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leia (lobster eye imager for astronomy), also known as ep-wxt pathfinder, detected a new x-ray transient on november 07, 2022. the source position is r.a. = 91.02 deg, dec = 12.76 deg (j2000) with an uncertainty of 3 arcmin (radius, 90% c.l. statistical and systematic). | leia discovered an x-ray transient lxt 221107a |
markarian (mrk) 180 is a bl lacertae object located at a redshift of 0.045 and is a potential candidate for high-energy cosmic-ray acceleration. we have analyzed the fermi large area telescope (fermi-lat) γ-ray data of mrk 180 collected over a period of 12.8 yr and found no significant enhancement in the flux from the ... | exploring the emission mechanisms of mrk 180 with long-term x-ray and γ-ray data |
the flight of the micro-x sounding rocket on july 22, 2018, marked the first operation of transition-edge sensors and their superconducting quantum interference device readouts in space. the instrument combines the microcalorimeter array with an imaging mirror to take high-resolution spectra from extended x-ray sources... | first flight performance of the micro-x microcalorimeter x-ray sounding rocket |
the astro-h satellite is the 6th japanese x-ray astronomical observatory to be launched in early 2016. the satellite carries four kinds of detectors, and one of them is an x-ray ccd camera, the soft x-ray imager (sxi), installed on the focal plane of an x-ray telescope. the sxi contains four ccd chips, each with an ima... | modeling the spectral response for the soft x-ray imager onboard the astro-h satellite |
the capability of an x-ray telescope depends on the quality of its mirror, which can be characterized by four quantities: point-spread-function, photon-collecting area, field of view, and energy bandwidth. in this paper, we report on our effort of developing an x-ray mirror technology that advances all of those four qu... | next generation x-ray optics for astronomy: high resolution, lightweight, and low cost |
x-ray astronomy critically depends on x-ray optics. the capability of an x-ray telescope is largely determined by the point-spread function (psf) and the photon-collection area of its mirrors, the same as telescopes in other wavelength bands. since an x-ray telescope must be operated above the atmosphere in space and t... | astronomical x-ray optics using mono-crystalline silicon: high resolution, light weight, and low cost |
sensors that are based on active pixels enable a flexible adaption to the needs of a scientific instrument. the depfet,∗ a p-channel field effect transistor implemented on a fully depleted silicon bulk, contains a so-called internal gate that serves as potential minimum for collected charge carriers generated by incide... | recent improvements on high-speed depfet detectors for x-ray astronomy |
over the past two decades, both x-ray and gamma-ray astronomy have experienced great progress. however, the region of the electromagnetic spectrum around ∼1 mev is not so thoroughly explored. future medium-sized gamma-ray telescopes will fill this gap in observations. as the timescale for the development and launch of ... | scientific performance of a nano-satellite mev telescope |
kidspec, the kinetic inductance detector spectrograph, is a concept for a highly sensitive, medium-spectral-resolution optical through near-ir spectrograph. it uses the intrinsic-energy-resolving capability of an array of optical/ir-sensitive mkids to distinguish multiple orders from a low-resolution grating. by acting... | kidspec: an mkid-based medium-resolution, integral field spectrograph |
we present intra night optical variability (inov) study of the 9 narrow-line seyfert 1 (nlsy 1) galaxies which are detected in x-ray at more than 3σ level. our observations cover a total of 9 nights ( 36 hr) with each nlsy 1 monitored for ≥ 3.5 hr in each night. after applying f-test to assess variability status of the... | intra-night optical variability properties of x-ray bright narrow-line seyfert 1 galaxies |
among the methods to focus photons the diffraction in crystals results as one of the most effective for high energy photons. an assembling of properly oriented crystals can form a lens able to focus x-rays at high energy via laue diffraction in transmission geometry; this is a laue lens. the x-ray diffraction theory pr... | x-ray characterization of curved crystals for hard x-ray astronomy |
directed evolution based on saturation mutagenesis at sites lining the binding pocket is a commonly practiced strategy for enhancing or inverting the stereoselectivity of enzymes for use in organic chemistry or biotechnology. however, as the number of residues in a randomization site increases to five or more, the scre... | reshaping an enzyme binding pocket for enhanced and inverted stereoselectivity: use of smallest amino acid alphabets in directed evolution |
