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after decades of observations the physical mechanisms that generate short gamma-ray bursts (sgrbs) still remain unclear. observational evidence provides support to the idea that sgrbs originate from the merger of compact binaries, consisting of two neutron stars (nss) or a ns and a black hole (bh). theoretical models a... | short gamma-ray bursts from binary neutron star mergers: the time-reversal scenario |
we introduce a distinct method for performing spatially resolved spectral analysis of astronomical sources with highly structured x-ray emission. the method measures the surface brightness of neighboring pixels to adaptively size and shape each region, thus the spectra from the bright and faint filamentary structures e... | feature-tailored spectroscopic analysis of the supernova remnant puppis a in x-rays |
we conduct a spectropolarimetric study of the accreting x-ray pulsar hercules x-1 using observations with the imaging x-ray polarimetry explorer (ixpe). ixpe monitored the source in three different epochs, sampling two "main-on" and one "short-on" state of the well-known super-orbital period of the source. we find that... | flux-resolved spectropolarimetric evolution of the x-ray pulsar hercules x-1 using ixpe |
in the modern era of abundant x-ray detections and the increasing momentum of gravitational waves astronomy, tests of general relativity in strong field regime become increasingly feasible and their importance for probing gravity cannot be understated. to this end, we study the characteristics of slowly rotating topolo... | slowly rotating topological neutron stars: universal relations and epicyclic frequencies |
using hundreds of xmm-newton and chandra archival observations and nearly a thousand rxte observations, we have generated a comprehensive library of the known pulsars in the small and large magellanic clouds (smc and lmc). the pulsars are detected multiple times across the full parameter spaces of x-ray luminosity (lx ... | a multi-observatory database of x-ray pulsars in the magellanic clouds |
one of the mainstreams in modern x-ray astronomy is research into extragalactic x-ray sources on the basis of the data acquired at the x-ray multi-mirror newton (xmm-newton) space observatory. according to observations, x-rays coming from galaxies are mainly radiated from their central regions, i.e., active galactic nu... | the xgal catalog of x-ray galaxies |
we show the lobster-eye (le) monitor's perspectives and observing plan based on a small le telescope on a small (cubesat-like) satellite platform. this instrument is important because it is able to provide wide-field x-ray imaging. we present the possibilities of monitoring the galactic center region in the soft x-ray ... | perspectives of the lobster-eye monitor in the soft x-ray observing the galactic center region |
starting from 1960s, a great number of missions and experiments have been performed for the study of the high-energy sky. this review gives a wide vision of the most important space missions and balloon experiments that have operated in the 10-600 kev band, a crucial window for the study of the most energetic and viole... | hard x-ray/soft gamma-ray experiments and missions: overview and prospects |
the antikythera mechanism, an ancient greek astronomical calculator, has challenged researchers since its discovery in 1901. now split into 82 fragments, only a third of the original survives, including 30 corroded bronze gearwheels. microfocus x-ray computed tomography (x-ray ct) in 2005 decoded the structure of the r... | a model of the cosmos in the ancient greek antikythera mechanism |
xipe, the x-ray imaging polarimetry explorer, is a mission dedicated to x-ray astronomy. at the time of writing xipe is in a competitive phase a as fourth medium size mission of esa (m4). it promises to reopen the polarimetry window in high energy astrophysics after more than 4 decades thanks to a detector that efficie... | xipe: the x-ray imaging polarimetry explorer |
bragg spectroscopy is one of the best established experimental methods for high energy resolution x-ray measurements and has been widely used in several fields, going from fundamental physics to quantum mechanics tests, synchrotron radiation and x-fel applications, astronomy, medicine and industry. however, this techni... | voxes: a high precision x-ray spectrometer for diffused sources with hapg crystals in the 2-20 kev range |
rich and poor galaxy clusters have the same measured halo metallicity, 0.35-0.4 z ⊙, even though they are an order of magnitude apart in stellar fraction, m */m gas. the measured intracluster medium (icm) metallicity in high-mass clusters cannot be explained by the visible stellar population as stars typically make up ... | the missing metal problem in galaxy clusters: characterizing the early enrichment population |
