the brightest stellar objects frequently observed in the sky by space-based telescopes. a type-i x-ray burst is understood as a violent thermonuclear explosion on the surface of a neutron star, accreting matter from a companion star in a binary system. the bursts are powered by a nuclear reaction... | mass measurements show slowdown of rapid proton capture process at waiting-point nucleus 64ge |
we present results from a 100 ks xmm-newton observation of galaxy cluster xlssc 122, the first massive cluster discovered through its x-ray emission at z ≈ 2. the data provide the first precise constraints on the bulk thermodynamic properties of such a distant cluster, as well as an x-ray spectroscopic confirmation of ... | the xxl survey. xvii. x-ray and sunyaev-zel'dovich properties of the redshift 2.0 galaxy cluster xlssc 122 |
we analyze seven neutron star interior composition interior explorer (nicer) and nuclear spectroscopic telescope array epochs of the black hole x-ray binary gx 339-4 in the hard state during its two most recent hard-only outbursts in 2017 and 2019. these observations cover the 1-100 kev unabsorbed luminosities between ... | relativistic reflection and reverberation in gx 339-4 with nicer and nustar |
we present a deep xmm-newton observation of the galactic halo emission in the direction of the blazar 1es 1553+113. in order to extract the galactic halo component from the diffuse soft x-ray emission spectrum, accurately modeling the foreground components is crucial. here we present complex modeling of the foregrounds... | multiple temperature components of the hot circumgalactic medium of the milky way |
we present a comprehensive search for the 3.5 kev line using ∼51 ms of archival chandra observations peering through the milky way's dark matter halo from across the entirety of the sky, gathered via the chandra source catalog release 2.0. we consider the data's radial distribution, organizing observations into four da... | probing the milky way's dark matter halo for the 3.5 kev line |
aims: open universe for blazars is a set of high-transparency multi-frequency data products for blazar science, and the tools designed to generate them. blazars are drawing growing interest following the consolidation of their position as the most abundant type of source in the extragalactic very high-energy γ-ray sky,... | open universe for blazars: a new generation of astronomical products based on 14 years of swift-xrt data |
we present the results of a joint analysis of chandra x-ray and south pole telescope (spt) sunyaev-zel'dovich (sz) observations targeting the first sample of galaxy clusters at 0.3 < z < 1.3, selected to be the progenitors of well-studied nearby clusters based on their expected accretion rate. we develop a new pr... | stability of cool cores during galaxy cluster growth: a joint chandra/spt analysis of 67 galaxy clusters along a common evolutionary track spanning 9 gyr |
the high energy cosmic radiation detector (herd) is a prominent space-borne instrument to be installed on-board the chinese space station (css) around 2027, resulting from a collaboration among chinese and european institutions. primary scientific goals of herd include: precise measurements of the cosmic ray (cr) energ... | overview of the herd space mission |
the on-going x-ray all-sky survey with the erosita instrument will yield large galaxy cluster samples, which will bring strong constraints on cosmological parameters. in particular, the survey holds great promise to investigate the tension between cmb and low-redshift measurements. the current bottleneck preventing the... | low-scatter galaxy cluster mass proxies for the erosita all-sky survey |
when a gamma-ray burst (grb) emitter stops emission abruptly, the observer receives rapidly fading emission from high latitudes with respect to the line of sight, known as the "curvature effect." identifying such emission from grb prompt-emission lightcurves would constrain the radius of prompt emission from the centra... | testing the high-latitude curvature effect of gamma-ray bursts with fermi data: evidence of bulk acceleration in prompt emission |
m-dwarf stars are prime targets for exoplanet searches because of their close proximity and favorable properties for both planet detection and characterization. however, the potential habitability and atmospheric characterization of these exoplanetary systems depends critically on the history of high-energy stellar rad... | the far ultraviolet m-dwarf evolution survey. i. the rotational evolution of high-energy emissions |
we report the detection of a rapid occultation event in the nearby seyfert galaxy ngc 6814, simultaneously captured in a transient light curve and spectral variability. the intensity and hardness ratio curves capture distinct ingress and egress periods that are symmetric in duration. independent of the selected continu... | eclipsing the x-ray emitting region in the active galaxy ngc 6814 |
we report on proper motion measurements of the forward- and reverse shock regions of the supernova remnant cassiopeia a (cas a), including deceleration/acceleration measurements of the forward shock. the measurements combine 19 yr of observations with the chandra x-ray observatory, using the 4.2-6 kev continuum band, p... | the forward and reverse shock dynamics of cassiopeia a |