on 28th september 2015, india launched its first astronomical space observatory astrosat, successfully. astrosat carried five astronomy payloads, namely, (i) cadmium zinc telluride imager (czti), (ii) large area x-ray proportional counter (laxpc), (iii) soft x-ray telescope (sxt), (iv) ultra violet imaging telescope (u... | planning and scheduling of payloads of astrosat during initial and normal phase observations |
charged particles in the space environment can degrade the scientific performances of x-ray detectors in astronomical telescopes. an efficient countermeasure is to place a magnetic diverter at the exit pupil of optics to deflect charged particles away from the sensitive detection area. in this work, we have performed a... | a preliminary design of the magnetic diverter on-board the extp observatory |
the large magellanic cloud supernova remnant j0454-6713 abutting the h ii region n9 has been observed with xmm-newton. two groups of lines from fe xvii account for half the emission and lines from fe xviii, o vii, and o viii are also clearly detected with the xmm rgs. isothermal equilibrium fits of the epic spectra rep... | xmm observation of the supernova remnant j0454-6713 and the adjacent n9 superbubble |
fluorescent dark matter has been suggested as a possible explanation of both the 3.5 kev excess in the diffuse emission of the perseus cluster and of the deficit at the same energy in the central active galaxy within that cluster, ngc 1275. in this work we point out that such a dark matter candidate can be searched for... | detecting fluorescent dark matter with x-ray lasers |
the high energy cosmic-radiation detection (herd) facility is one of several scientific payloads planned to go onboard china's space station, which is planned to be operational starting in around 2025 for about 10 years. the main scientific objectives of herd are the search for signals of dark matter annihilation produ... | the space station based detector herd: precise high energy cosmic rays physics and multimessenger astronomy |
recent advancements in thin glass materials allowed the development and the mass production of very thin glass foils, like e.g. the willow glass (thickness of 0.1-0.2 mm) produced by corning or af32 produced by schott (thickness down to 0.055 mm). the thickness, strength and flexibility of these glass foils allow bendi... | cold shaping of thin glass foils: a fast and cost-effective solution for making light-weight astronomical x-ray optics |
after more than 15 years of operation of the epic camera on board the xmm-newton x-ray observatory, we have reviewed the status of its thin and medium filters. we have selected a set of thin and medium back-up filters among those still available in the epic consortium and have started a program to investigate their sta... | the thin and medium filters of the epic camera on-board xmm-newton: measured performance after more than 15 years of operation |
astronomical x-ray polarimetry was first explored in the end of the 1960s by pioneering rocket instruments. the craze arising from the first discoveries of stellar and supernova remnant x-ray polarization led to the addition of x-ray polarimeters to early satellites. unfortunately, the inadequacy of the diffraction and... | the growth of interest in astronomical x-ray polarimetry |
stars are the main factories of element production in the universe through a suite of complex and intertwined physical processes. such stellar alchemy is driven by multiple nuclear interactions that through eons have transformed the pristine, metal-poor ashes leftover by the big bang into a cosmos with 100 distinct che... | stellar explosions: hydrodynamics and nucleosynthesis |
currently, very long baseline interferometry technology is widely used in the astronomical measurement areas, providing about 1 μas pulsar positioning accuracy. however, these conventional methods cannot meet the higher position accuracy requirements of x-ray pulsar navigation. in this paper, we provide a novel method ... | study of a high-precision pulsar angular position measuring method |
belinda j wilkes looks back at 20 years of science from the chandra x-ray observatory - and forward towards more discoveries | chandra's revolution in x-ray astronomy |
the nasa marshall space flight center (msfc) has developed a science camera suitable for sub-orbital missions for observations in the uv, euv and soft x-ray. six cameras were built and tested for the chromospheric lyman-alpha spectro-polarimeter (clasp), a joint msfc, national astronomical observatory of japan (naoj), ... | vuv testing of science cameras at msfc: qe measurement of the clasp flight cameras |
the identification list of binaries (ilb) is a star catalogue constructed to facilitate cross-referencing between different catalogues of binary stars. as of 2015, it comprises designations for approximately 120,000 double/multiple systems. ilb contains star coordinates and cross-references to the bayer/flemsteed, dm (... | identification list of binaries |