cadmium zinc telluride (czt) detectors have been the mainstay for hard x-ray astronomy for its high quantum efficiency, fine energy resolution, near room temperature operation, and radiation hardness. in order to fully utilize the spectroscopic capabilities of czt detectors, it is important to generate accurate respons... | line profile modelling for multi-pixel czt detectors |
the x-ray surveyor mission concept is unique among those being studied for prioritization in the nasa astrophysics 2020 decadal survey. the x-ray surveyor mission will explore the high-energy universe; providing essential and complimentary observations to the astronomy community. the nasa astrophysics roadmap (enduring... | the x-ray surveyor mission concept study: forging the path to nasa astrophysics 2020 decadal survey prioritization |
lenses, such as optical lens, electron lens, acoustic lens and so on, are devices that can focus waves to form an image. since the invention of telescopes and objectives, optical lenses play important roles in observing objects from molecular to astronomical levels, and high-resolution lithography using optical, electr... | achromatic metasurface lens at visible wavelengths |
a useful function, called group trigger, is implemented in a data acquisition system of a 240-pixel x-ray transition-edge sensor array to store simultaneous waveforms from any desired set of pixels. it works as a diagnostic tool which can record both primary pulses and associated crosstalk events with enough freedom to... | waveform analysis of a 240-pixel tes array for x-rays and charged particles using a function of triggering neighboring pixels |
we summarize a study of optical, uv and x-ray light curves of the nearby changing look active galactic nucleus in the galaxy ngc 1566 obtained with the neil gehrels swift observatory and the master global robotic network over the period 2007-2019. we also report on optical spectroscopy using the south african astronomi... | discovery of more changing look events in ngc 1566 |
the lynx x-ray observatory concept, under study for the 2020 nasa decadal survey, will require a telescope with ∼2 m2 of effective area and a point-spread function (psf) with ∼0.5-arc sec half-power diameter (hpd) to meet its science goals. this requires extremely accurate thin grazing-incidence mirrors with a reflecti... | simulations of film stress effects on mirror segments for the lynx x-ray observatory concept |
the biography of vladimir platonovich tsesevich (11.11.1907 - 28.10.1983), a leader of the astronomy in odessa from 1944 to 1983, is briefly reviewed, as well as the directions of study, mainly the highlights of the research of variable stars carried out by the members of the scientific school founded by him. the direc... | odessa scientific school of researchers of variable stars: from v.p.tsesevich (1907-1983) to our days |
flight model measurements of a porous plug phase separator and a film flow suppression system for the astro-h soft x-ray spectrometer dewar are described. astro-h is the sixth japanese astronomy satellite and will be launched in 2016. it carries the soft x-ray spectrometer consisting of an x-ray optic and an x-ray micr... | flight model measurements of the porous plug and film flow suppression system for the astro-h soft x-ray spectrometer dewar |
the soft γ-ray repeater (sgr) 0526-66 is the first-identified magnetar, and is projected within the supernova remnant n49 in the large magellanic cloud. based on our ∼50 ks nustar observation, we detect the quiescent-state 0526-66 for the first time in the 10-40 kev band. based on the joint analysis of our nustar and t... | nustar detection of quiescent hard x-ray emission from sgr 0526-66 in the large magellanic cloud |
x-rays and gamma-rays from astronomical sources such as solar flares are mostly absorbed by the earth's atmosphere. resulting electron-ion production rate as a function of height depends on the intensity and wavelength of the injected spectrum and therefore the effects vary from one source to another. in other words, t... | inverse problem in ionospheric science: prediction of solar soft-x-ray spectrum from very low frequency radiosonde results |
neutron star interior composition explorer (nicer) is a nasa instrument to be onboard international space station, which is equipped with 56 pairs of an x-ray concentrator (xrc) and a silicon drift detector for high timing observations. the xrc is based on an epoxy replicated thin aluminum foil x-ray mirror, similar to... | performance of nicer flight x-ray concentrator |
the nuclear equation of state (eos) plays an important role in understanding the formation of compact objects such as neutron stars and black holes. the true nature of the eos has been a matter of debate at any density range not only in nuclear physics but also in astronomy and astrophysics. we have constructed a datab... | eosdb: the database for nuclear equations of state* |
the gas pixel detector is a gas detector, sensitive to the polarization of x-rays, currently flying onboard the imaging x-ray polarimetry explorer (ixpe)-the first observatory dedicated to x-ray polarimetry. it detects x-rays and their polarization by imaging the ionization tracks generated by photoelectrons absorbed i... | equalizing the pixel response of the imaging photoelectric polarimeter onboard the ixpe mission |