we combine the santa cruz semianalytic model (sam) for galaxy formation and evolution with the circumgalactic medium (cgm) model presented in faerman et al. to explore the cgm properties of l * galaxies. we use the sam to generate a sample of galaxies with halo masses similar to the milky way (mw) halo, m vir ≈ 1012 m ... | exploring the milky way circumgalactic medium in a cosmological context with a semianalytic model |
we present a new, ambitious survey performed with the chandra x-ray observatory of the 9.3 deg2 boötes field of the noao deep wide-field survey. the wide field probes a statistically representative volume of the universe at high redshift. the chandra deep wide-field survey exploits the excellent sensitivity and angular... | the chandra deep wide-field survey: a new chandra legacy survey in the boötes field. i. x-ray point source catalog, number counts, and multiwavelength counterparts |
active galactic nuclei (agn) are powerful astronomical objects with very high luminosities. theoretical arguments suggest that these objects are capable of accelerating particles to energies of 10$^{20}$ ev. in environments with matter or photon targets, cosmic-ray interactions transpire leading to the production of pi... | search for high-energy neutrino emission from hard x-ray agn with icecube |
we present a strong-lensing analysis of the cluster psz1 g311.65-18.48, based on hubble space telescope imaging, archival vlt/muse spectroscopy, and chandra x-ray data. this cool-core cluster (z = 0.443) lenses the brightest lensed galaxy known, dubbed the "sunburst arc" (z = 2.3703), a lyman continuum (lyc) emitting g... | the cosmic telescope that lenses the sunburst arc, psz1 g311.65-18.48: strong gravitational lensing model and source plane analysis |
labr3:ce crystals have good scintillation properties for x-ray spectroscopy. initially, they were introduced for radiation imaging in medical physics with either a photomultiplier or sipm readout, and they found extensive applications in homeland security and gamma-ray astronomy. we used 1″ round labr3:ce crystals to r... | improving the time resolution of large-area labr3:ce detectors with sipm array readout |
theoretical models indicate that photoevaporative and magnetothermal winds play a crucial role in the evolution and dispersal of protoplanetary disks and affect the formation of planetary systems. however, it is still unclear what wind-driving mechanism is dominant or if both are at work, perhaps at different stages of... | high-resolution [o i] line spectral mapping of tw hya consistent with x-ray-driven photoevaporation |
galactic outflows from local starburst galaxies typically exhibit a layered geometry, with cool 104 k flow sheathing a hotter 107 k, cylindrically collimated, x-ray-emitting plasma. here we argue that winds driven by energy injection in a ring-like geometry can produce this distinctive large-scale multiphase morphology... | galactic winds and bubbles from nuclear starburst rings |
this book describes the rich and diverse realm of accreting binary systems, made up of a compact object such as a white dwarf, neutron star or black hole, orbiting a companion star. it details the nature, formation and evolution of accreting binaries, describing how extensive observations, accompanied by simulations, a... | accreting binaries; nature, formation, and evolution |
context. the flight calibration of the spectral response of charge-coupled device (ccd) instruments below 1.5 kev is difficult in general because of the lack of strong lines in the on-board calibration sources typically available. this calibration is also a function of time due to the effects of radiation damage on the... | snr 1e 0102.2-7219 as an x-ray calibration standard in the 0.5-1.0 kev bandpass and its application to the ccd instruments aboard chandra, suzaku, swift and xmm-newton |
insight-hxmt is the first chinese x-ray astronomical mission. with a 1-250 kev bandpass, an energy resolution of 150 ev at 6 kev, and without being subject to pile-up distortions, it is suitable to study bright x-ray sources like galactic black holes. in this paper, we study insight-hxmt observations of the x-ray binar... | the spins of the galactic black holes in maxi j1535-571 and 4u 1630-472 from insight-hxmt |
this paper presents a novel full-depletion si x-ray detector based on silicon-on-insulator pixel (soipix) technology using a pinned depleted diode structure, named the soipix-pdd. the soipix-pdd greatly reduces stray capacitance at the charge sensing node, the dark current of the detector, and capacitive coupling betwe... | a low-noise x-ray astronomical silicon-on-insulator pixel detector using a pinned depleted diode structure |
we describe an optimal signal extraction process for imaging x-ray polarimetry using an ensemble of deep neural networks. the initial photoelectron angle, used to recover the polarization, has errors following a von mises distribution. this is complicated by events converting outside of the fiducial gas volume, whose t... | toward optimal signal extraction for imaging x-ray polarimetry |