astrosat has completed 5 years of successful in-orbit operation on 28 september 2020. astrosat is isro's first indian multi-wavelength satellite operating as a space observatory. it is the only satellite which can simultaneously observe in the far uv and a wide x-ray band from 0.3 to 80 kev using different instruments.... | astrosat: concept to achievements |
the space-based multiband astronomical variableonboard computing resources. this object monitor (svom) is a sino-french space mission targeting high-energy transient astrophysical objects such as gamma-ray bursts. the soft x-ray part of the spectrum is covered by the microchannel x-ray telescope (mxt), which is a narro... | analysis methods to localize and characterize x-ray sources with the microchannel x-ray telescope on board the svom satellite |
the research and development of silicon-based x-ray fluorescence detectors achieved its submicron sensitivity. its initial use is intended for in-situ beam monitoring at advanced light-source facilities. the effectively functioning prototype fully leveraged technologies and techniques from a wide array of scientific di... | customisable x-ray fluorescence photodetector with submicron sensitivity using a ring array of silicon p-i-n diodes |
resolve onboard the x-ray satellite x-ray imaging and spectroscopy mission (xrism) is a cryogenic instrument with an x-ray microcalorimeter in a dewar. a lid partially transparent to x-rays (called gate valve or gv) is installed at the top of the dewar along the optical axis. because observations will be made through t... | x-ray transmission calibration of the gate valve for the x-ray astronomy satellite xrism |
plasma models built on extensive atomic data are essential to interpreting observed cosmic spectra. h-like lyman series and he-like triplets observable in the x-ray band are powerful diagnostic lines to measure the physical properties of various types of astrophysical plasmas. electron-impact excitation is a fundamenta... | r-matrix electron-impact excitation data for the h- and he-like ions with z = 6-30 |
we evaluate the single event tolerance of the x-ray silicon-on-insulator (soi) pixel sensor named xrpix, developed for the future x-ray astronomical satellite force. in this work, we measure the cross-section of single event upset (seu) of the shift register on xrpix by irradiating heavy ion beams with linear energy tr... | single event tolerance of x-ray silicon-on-insulator pixel sensors |
the upcoming x-ray missions based on the microcalorimeter technology require exquisite precision in spectral simulation codes in order to match the unprecedented spectral resolution. in this work, we improve the fluorescence k energies for si iixi and s iixiii in the code cloudy. in particular, we provide here a patch ... | cloudy in the microcalorimeter era: improved energies for si and s k fluorescence lines |
the calorimetric electron telescope (calet) on the international space station consists of a high-energy cosmic-ray calorimeter (cal) and a lower-energy calet gamma-ray burst monitor (cgbm). cal is sensitive to electrons up to 20 tev, cosmic-ray nuclei from z = 1 through z ~ 40, and gamma rays over the range 1 gev-10 t... | calet search for electromagnetic counterparts of gravitational waves during the ligo/virgo o3 run |
astronomy has been an inherently visual area of science for millenia, yet a majority of its significant discoveries take place in wavelengths beyond human vision. there are many people, including those with low or no vision, who cannot participate fully in such discoveries if visual media is the primary communication m... | touching the stars: improving nasa 3d printed data sets with blind and visually impaired audiences |
dr. mariko kimura (riken, japan) requests aavso assistance in obtaining v and rc photometry of the cataclysmic variable ss cyg in support of an orbital period study. dr. kimura writes: "the x-ray flux of ss cyg is now increasing and 10-times larger than usual. this object is brightest at x-ray wavelengths in these 25 y... | photometry requested for ss cyg |
we report on the program of design and development of innovative very wide field x-ray optics for space applications. we describe the idea of wide field x-ray optics of the lobster-eye type of both angel and schmidt arrangements. this optics was suggested in 70ies but not yet used in space experiment due to severe manu... | novel wide-field x-ray optics for space |
x-psi simulates rotationally-modified (pulsed) surface x-ray emission from neutron stars, taking into account relativistic effects on the emitted radiation. this can then be used to perform bayesian statistical inference on real or simulated astronomical data sets. model parameters of interest may include neutron star ... | x-psi: x-ray pulse simulation and inference |
hard-x/soft gamma-rays are probes of the most powerful phenomena in the universe. unlike soft x-ray astrophysics, this band has benefited less from the technological advancement due to the difficulty to absorb this radiation and to the lack of focusing instrumentation. for these reasons the quest for innovative soft ga... | astena: an innovative mission concept for broadband high-energy astrophysics |