v473 lyr is a classical cepheid that is unique in having substantial amplitude variations with a period of approximately 3.3 yr, thought to be similar to the blazhko variations in rr lyrae stars. we obtained an xmm-newton observation of this star to follow up a previous detection in x-rays. rather than the x-ray burst ... | x-ray observations of the peculiar cepheid v473 lyr identify a low-mass companion |
the broad energy response, low electronic read noise, and good energy resolution have made x-ray charge-coupled devices (ccds) an obvious choice for developing soft x-ray astronomical instruments over the last half-century. they also come in large array formats with small pixel sizes, which make them a potential candid... | development and characterization of a fast and low noise readout for the next generation x-ray charge-coupled devices |
we have computed obscured active galactic nuclei (agn) redshifts using the xz method, adopting a broad treatment in which we employed a wide-ranging data set and worked primarily at the xz counts sensitivity threshold, culminating with a redshift catalog containing 121 sources that lack documented redshifts. we conside... | x-ray redshifts of obscured chandra source catalog active galactic nuclei |
a dozen x-ray supernova shock breakout (sn sbo) candidates were reported recently based on xmm-newton archival data, which increased the x-ray-selected sn sbo sample by an order of magnitude. assuming that they are genuine sn sbos, we study the luminosity function (lf) by improving on the method used in our previous wo... | luminosity function and event rate density of xmm-newton-selected supernova shock breakout candidates |
a variety of statistical methods for understanding variability in the time domain for low count rate x-ray and gamma-ray sources are explored. variability can be detected using nonparametric (anderson-darling and overdispersion tests) and parametric (sequential likelihood-based tests) tools. once detected, variability ... | time domain methods for x-ray and gamma-ray astronomy |
the swift burst alert telescope (bat) is a coded-aperture gamma-ray instrument with a large field of view that primarily operates in survey mode when it is not triggering on transient events. the survey data consist of 80-channel detector plane histograms that accumulate photon counts over periods of at least 5 minutes... | batanalysis: a comprehensive python pipeline for swift bat survey analysis |
we present the identifications of a flux-limited sample of highly variable x-ray sources on long time-scales from the second catalogue of the xmm-newton slew survey (xmmsl2). the carefully constructed sample, comprising 265 sources (2.5 per cent) selected from the xmmsl2 clean catalogue, displayed x-ray variability of ... | populations of highly variable x-ray sources in the xmm-newton slew survey |
we present xmm-newton x-ray observations of nine confirmed lensed quasars at 1 ≲ z ≲ 3 identified by the gaia gravitational lens program. eight systems are strongly detected, with 0.3-8.0 kev fluxes f 0.3-8.0 ≳ 5 ×10-14 erg cm-2 s-1. modeling the x-ray spectra with an absorbed power law, we derive power-law photon indi... | gaia gral: gaia dr2 gravitational lens systems. vii. xmm-newton observations of lensed quasars |
the space-based multi-band astronomical variable objects monitor (svom) is a chinese - french satellite mission due to be launched in the summer of 2022. it is composed of four instruments: eclairs, for detecting x-ray and gamma-ray transients (4-250 kev); grm, a gamma-ray spectrometer (15 kev-5 mev); vt, a visible tel... | calibration of a fully populated lobster eye optic for svom |
we are entering a new era for high energy astrophysics with the use of new technology to increase our ability to both survey and monitor the sky. the soft x-ray imager (sxi) instrument on the theseus mission will revolutionize transient astronomy by using wide-field focusing optics to increase the sensitivity to fast t... | the soft x-ray imager on theseus: the transient high energy survey and early universe surveyor |
soft x-ray imaging is a new method used to observe the structure of the earth's magnetosphere. reconstruction of the earth's three-dimensional (3-d) magnetospheric structure from 2-d soft x-ray images is an important research topic in astronomical imaging and exploration. in this study, computed tomography (ct) is inve... | a 3d magnetospheric ct reconstruction method based on 3d gan and supplementary limited-angle 2d soft x-ray images |
we present the results of our analysis of the observations of the supernova remnant (snr) g18.1-0.1 performed with the erosita x-ray telescope onboard the srg observatory within the program of galactic ridge observations. we have constructed an image that entirely covers the surroundings of the snr located in the diffi... | morphology and spectra of the galactic supernova remnant g18.1-0.1 from srg/erosita data |