the nuclear spectroscopic telescope array (nustar) mission is the first focusing x-ray telescope in the hard x-ray (3-79 kev) band. among the phenomena that can be studied in this energy band, some require high time resolution and stability: rotation-powered and accreting millisecond pulsars, fast variability from blac... | timing calibration of the nustar x-ray telescope |
mascara-4 b is a hot jupiter in a highly misaligned orbit around a rapidly rotating a3v star that was observed for 54 days by the transiting exoplanet survey satellite (tess). we perform two analyses of mascara-4 b using a stellar gravity-darkened model. first, we measure mascara-4 b’s misaligned orbital configuration ... | gravity-darkening analysis of the misaligned hot jupiter mascara-4 b |
the nearby elliptical galaxy centaurus a (cen a) is surrounded by a flattened system of dwarf satellite galaxies with coherent motions. using a novel bayesian approach, we measured the mean rotation velocity vrot and velocity dispersion σint of the satellite system. we found vrot/σint ≃ 0.7, indicating that the satelli... | the cen a galaxy group: dynamical mass and missing baryons |
this paper presents the construction of the rapidxmm database that is available through the xmm-newton science archive and offers access to upper limits and aperture photometry across the field of view of the xmm-newton pointed and slew survey observations. the feature of rapidxmm is speed. it enables the fast retrieva... | the rapidxmm upper limit server: x-ray aperture photometry of the xmm-newton archival observations |
using the photon-ion merged-beams technique at a synchrotron light source, we have measured relative cross sections for single and up to five-fold photoionization of fe2+ ions in the energy range of 690-920 ev. this range contains thresholds and resonances associated with ionization and excitation of 2p and 2s electron... | near l-edge single and multiple photoionization of doubly charged iron ions |
one of the most enduring and intensively studied problems of x-ray astronomy is the disagreement of state-of-the art theory and observations for the intensity ratio of two fe xvii transitions of crucial value for plasma diagnostics, dubbed 3 c and 3 d . we unravel this conundrum at the petra iii synchrotron facility by... | new measurement resolves key astrophysical fe xvii oscillator strength problem |
x-ray polarimetry is largely an unexplored area of an otherwise mature field of x-ray astronomy. except for a few early attempts during the 1970s, no dedicated x-ray polarimeter has been flown during the past four decades. on the other hand, the scientific value of x-ray polarization measurement has been well known for... | hard x-ray polarimetry with astrosat-czti |
tidal disruption events (tdes) offer a unique opportunity to study a single supermassive black hole (smbh) under feeding conditions that change over timescales of days to months. however, the primary mechanism for generating luminosity during the flares remains debated. despite the increasing number of observed tdes, i... | an energy inventory of tidal disruption events |
we report significant hard x-ray excesses in the energy range 2-8 kev for two nearby isolated neutron stars: rx j1856.6-3754 and rx j0420.0-5022. these neutron stars have previously been observed in soft x-rays to have nearly thermal spectra at temperatures ∼100 ev, which are thought to arise from the warm neutron star... | hard x-ray excess from the magnificent seven neutron stars |
the transiting exoplanet survey satellite (tess) mission has enabled discoveries of the brightest transiting planet systems around young stars. these systems are the benchmarks for testing theories of planetary evolution. we report the discovery of a mini-neptune transiting a bright star in the ab doradus moving group.... | a mini-neptune from tess and cheops around the 120 myr old ab dor member hip 94235 |
we present an overview of the main agile data center activities and architecture. agile is a space mission of the italian space agency (asi) in joint collaboration with inaf, infn, cifs, and with the participation of several italian space industry companies. the agile satellite was launched on april 23, 2007, and is de... | the agile data center and its legacy |
depending on the stellar type, more than 15% of stars in the field have at least two stellar companions. hierarchical triple systems can be assembled dynamically in dense star clusters, as a result of few-body encounters among stars and/or compact remnants in the cluster core. in this paper, we present the demographics... | demographics of triple systems in dense star clusters |
intermediate-mass black holes (imbhs) have not been detected beyond any reasonable doubt, despite their potential role as massive seeds for quasars and sources of tidal disruption events, ultraluminous x-ray sources, dwarf galaxy feedback, and hypervelocity stars. gravitational wave (gw) observations can help to find a... | gravitational-wave captures by intermediate-mass black holes in galactic nuclei |
the number of baryons hosted in the disks of galaxies is lower than expected based on the mass of their dark matter halos and the fraction of baryon-to-total matter in the universe, giving rise to the so-called galaxy missing-baryon problem. the presence of cool circumgalactic matter gravitationally bound to its galaxy... | x-ray detection of the galaxy's missing baryons in the circumgalactic medium of l* galaxies |