lobster eye telescopes are a type of innovative telescope design, which could observe celestial objects over a very wide field of view in x-ray band. thanks to this property, lobster eye telescopes are widely used to detect x-ray transients in time-domain astronomy. however, images obtained by lobster eye telescopes ar... | source detection algorithm for lobster eye telescopes with machine learning algorithms |
one of the challenges faced within the astronomical x-ray community is how to produce lightweight high angular resolution optics for a future x-ray mission capable of probing the early x-ray universe. to this end, the differential deposition project at nasa marshall space flight center (msfc) is looking to improve curr... | differential deposition correction of segmented glass x-ray optics |
the space-based multi-band astronomical variable objects monitor (svom) is a chinese-french mission due to be launched in 2023. it is composed of four space borne instruments: eclairs, for detecting x-ray and gamma-ray transients; grm, a gamma-ray spectrometer; vt, a visible telescope and the microchannel x-ray telesco... | calibration of the flight model lobster eye optic for svom |
effective collecting area represents one of principal parameters of optical systems. the common requirement is to obtain as large effective collecting area as it is possible. the paper presents an analytical method of calculating effective collecting length and its maximization for lobster eye optics. the results are a... | effective collecting area of lobster eye optics and optimal value of effective angle |
aims: the beam expander testing x-ray facility (beatrix) is a unique x-ray apparatus now operated at the istituto nazionale di astrofisica (inaf), osservatorio astronomico di brera (oab), in merate, italy. it has been specifically designed to measure the point spread function (psf) and the effective area (ea) of the x-... | first light of beatrix, the new testing facility for the modular x-ray optics of the athena mission |
the chandra x-ray observatory (cxo) was launched over 23 years ago and has been delivering spectacular science over the course of its mission. the advanced ccd imaging spectrometer (acis) is the prime instrument on the satellite, conducting over 90% of the observations. the ccds operate at a temperature of -120°c and t... | the evolution of the acis contamination layer on the chandra x-ray observatory through 2022 |
numerous scientific questions at the forefront of our modern physical understanding require enhanced x-ray astronomical observations beyond the capabilities of existing x-ray telescopes. these observations demand spaceborne x-ray telescopes of unprecedented imaging power. x-ray focusing optics which are simultaneously ... | fabrication of lightweight silicon x-ray mirrors |
parallel computing and steadily increasing computation speed have led to a new tool for analyzing multiple datasets and datatypes: fitting several datasets simultaneously. with this technique, physically connected parameters of individual data can be treated as a single parameter by implementing this connection into th... | simultaneous fits in isis on the example of gro j1008-57 |
the indirect hot slumping technology is being developed at max-planck-institute for extraterrestrial physics (mpe) for the manufacturing of lightweight astronomical x-ray telescopes. it consists of a thermal shaping process to replicate the figure of a suitable mould into segments of x-ray mirror shells made by glass. ... | addressing the problem of glass thickness variation in the indirect slumping technology |
this paper reports the spectroscopic performance improvement of the silicon-on-insulator (soi) pixel detector for x-ray astronomy, by introducing a double-soi (d-soi) structure. for applications in x-ray astronomical observatories, we have been developing a series of monolithic active pixel sensors, named as "xrpixs," ... | spectroscopic performance improvement of soi pixel detector for x-ray astronomy by introducing double-soi structure |
we present the results of master global robotic net optical observations of ligo/virgo s200224ca error-box (o3 set). we observed 380 square degrees inside the 3σ error box during 1 month. we present optical transients found by master auto-detection system during this inspection. they are not the optical counterparts, b... | master optical observation of ligo/virgo s200224ca error-box |
in this essential, claus grupen discusses astroparticle physics in a brief historical outline and describes the latest results without going into mathematical detail. understood as an introduction to this new field of research, it gives an overview of what is going on in the sky, between the stars and between the galax... | neutrinos, dark matter and co: from the discovery of cosmic radiation to the latest results in astroparticle physics |