planets are known to grow out of a star-encircling disk of the gas and dust inherited from an interstellar cloud; their formation is thought to begin with coagulation of submicron dust grains into aggregates, the first foundational stage of planet formation. however, with nanoscale and submicron solids unobservable dir... | elementary composite binary and grain alignment locked in dust growth |
since the 1960s, x-ray astronomy has used space-based instruments to avoid the absorption of our atmosphere. x-rays are a short-wavelength type of radiation and carry large amounts of energies. they are thus tracers of hot, energetic, and violent phenomena in the universe. this chapter presents a brief history of the f... | x-ray astronomy |
large datasets are emerging in many fields of image processing including: electron microscopy, light microscopy, medical x-ray imaging, astronomy, etc. novel computer-controlled instrumentation facilitates the collection of very large datasets containing thousands of individual digital images. in single-particle cryoge... | a posteriori correction of camera characteristics from large image data sets |
we constrain the global parameters of the large magellanic cloud (lmc) by modeling the first soft x-ray (0.4-6.8 kev) observations of the entire lmc produced in a single pointing with moderate spectral resolution by the halosat cubesat. these data are best fit with the sum of two thermal plasma components in collisiona... | total x-ray emission from the lmc observed with halosat |
the multi-messenger observation of coalescing compact binary systems promises great scientific treasure. however, synthesising observations from both gravitational wave and electromagnetic channels remains challenging. in the context of the day-to-week long emission from a macronova, the binary neutron star merger gw17... | following up the afterglow: strategy for x-ray observation triggered by gravitational wave events |
alternative designs, arrangements and technologies for future astronomical x ray telescopes are presented and discussed. | alternative technologies and arrangements for future space x-ray telescopes |
astronomical imaging based on photon count data is a non-trivial task. in this context we show how to denoise, deconvolve, and decompose multi-domain photon observations. the primary objective is to incorporate accurate and well motivated likelihood and prior models in order to give reliable estimates about morphologic... | denoising, deconvolving, and decomposing multi-domain photon observations. the d4po algorithm |
ixpe, the imaging x-ray polarimetry explorer, has been selected as a nasa smex mission to be flown in 2021. it will perform polarimetry resolved in energy, in time and in angle as a break-through in high energy astrophysics. ixpe promises to 're-open', after 40 years, a window in x-ray astronomy adding two more observa... | ixpe the imaging x-ray polarimetry explorer |
the x-ray astronomy satellite astro-h are equipped with two equivalent soft x-ray telescopes (sxt-i and sxt-s) which cover the energy band 0.3{12 kev. the x-ray reflectors of the sxts are coated with a gold monolayer by means of the replication technique (okajima et al. in this volume). a series of gold m absorption ed... | reflectivity around the gold m-edges of x-ray reflector of the soft x-ray telescope onboard astro-h |
the space-based multi-band astronomical variable objects monitor (svom) is an approved satellite mission for gamma-ray burst (grb) studies, developed in cooperation between the chinese national space agency (cnsa), the chinese academy of sciences (cas), the french space agency (cnes) and french laboratories. svom enter... | the eclairs grb-trigger telescope on-board the future mission svom |
we report the quasi-simultaneous integral, swift, and nustar observations showing spectral state transitions in the neutron star low-mass x-ray binary 1rxs j180408.9-342058 during its 2015 outburst. we present results of the analysis of high-quality broad energy band (0.8-200 kev) data in three different spectral state... | quasi-simultaneous integral, swift, and nustar observations of the new x-ray clocked burster 1rxs j180408.9-342058 |
comptonization is a very important phenomenon in astrophysics. kompaneets equation describes up-comptonization process in nonrelativistic astrophysics, while it fails for down-comptonization scattering which is the most important radiative transfer process in hard x-rays and $\gamma$-rays astronomy. in this study, we e... | extend the kompaneets equation to down-comptonization process in a novel way |
we present an optical analysis of a sample of 11 clusters built from the excpres sample of x-ray selected clusters at intermediate redshift (z ~ 0.5). with a careful selection of the background galaxies, we provide the mass maps reconstructed from the weak lensing by the clusters. we compare them with the light distrib... | the matter distribution in z ~ 0.5 redshift clusters of galaxies. ii. the link between dark and visible matter |