the hot universe baryon surveyor (hubs) mission is proposed to study "missing" baryons in the universe. unlike dark matter, baryonic matter is made of elements in the periodic table, and can be directly observed through the electromagnetic signals that it produces. stars contain only a tiny fraction of the baryonic mat... | hubs: a dedicated hot circumgalactic medium explorer |
we present the direct detection of the splashback feature using the sample of massive galaxy clusters from the local cluster substructure survey (locuss). this feature is clearly detected (above 5σ) in the stacked luminosity density profile obtained using the k-band magnitudes of spectroscopically confirmed cluster mem... | locuss: the splashback radius of massive galaxy clusters and its dependence on cluster merger history |
the chang'e 3 (ce-3) mission was implemented as the first lander/rover mission of the chinese lunar exploration program (clep). after its successful launch at 01:30 local time on december 2, 2013, ce-3 was inserted into an eccentric polar lunar orbit on december 6, and landed to the east of a 430 m crater in northweste... | the chang'e 3 mission overview |
binary systems with a neutron-star primary accreting from a companion star display variability in the x-ray band on time scales ranging from years to milliseconds. with frequencies of up to ∼1300 hz, the kilohertz quasi-periodic oscillations (khz qpos) represent the fastest variability observed from any astronomical ob... | high-frequency variability in neutron-star low-mass x-ray binaries |
we present deep chandra observations of pso j231.6576-20.8335, a quasar at redshift z = 6.59 with a nearby (∼8 proper kpc) companion galaxy. the atacama large millimeter/submillimeter array observed both the quasar and companion to be bright in [c ii], and the system has significant extended lyα emission around the qua... | x-ray observations of a [c ii]-bright, z = 6.59 quasar/companion system |
we present an analysis of 10 ks snapshot chandra observations of 12 shocked post-starburst galaxies, which provide a window into the unresolved question of active galactic nuclei (agn) activity in post-starburst galaxies and its role in the transition of galaxies from active star formation to quiescence. while seven of... | are active galactic nuclei in post-starburst galaxies driving the change or along for the ride? |
the pulse radiation detectors are sorely needed in the fields of nuclear reaction monitoring, material analysis, astronomy study, spacecraft navigation, and space communication. in this work, we demonstrate a nanosecond x-ray detector based on zno single crystal semiconductor, which emerges as a promising compound-semi... | nanosecond x-ray detector based on high resistivity zno single crystal semiconductor |
we present nptfit, an open-source code package, written in python and cython, for performing non-poissonian template fits (nptfs). the nptf is a recently developed statistical procedure for characterizing the contribution of unresolved point sources (pss) to astrophysical data sets. the nptf was first applied to fermi ... | nptfit: a code package for non-poissonian template fitting |
the circumgalactic medium (cgm) plays a crucial role in galaxy evolution as it fuels star formation, retains metals ejected from the galaxies, and hosts gas flows in and out of galaxies. for milky way-type and more-massive galaxies, the bulk of the cgm is in hot phases best accessible at x-ray wavelengths. however, our... | circumgalactic medium on the largest scales: detecting x-ray absorption lines with large-area microcalorimeters |
we present an analysis of 745.8 ks of archival chandra x-ray observatory advanced ccd imaging spectrometer data accumulated between 2000 and 2016 of the millisecond pulsar (msp) population in the rich galactic globular cluster terzan 5. eight of the 38 msps with precise positions are found to have plausible x-ray sourc... | a deep chandra x-ray observatory study of the millisecond pulsar population in the globular cluster terzan 5 |
we present new xmm-newton observations extending the mosaic of the perseus cluster out to the virial radius to the west. previous studies with rosat have reported a large excess in surface brightness to the west, possibly the result of large-scale gas sloshing. in our new xmm-newton observations we have found two x-ray... | is there an enormous cold front at the virial radius of the perseus cluster? |
we have been developing event driven x-ray silicon-on-insulator (soi) pixel sensors, called "xrpix", for the next generation of x-ray astronomy satellites. xrpix is a monolithic active pixel sensor, fabricated using the soi cmos technology, and is equipped with the so-called "event-driven readout", which allows reading... | performance of the silicon-on-insulator pixel sensor for x-ray astronomy, xrpix6e, equipped with pinned depleted diode structure |