the space-based multi-band astronomical variable objects monitor (svom) is a french-chinese space mission to be launched in 2021 with the goal of studying gamma-ray bursts, the most powerful stellar explosions in the universe. the microchannel x-ray telescope (mxt) on-board svom, is an x-ray focusing telescope with a d... | testing and modelling of the svom mxt narrow field lobster-eye telescope |
extraterrestrial gamma-ray astronomy is now a source of new knowledge in the fields of astrophysics, cosmic-ray physics, and the nature of dark matter. the next absolutely necessary step in the development of extraterrestrial high-energy gamma-ray astronomy is the improvement of the physical and technical characteristi... | high-energy gamma-ray studying with gamma-400 |
context. focused on the study of transient sources, time domain astronomy today is one of the most active and growing areas of research in astronomy. most of the present and planned surveys aimed at carrying out time domain studies work in the optical band and founded their searching strategies on fixed cadences. altho... | a time domain experiment with swift: monitoring of seven nearby galaxies |
in about four years, the national aeronautics and space administration (nasa) will launch a small explorer mission named the imaging x-ray polarimetry explorer (ixpe). ixpe is a satellite dedicated to the observation of x-ray polarization from bright astronomical sources in the 2 - 8 kev energy range. using gas pixel d... | active galactic nuclei in the era of the imaging x-ray polarimetry explorer |
we have begun to investigate the use of thin-film, multilayer structures to form optics capable of concentrating soft gamma rays with energies greater than 100 kev, beyond the reach of current grazing-incidence hard x-ray mirrors. alternating layers of low- and high-density materials (e.g., polymers and metals) will ch... | a soft gamma-ray concentrator using thin-film multilayer structures |
here we reanalyze the archival chandra data for the central parts of the centaurus a radio galaxy, aiming for a systematic investigation of the x-ray emission associated with the inner radio lobes in the system, and their immediate surroundings. in particular, we focus on four distinct features characterized by the sof... | an analysis of soft x-ray structures at kiloparsec distances from the active nucleus of centaurus a galaxy |
the supernova x-ray database was established a few years ago to make x-ray data on supernovae (sne) publicly available via an elegant searchable web interface. the database has recently been updated to php7, had security updates done, and moved to a new server, ensuring its long-term stability. we urge astronomers to c... | supernova x-ray database (snax) updated to ensure long-term stability |
we intoduce our novel method of super high resolution astronomical x-ray imaging, multi image x-ray interferometer method, modules, missions (mixim). in series of experiments on the ground we not only verified the concept of mixim but also realized 2d imaging with angular resolution better than 0. ''1. employment of sm... | sub-arcseconds to micro-arcsecond x-ray imaging with multi image x-ray interferometer method (mixim): concept and scalabe mission plans |
context. in the present era of large-scale surveys in the time domain, the processing of data, from procurement up to the detection of sources, is generally automated. one of the main challenges in the astrophysical analysis of their output is contamination by artifacts, especially in the regions of high surface bright... | a novel method for transient detection in high-cadence optical surveys. its application for a systematic search for novae in m 31 |
we have been developing a new type of x-ray pixel sensors, "xrpix", allowing us to perform imaging spectroscopy in the wide energy band of 1-20 kev for the future japanese x-ray satellite "force". the xrpix devices are fabricated with complementary metal-oxide-semiconductor silicon-on-insulator technology, and have the... | low-energy x-ray performance of soi pixel sensors for astronomy, "xrpix" |
image plates as x-ray recorder have advantages including reusable, high dynamic range, large active area, and so on. in this work, fuji bas-sr type image plate combined with bas-5000 scanner is calibrated. the fade rates of image plates has been measured using x-ray diffractometric in different room temperature; the sp... | calibration of fuji bas-sr type imaging plate as high spatial resolution x-ray radiography recorder |
x-ray charge coupled devices (ccds) have been the workhorse for soft x-ray astronomical instruments for the past quarter century. they provide broad energy response, extremely low electronic read noise, and good energy resolution in soft x-rays. these properties, along with the large arrays and small pixel sizes availa... | tiny-box: a tool for the versatile development and characterization of low noise fast x-ray imaging detectors |