context. observational data from x-ray binary systems provide strong evidence of astronomical objects that are too massive and compact to be explained as neutron or hybrid stars. when these systems are in the thermal (high/soft) state, they emit mainly in the 0.1-5 kev energy range. this emission can be explained by th... | magnetised accretion discs in kerr spacetimes |
we present results from modeling the broadband x-ray spectrum of the type 1 active galactic nucleus (agn) 2masx j193013.80+341049.5 using nustar, swift, and archival xmm-newton observations. we find this source to be highly x-ray obscured, with column densities exceeding 1023 cm-2 across all epochs of x-ray observation... | the broadband x-ray spectrum of the x-ray-obscured type 1 agn 2masx j193013.80+341049.5 |
context. the mass distribution in galaxy clusters and groups is an important cosmological probe. it has become clear in recent years that mass profiles are best recovered when combining complementary probes of the gravitational potential. strong lensing (sl) is very accurate in the inner regions, but other probes are r... | combining strong lensing and dynamics in galaxy clusters: integrating mamposst within lenstool. i. application on sl2s j02140-0535 |
the lightweight asymmetry and magnetism probe (lamp) is a micro-satellite mission concept dedicated for astronomical x-ray polarimetry and is currently under early phase study. it consists of segmented paraboloidal multilayer mirrors with a collecting area of about 1300 cm2 to reflect and focus 250 ev x-rays, which wil... | lamp: a micro-satellite based soft x-ray polarimeter for astrophysics |
labr3:ce crystals, with photomultiplier or single sipm readout (up to 3x3 mm$^2$) have been introduced for radiation imaging in medical physics. an r&d was pursued with 1/2" and 1" labr3:ce crystals, from different producers, to realize compact large area detectors (up to some cm $^2$ area) with sipm array readout,... | detection of low-energy x-rays with 1/2 and 1 inch labr3:ce crystals read by sipm arrays |
as building blocks of dust, rocky planets, and even complex life, the chemical elements heavier than hydrogen (h) and helium (he) - called "metals" in astronomy - play an essential role in our universe and its evolution. up to fe and ni, these metals are known to be created by stars and stellar remnants via nuclear fus... | chemical enrichment in groups and clusters |
soxs (son of x-shooter) will be a spectrograph for the eso ntt telescope capable to cover the optical and nir bands, based on the heritage of the x-shooter at the eso-vlt. soxs will be built and run by an international consortium, carrying out rapid and longer term target of opportunity requests on a variety of astrono... | soxs: a wide band spectrograph to follow up transients |
x-ray polarimetry in astronomy has not been exploited well, despite its importance. the recent innovation of instruments is changing this situation. we focus on a complementary metal-oxide-semiconductor (cmos) pixel detector with small pixel size and employ it as an x-ray photoelectron tracking polarimeter. the cmos de... | x-ray imaging polarimetry with a 2.5-μm pixel cmos sensor for visible light at room temperature |
we report the development of a high-time resolution, 3-colour, simultaneous optical imaging system for the 2.1 m telescope in the san pedro mártir observatory, méxico. opticam will be equipped with three 2,048×2,048 pixel andor zyla 4.2-plus scmos cameras and a set of sdss filters allowing optical coverage in the 320-1... | opticam: a triple-camera optical system designed to explore the fastest timescales in astronomy |
we characterize the relaxation state of galaxy systems by providing an assessment of the reliability of the photometric and spectroscopic probe via the semianalytic galaxy evolution model. we quantify the correlations between the dynamical age of simuglated galaxy groups and popular proxies of halo relaxation in observ... | on the reliability of photometric and spectroscopic tracers of halo relaxation |
the hot intracluster medium (icm) surrounding the heart of galaxy clusters is a complex medium that comprises various emitting components. although previous studies of nearby galaxy clusters, such as the perseus, the coma, or the virgo cluster, have demonstrated the need for multiple thermal components when spectroscop... | a novel machine learning approach to disentangle multitemperature regions in galaxy clusters |
we present updated measurements of the x-ray properties of the pulsar wind nebula associated with the tev γ-ray source hess j1640-465 derived from chandra and nuclear spectroscopic telescope array data. we report a high nhvalue along the line of sight, consistent with previous work, which led us to incorporate the effe... | broadband x-ray spectroscopy of the pulsar wind nebula in hess j1640-465 |
micro pore optical (mpo) device is a novel x-ray optical component with a unique 4 π solid-angle focusing capability and large effective area for specified weight ratio, which meet the requirements of the applications in modern x-ray astronomy. the focusing performance of flat mpo is a key factor affecting the detectio... | study on the optical properties of angel lobster eye x-ray flat micro pore optical device |