for a track based polarimeter, such as the imaging x-ray polarimetry explorer (ixpe), the sensitivity to polarization depends on the modulation factor, which is a strong function of energy. in previous work, a likelihood method was developed that would account for this variation in order to estimate the minimum detecta... | analysis of polarimetry data with angular uncertainties |
we present halosat x-ray observations of the entirety of the bright x-ray emitting feature known as the north polar spur (nps). the large field of view of halosat enabled coverage of the entire bright nps in only 14 fields, which were each observed for ≈30,000 s. we find that the nps fields are distinct in both brightn... | an analysis of the north polar spur using halosat |
the ligo's discovery of binary black hole mergers has opened up a new era of transient gravitational wave astronomy. the potential detection of gravitational radiation from another class of astronomical objects, rapidly spinning nonaxisymmetric neutron stars, would constitute a new area of gravitational wave astronomy.... | accretion-induced spin-wandering effects on the neutron star in scorpius x-1: implications for continuous gravitational wave searches |
hard x-ray astronomical observatories in orbit suffer from a significant amount of background due to radioactivation induced by cosmic-ray protons and/or geomagnetically trapped protons. within the framework of a full monte carlo simulation, we present modeling of in-orbit instrumental background which is dominated by ... | modeling of proton-induced radioactivation background in hard x-ray telescopes: geant4-based simulation and its demonstration by hitomi's measurement in a low earth orbit |
in recent years, significant progress has been made on complementary metal oxide semiconductor (cmos) devices, which have been proposed as x-ray imaging spectroscopes for future space astronomy missions. we tested a newly developed backside-illuminated scientific cmos (bsi scmos) device, which is treated as a soft x-ra... | characterization of a bsi scmos for soft x-ray imaging spectroscopy |
we present an analysis of the effects of uncertainties in the atmosphere models on the radius, mass, and other neutron star parameter constraints for the nicer observations of rotation-powered millisecond pulsars. to date, nicer has applied the x-ray pulse profile modeling technique to two millisecond-period pulsars: p... | atmospheric effects on neutron star parameter constraints with nicer |
we explain both the observation of dark matter by the seasonal variation of the dama-libra data and the observation of ``electron recoil'' events at xenon1t by the same dark matter model. this dm is bubbles of a new type of vacuum containing ordinary atomic matter under high pressure ensured by the surface tension of t... | atomic size dark matter pearls, electron signal |
dust can play an important role in shaping the x-ray spectra and images of astrophysical sources. in this work we report on the implementation of dust in the ray-tracing platform reflex. we illustrate the different effects associated with the interaction between x-ray photons and dust grains, such as dust scattering, n... | ray-tracing simulations and spectral models of x-ray radiation in dusty media |
we have combined x-ray observations from chandra with sunyaev-zel'dovich effect data from planck and bolocam to measure intracluster medium pressure profiles from 0.03 r 500 ≤ r ≤ 5 r 500 for a sample of 21 low-z galaxy clusters with a median redshift of <z> = 0.08 and a median mass of <m 500> = 6.1 × 1014 ... | the evolution and mass dependence of galaxy cluster pressure profiles at 0.05 ≤ z ≤ 0.60 and 4 × 1014 m ⊙ ≤ m 500 ≤ 30 × 1014 m ⊙ |
in recent years, scientific cmos (scmos) sensors have found increasing applications to x-ray detection, including xray astronomical observations. in order to examine the performance of scmos sensors, we have developed x-ray cameras based on scmos sensors. two cameras, cnx22 and cnx 66, have been developed using scmos s... | design and test results of scientific x-ray cmos cameras |
a monolithic cmos image sensor based on the pinned photodiode (ppd) and optimized for x-ray imaging in the 300 ev to 5 kev energy range is described. featuring 40 μm square pixels and 40 μm thick, high resistivity epitaxial silicon, the sensor is fully depleted by reverse substrate bias. backside illumination (bsi) pro... | a cmos image sensor for soft x-ray astronomy |
the advent of gravitational wave (gw) astronomy has provided us with observations of black holes more massive than those known from x-ray astronomy. however, the observation of an intermediate-mass black hole (imbh) remains a big challenge. after their second observing run, the ligo & virgo scientific collaboration... | numerical relativity injection analysis of signals from generically spinning intermediate mass black hole binaries in advanced ligo data |
context. consistent modeling of protoplanetary disks requires the simultaneous solution of both continuum and line radiative transfer, heating and cooling balance between dust and gas and, of course, chemistry. such models depend on panchromatic observations that can provide a complete description of the physical and c... | consistent dust and gas models for protoplanetary disks. iv. a panchromatic view of protoplanetary disks |
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