gratings enable dispersive spectroscopy from the x-ray to the optical, and feature prominently in proposed flagships and smallsats alike. the exacting performance requirements of these future missions necessitate assessing whether the present state-of-the-art in grating manufacture will limit spectrometer performance. ... | limiting spectral resolution of a reflection grating made via electron-beam lithography |
the sino-french space mission svom (space-based multi-band astronomical variable objects monitor) is mainly designed to detect and localize gamma-ray burst events (grbs). the satellite, to be launched late 2021, embarks a set of gamma-ray, x-ray and optical imagers. thanks to its pointing strategy, quick slew capabilit... | the svom mission, a pathfinder for theseus. |
space scientific exploration is becoming the main battlefield for mankind to explore the universe. countries around the world have successively launched various space exploration satellites. accurate calibration on the ground is a key factor for space science satellites to obtain observational results. in order to prov... | the monochromatic x-rays facilities at nim |
we have proposed a new style x-ray interferometer, multi-image x-ray interferometer module (mixim), to achieve high angular resolution. mixim is comprised of a grating and an x-ray detector, and its angular resolution is in inverse proportion to the distance between two components. although we have already detected a 1... | subsub-arcseconds x-ray imaging with multi-image x-ray interferometer module (mixim): experimental results |
in principle, diffractive optics, particularly phase fresnel lenses (pfls), offer the ability to construct large, diffraction-limited, and highly efficient x-ray/$\gamma$-ray telescopes, leading to dramatic improvement in angular resolution and photon flux sensitivity. as the diffraction limit improves with increasing ... | phase fresnel lens development for x-ray and gamma-ray astronomy |
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 |
we present the results from a coordinated xmm-newton + nustar observation of the seyfert 1 galaxy eso 511-g030. with this joint monitoring program, we conduct a detailed variability and spectral analysis. the source remained in a low flux and very stable state throughout the observation period, although there are sligh... | the low-temperature corona in eso 511-g030 revealed by nustar and xmm-newton |
an observation simulator is established, on an event-by-event basis, for the polarimetry focusing telescope array (pfa) on board the planned enhanced x-ray timing and polarimetry observatory (extp). an event generator, based on ximpol, is used to sample the parameters of the x-rays reaching the aperture of the telescop... | implementation of the polarimetry focusing telescope array observation simulator on board the x-ray timing and polarimetry observatory |
the sensitivity of astronomical x-ray detectors is limited by the instrumental background. the background is especially important when observing low surface brightness sources that are critical for many of the science cases targeted by future x-ray observatories, including athena and future u.s.-led flagship or probe-c... | reducing the background in x-ray imaging detectors via machine learning |
accurately estimating of diffuse x-ray background (dxb) is essential for the investigation of sources in the galactic plane observed with insight-hxmt/le, which is a collimated telescope in the soft x-ray energy band with a relatively large field of view. in the high-galactic-latitude region, dxb is dominated by the co... | the diffuse x-ray background of the insight-hxmt/le telescope in the galactic plane |
context. the space-based multi-band astronomical variable objects monitor (svom) mission under development will carry four instruments, and in particular the coded-mask telescope named eclairs, with a large field of view of about 2 sr, operating in the 4-150 kev energy band. the trigger software on board eclairs will s... | the svom/eclairs image trigger with wavelet-based background correction optimised with a one-year simulation of observations |
hard x-/soft gamma-ray astronomy (>100 kev) is a crucial field for the study of important astrophysical phenomena such as the 511 kev positron annihilation line in the galactic center region and its origin, gamma-ray bursts, soft gamma-ray repeaters, nuclear lines from sn explosions and more. however, several key qu... | the trill project: increasing the technological readiness of laue lenses |
in this multi-messenger astronomy era, all the observational probes are improving their sensitivities and overall performance. the focusing on relativistic universe and cosmic evolution (force) mission, the product of a jaxa/nasa collaboration, will reach a 10 times higher sensitivity in the hard x-ray band (e > 10 ... | a broadband x-ray imaging spectroscopy in the 2030s: the force mission |