transition-edge sensors (tess) are capable of highly accurate single particle energy measurement. tess have been used for a wide range of photon detection applications, particularly in astronomy, but very little consideration has been given to their capabilities as electron calorimeters. existing electron spectrometers... | simulation method for investigating the use of transition-edge sensors as spectroscopic electron detectors |
this chapter describes the history, principles, and recent developments of large field of view x-ray optics based on lobster eye designs. most of grazing incidence (reflective) x-ray imaging systems used in astronomy and other applications, are based on the wolter 1 (or modified) arrangement. but there are also other d... | lobster eye x-ray optics |
the single-electron sensitive read out (sisero) is an on-chip charge detector output stage for charge-coupled device image sensors. developed at mit lincoln laboratory, this technology uses a p-mosfet transistor with a depleted internal gate beneath the transistor channel. the transistor source-drain current is modulat... | improved noise performance from the next-generation buried-channel p-mosfet siseros |
measuring time lags between time series or light curves at different wavelengths from a variable or transient source in astronomy is an essential probe of physical mechanisms causing multiwavelength variability. time lags are typically quantified using discrete correlation functions (dcfs), which are appropriate for li... | using mutual information to measure time lags from nonlinear processes in astronomy |
a puzzling variety of superorbital modulations has been discovered in several supergiant high mass x-ray binaries (sghmxbs). to investigate the mechanisms driving these superorbital modulations, we have analyzed long-term neil gehrels swift observatory (swift) burst alert telescope (bat) observations of three sghmxbs: ... | investigating the superorbital modulations in 4u 1909 + 07, igr j16418-4532, and igr j16479-4514 with swift xrt, bat, and nustar observations |
δ orionis is the closest massive multiple stellar system and one of the brightest members of the orion ob association. the primary (aa1) is a unique evolved o star. in this work, we applied a two-step disentangling method to a series of spectra in the blue region (430-450 nm), and we detected spectral lines of the seco... | spectrum of the secondary component and new orbital elements of the massive triple star δ ori a |
we investigate prospects for the detection of high-energy neutrinos produced in the prolonged jets of short gamma-ray bursts (sgrbs). the x-ray light curves of sgrbs show extended emission components lasting for 100-1000 s, which are considered to be produced by prolonged engine activity. jets produced by such activity... | high-energy neutrino emission associated with gravitational-wave signals: effects of cocoon photons and constraints on late-time emission |
vela x-1 is the archetypal eclipsing high-mass x-ray binary, composed of a neutron star (ns) accreting the b-star wind. it was observed by nearly all x-ray observatories, often multiple times, featuring a rich spectrum of variable emission lines. however, the precise origin of these lines in the binary system remains u... | a nicer viewing angle on the accretion stream of vela x-1 |
x-ray pulsar signals commonly have a very low amplitude and suffer from high observation noise and statistical correlation interference, which seriously degrade the signal detection performance given finite observation times. here, noise refers to the uncertainty distribution of the photon poisson statistics, and inter... | a feature representation method for x-ray pulsar signals based on cyclostationarity theory |
context. the isolated elliptical (ie) ngc 7796 is accompanied by an interesting early-type dwarf galaxy, named ngc 7796-dw1. it exhibits a tidal tail, very boxy isophotes, and multiple nuclei or regions (a, b, and c) that are bluer than the bulk population of the galaxy, indicating a younger age. these properties are s... | the curious case of the companion: evidence for cold accretion onto a dwarf satellite near the isolated elliptical ngc 7796⋆ |
beatrix (beam expander testing x-ray) is the x-ray facility under construction at the inaf-osservatorio astronomico brera (merate, italy) to prove that it is possible to perform the x-ray acceptance tests (psf and aeff) of the athena mirror modules at the required rate and with the required accuracy. the unique optical... | building the beatrix facility for the athena mirror modules x-ray testing |
off-plane x-ray reflection gratings are theoretically capable of achieving high resolution and high diffraction efficiencies over the soft x-ray bandpass, making them an ideal technology to implement on upcoming x-ray spectroscopy missions. to achieve high effective area, these gratings must be aligned into grating mod... | x-ray verification of an optically aligned off-plane grating module |
the data pipeline at the payload operation centre (poc) of the scanning sky monitor (ssm) onboard astrosat involves: (i) fetching the level-0 data from the indian space science data centre (issdc), (ii) level-0 to level-1 data processing followed by level-2 data generation, and (iii) transfer of the level-1 and level-2... | astrosat/ssm data pipeline |
leia (lobster eye imager for astronomy), also known as ep-wxt pathfinder, detected a new x-ray transient, named lxt 221227a, on december 27, 2022. the source position is r.a. = 147.454 deg, dec = 4.677 deg (j2000), with an uncertainty of 2.2 arcmin (radius, 90% c.l. statistical and systematic). | leia discovered an x-ray transient lxt 221227a |
we report on novel x-ray mirrors fabricated with a focused ion beam for future astronomical missions. we fabricated a test sample from a silicon wafer by forming six slits whose sidewalls were used as x-ray reflection surfaces. the six slits were designed with a size of 25 × 300 × 170 µm3 and with different inclination... | first demonstration of x-ray mirrors using focused ion beam |
the cooler system for the esa x-ray astronomical mission athena x-ifu instrument is being studied, and a demonstration cooling test has been performed by integrating the mechanical coolers (double-stage stirling cooler = 2st, 4k-class and 1k-class joule thomson coolers = 4k-jt and 2k-jt) provided by jaxa with the coole... | cooling performance of joule thomson coolers in 300 k -50 mk cryochain demonstration for athena x-ifu |
x-ray astronomy allows study of objects that may be associated with compact objects, i.e., neutron stars or black holes, and also may contain strong magnetic fields. such objects are categorically nonspherical, and likely noncircular when projected on the sky. polarization allows study of such geometric effects, and x-... | x-ray polarization from high-mass x-ray binaries |
the voxes project's goal is to realize the first prototype of a high resolution and high precision x-ray spectrometer for diffused sources, using highly annealed pyrolitic graphite (hapg) crystals combined with precision position detectors. the aim is to deliver a cost effective and easy to handle system having an ener... | voxes, a new high-resolution x-ray spectrometer for low yield measurements with diffused sources |
in the field of multi-messenger astronomy, bayesian inference is commonly adopted to compare the compatibility of models given the observed data. however, to describe a physical system like neutron star mergers and their associated gamma-ray burst (grb) events, usually more than ten physical parameters are incorporated... | a bayesian inference framework for gamma-ray burst afterglow properties |
instruments flown on cubesats are small. meaningful applications of cubesats in astronomical observations rely on the choice of a particular subject that is feasible for cubesats. here we report the result of a feasibility study for observing gamma-ray polarization from cygnus x-1 using a small compton polarimeter on b... | feasibility of observing gamma-ray polarization from cygnus x-1 using a cubesat |
measuring the polarization of the light coming from celestial sources provides a powerful tool to investigate their internal structure, as well as to study the physics at work in the emission processes. however, due to the technical challenges it presents, x-ray polarimetry is still quite undeveloped compared to other ... | the gas pixel detetcor for the ixpe mission |
the wide field imager (wfi) instrument is one of two complementary focal plane cameras on esa's next large class x-ray astronomy mission athena. it is coupled to a high performance x-ray mirror to provide an unprecedented survey power by combining a large field of view with an excellent count rate capability. the requi... | characterization of a 256 × 256 pixel depfet detector for the wfi of athena |
the astronomical röntgen telescope x-ray concentrator (art-xc) is a hard x-ray telescope with energy response up to 30 kev, to be launched on board the spectrum röntgen gamma (srg) spacecraft in 2018. art-xc consists of seven identical co-aligned mirror modules. each mirror assembly is coupled with a cdte double-sided ... | calibration of the art-xc mirror modules at msfc |
nasa's marshall space flight center (msfc) maintains an active research program toward the development of high-resolution, lightweight, grazing-incidence x-ray optics to serve the needs of future x-ray astronomy missions such as lynx. msfc development efforts include both direct fabrication (diamond turning and determi... | full-shell x-ray optics development at nasa marshall space flight center |
in order to advance significantly scientific objectives, future x-ray astronomy missions will likely call for x-ray telescopes with large aperture areas (≍ 3 m2) and fine angular resolution (≍ 12). achieving such performance is programmatically and technologically challenging due to the mass and envelope constraints of... | toward large-area sub-arcsecond x-ray telescopes ii |