we present multifrequency observations of the radio source 3cr 403.1, a nearby (z = 0.055), extended (~0.5 mpc) radio galaxy hosted in a small galaxy group. using new high-frequency radio observations from the sardinia radio telescope (srt), augmented with archival low-frequency radio observations, we investigated radi... | high-frequency radio imaging of 3cr 403.1 with the sardinia radio telescope |
the radiation energy of x-ray pulsars is mainly concentrated in the high-energy ray bands, so processing high-energy photon signals is helpful for discovering some young and active pulsars. to quickly and accurately detect effective pulsar signals from a large number of samples within a finite observation time, an auto... | a pulsar search method combining a new feature representation and convolutional neural network |
we present an analysis of recent x-ray observations of the symbiotic star ag peg. the x-ray emission of ag peg as observed with swift in 2015 shows considerable variability on time-scale of days as variability on shorter time-scales might be present as well. analysis of the x-ray spectra obtained in 2013 and 2015 confi... | recent x-ray observations of the symbiotic star ag peg: do they signify colliding stellar winds? |
a solar flare is a transient increase in solar brightness powered by the release of magnetic energy stored in the sun's corona. flares are observed in all wavelengths of the electromagnetic spectrum. the released magnetic energy heats coronal plasma to temperatures exceeding ten million kelvins, leading to a significan... | solar flares |
future space-based x-ray observatories need to be very lightweight for launcher mass constraints. therefore they will use a reduced mirror thickness, which results in the additional requirement of low coating stress to avoid deformation of the initial precisely shaped mirror substrates. due to their excellent reflectio... | development of iridium coated x-ray mirrors for astronomical applications |
this is the first version (v1) of the gravitational lenses and dark matter (glendama) database accessible at http://grupos.unican.es/glendama/database the new database contains more than 6000 ready-to-use (processed) astronomical frames corresponding to 15 objects that fall into three classes: (1) lensed qso (8 objects... | the glendama database |
angular resolution and photon-collecting area are the two most important factors that determine the power of an x-ray astronomical telescope. the grazing incidence nature of x-ray optics means that even a modest photon-collecting area requires an extraordinarily large mirror area. this requirement for a large mirror ar... | monocrystalline silicon and the meta-shell approach to building x-ray astronomical optics |
detection of 54 very high-energy (vhe) neutrinos by the icecube neutrino observatory has opened a new chapter in multi-messenger astronomy. however due to large errors in measuring the directions of the neutrino shower-type events, which dominate the current event list, it is difficult to identify their astrophysical s... | search for extragalactic astrophysical counterparts of icecube neutrino events |
we report on the x-ray detection from srg/erosita (predehl et al. a & a 647, a1, 2021) of the tidal disruption event (tde) at2022dsb. at2022dsb was reported as a new optical transient asassn-22cs on 2022 march 1st, (tns astronomical transient report no. 138375), and was spectroscopically classified as a tde at a re... | srg/erosita detection of the tidal disruption event at2022dsb |
we discuss the astronomical methods of searching for light goldstone bosons (axions and arions). the basic idea is to use processes of coupling between axions and photons: a) the axion decay into two photons; b) the transformation process of photons into axions (arions) in the magnetic fields of stars and also of inter... | new results in searching for axions by astronomical methods |
charge coupled devices (ccd) are detectors widely used in astronomical observation due to their high sensitivity and high spatial resolution. the readout technique is often implemented with analog circuits. the main objective of our research is to replace the analog processing of a ccd signal with the realisation of di... | digital correlated double sampling ccd readout characterization |
estimates of the physical parameters of the hot spot a of the radio galaxy cygnus a were obtained from radio astronomical observations. to estimate the physical parameters of this radio source, we took the dimensions of a spherically symmetric inhomogeneous model of the spot a (without voids inside), the spectrum of wh... | physical parameters of the hot spot a of the radio galaxy cygnus a |
the purpose of this review is to analyze main directions of creation and functioning of major data sources developed by russian astronomers or with their participation and to compare them with the worldwide trends in these fields. we discuss astronomical space missions of the past, present, and future (astron, integral... | russian virtual observatory: data sources |
we report an imaging capability of the japan-led x-ray observatory hitomi, formerly known as astro-h. it carries four scientific instruments of soft x-ray imager (sxi: ccd camera), hard x-ray imager (hxi), soft x-ray spectrometer, and soft gamma-ray detector, allowing us to perform a wide-band high-sensitive imaging sp... | astronomical imaging with the x-ray observatory hitomi |
if a sufficiently advanced civilization can either modulate the emission from an x-ray binary, or make use of the natural high luminosity to power an artificial transmitter, these can serve as good beacons for interstellar communication without involving excessive energy costs to the broadcasting civilization. in addit... | seti at x-ray energies - parasitic searches from astrophysical observations |
the slumped glass optics technology, developed at inaf/oab since a few years, is becoming a competitive solution for the realization of the future x-ray telescopes with a very large collecting area, as e.g. the proposed athena, with more than 2 m2 effective area at 1 kev and with a high angular resolution (5'' hew). th... | slumped glass optics with interfacing ribs for high angular resolution x-ray astronomy: a progress report |
extragalactic radio source 3c 84 (also known as perseus a) is the active nucleus of the giant galaxy ngc 1275, the largest in the perseus galaxy cluster (abell 426). it is one of the brightest x-ray galaxy clusters. the nucleus of galaxy ngc 1275 (seyfert ii type) is a powerful radio source in the northern sky (flux de... | investigation of intra-day variability of the radio galaxy 3c 84 (perseus a) flux density in centimeter range on the rt-32 virac (latvia) and rt-32 nsfctc (ukraine) radio telescopes |
the virtual telescope for x-ray observations (vtxo) is an astrophysics smallsat mission being developed to demonstrate 10-milliarcsecond x-ray imaging using a phase fresnel lense (pfl) based space telescope. pfls promise to provide several orders of magnitude improvement in angular resolution over current state of the ... | formation flying techniques for the virtual telescope for x-ray observations |
x-ray stars have been studied since the beginning of x-ray astronomy. investigating and studying the chromospheric activity from x-ray stellar optical spectra is highly significant in providing insights into stellar magnetic activity. the big data of lamost survey provides an opportunity for researching stellar optical... | x-ray stars observed in lamost spectral survey |
massive stars are extreme stellar objects whose properties allow for the study of some interesting physical processes, including particle acceleration up to relativistic velocities. in particular, the collisions of massive star winds in binary systems lead notably to acceleration of electrons involved in synchrotron em... | the multi-messenger approach to particle acceleration by massive stars: a science case for optical, radio and x-ray observatories |
rapid response and short time latency are very important for time domain astronomy, such as the observations of gamma-ray bursts (grbs) and electromagnetic (em) counterparts of gravitational waves (gws). based on near real-time fermi/gbm data, we developed a low-latency pipeline to automatically calculate the temporal ... | a low-latency pipeline for grb light curve and spectrum using fermi/gbm near real-time data |
massive stars lose a considerable amount of mass during their lifetime. when the star explodes as a supernova (sn), the resulting shock wave expands in the medium created by the stellar mass-loss. thermal x-ray emission from the sn depends on the square of the density of the ambient medium, which in turn depends on the... | massive star mass-loss revealed by x-ray observations of young supernovae |
tes x-ray microcalorimeter arrays provide not only high-energy resolution (fwhm < 10ev) in x-ray spectroscopy but also imaging and high-counting-rate capabilities. they are very promising spectrometer for x-ray astronomy and material analysis. in this paper, we report our recent progress. for material analysis, we h... | tes x-ray microcalorimeters for x-ray astronomy and material analysis |
the wide field imager (wfi) instrument for esa's next large x-ray mission athena is designed for imaging and spectroscopy over a large field of view, and high count rate observations up to and beyond 1 crab source intensity. the other focal plane instrument, the cryogenic x-ifu camera, is designed for high spectral res... | development of the wide field imager instrument for athena |
a simple design of a soft x-ray polarimeter using multilayer mirrors is presented. a multilayer mirror acts as a linear polarization analyzer for x-rays at incidence angles close to the brewster angle. the instrument consists of an x-ray concentrator, a set of multilayer mirrors placed at 45 deg from the optical axis, ... | multilayer mirror-based soft x-ray polarimeter for astronomical observations |
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