for the first time in the history of ground-based x-ray astronomy, the on-axis performance of the dual mirror, aspheric, aplanatic schwarzschild-couder optical system has been demonstrated in a 9:7-m aperture imaging atmospheric cherenkov telescope. the novel design of the prototype schwarzschild-couder telescope (psct... | verification of the optical system of the 9.7-m prototype schwarzschild-couder telescope |
we report the discovery of a new cataclysmic variable dde 32 identified with the rosat x-ray source 1rxs j161935.7+524630 in draco. the variability was originally found by d. denisenko on the digitized palomar plates centered at the position of x-ray source. the photometric observations by f. martinelli at lajatico ast... | 1rxs j161935.7+524630: new polar with the varying accretion modes on two magnetic poles |
the resolution of a conventional imaging system based on first-order field correlation can be directly obtained from the optical transfer function. however, it is challenging to determine the resolution of an imaging system through random media, including imaging through scattering media and imaging through randomly in... | lensless wiener-khinchin telescope based on second-order spatial autocorrelation of thermal light |
x-ray silicon-on-insulator (soi) pixel sensors, "xrpix," are being developed for the next-generation x-ray astronomical satellite, "force." the xrpix is fabricated with the soi technology, which makes it possible to integrate a high-resistivity si sensor and a low-resistivity si complementary metal oxide semiconductor ... | proton radiation hardness of x-ray soi pixel sensors with pinned depleted diode structure |
the microchannel x-ray telescope (mxt) is an innovative compact x-ray instrument on board the svom astronomical mission dedicated to the study of transient phenomena such as gamma-ray bursts. during 3 weeks, we have tested the mxt flight model at the panter x-ray test facility under the nominal temperature and vacuum c... | spectral performance of the microchannel x-ray telescope on board the svom mission |
fifty years ago, borrowing an idea from our russian friends guseinov and zeldovich, we looked for very compact stars (neutron stars and black holes, in modern terminology) as optically-invisible components of single-line spectroscopic binaries. we didn't find any, but our method was very close to the processes that soo... | spectroscopic binaries and collapsed stars: part ii |
we summarize in this contribution the capabilities, design status, and the enabling technologies of the soft x-ray imager (sxi) planned to be on-board the theseus mission. we describe its central role in making theseus a powerful machine to probe the physical conditions of the early universe (close to the reionization ... | the soft x-ray imager (sxi) on-board the theseus mission |
the estimation of instrumental background is the basis of essentially all data analysis on observations with insight-hxmt. the current insight-hxmt/he background model made by liao et al. depends on the data from the he blind detector, i.e., using historical data to make a preliminary estimation of the background spect... | a parametric model to reproduce the background of the insight-hxmt/he blind detector |
astrosat is india's first space-based astronomical observatory, launched on september 28, 2015. one of the payloads aboard astrosat is the cadmium zinc telluride imager (czti), operating at hard x-rays. czti employs a two-dimensional coded aperture mask for the purpose of imaging. in this paper, we discuss various imag... | imaging calibration of astrosat cadmium zinc telluride imager (czti) |
hd 81817 is known as a hybrid star. hybrid stars have both cool stellar wind properties and ultraviolet (uv) or even x-ray emission features of highly ionized atoms in their spectra. a white dwarf companion has been suggested as the source of uv or x-ray features. hd 81817 has been observed since 2004 as a part of a ra... | hybrid star hd 81817 accompanied by brown dwarf or substellar companion |
a new γ-ray source with a significance level of approximately 5σ was reported in the region of the supernova remnant (snr) g272.2-3.2 by analyzing the approximately 12.4 yr of observation data from the fermi large area telescope. its γ-ray spatial distribution did not show an extended feature, and it had a soft spectru... | fermi-lat detection of gev γ-ray emission from the type ia supernova remnant g272.2-3.2 |
in pulsar astronomy, detecting effective pulsar signals among numerous pulsar candidates is an important research topic. starting from space x-ray pulsar signals, the two-dimensional autocorrelation profile map (2d-apm) feature modelling method, which utilizes epoch folding of the autocorrelation function of x-ray sign... | a method for pulsar searching: combining a two-dimensional autocorrelation profile map and a deep convolutional neural network |
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