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the x-ray pulsar 2s 1553-542 was discovered using the rotation modulation collimator onboard small astronomy satellite 3 in 1975 (apparao et al., 1978, nature, 271, 225). | swift/maxi follow-up of recent outburst from x-ray pulsar 2s 1553-542 |
context. observations and simulations have clearly established that most stars form in multiple systems. characterizing their properties is thus important for our understanding of the star formation process.aims: to provide statistics about the number of companions per star over the full range of angular distances, inf... | new constraints on the multiplicity of massive young stars in upper scorpius |
we have fabricated a blazed x-ray reflection grating with a period of 160 nm using thermally activated selective topography equilibration (taste) and electron-beam (ebeam) physical vapor evaporation. taste makes use of grayscale ebeam lithography to create three-dimensional (3-d) structures in resist, which can then be... | diffraction efficiency of a small-period astronomical x-ray reflection grating fabricated using thermally activated selective topography equilibration |
we have fabricated a 1024-pixel sipm sensor and the associated electronics. we integrated the sipm sensor and the electronics to build a sipm camera. in this paper, we present the fabrication and assembly procedure of the sipm sensor and the readout electronics, and the preliminary result of testing the camera. this ca... | fabrication and testing of a 1024-pixel sipm camera |
micro pixel chambers (μ-pic) are gaseous two-dimensional imaging detectors originally manufactured using printed circuit board (pcb) technology. they are used in mev gamma-ray astronomy, medicalimaging, neutron imaging, the search for dark matter, and dose monitoring. the position resolution of the present μ-pic is app... | development of the micro pixel chamber based on mems technology |
the depfet detector-amplifier structure possesses several unique properties which make it extremely useful as readout element in semiconductor detectors and in particular as building block of semiconductor pixel detectors. variations of depfets can be tuned to specific requirements as to be sensitive only in predetermi... | the depfet detector-amplifier structure for spectroscopic imaging in astronomy and for experiments at free electron lasers |
we investigate the correlation between rest-frame uv flux variability of broad absorption line (bal) quasars and their variability in bal equivalent widths (ews) in a various timescale from <10 days to a few years in the quasar rest frame. we use the data sets of bal ews taken by the sloan digital sky survey reverbe... | a comparison of properties of quasars with and without rapid broad absorption line variability |
a novel triggering function developed for 240-pixel transition-edge sensors is demonstrated under the high rate of particle background. the function is integrated into the standard data acquisition system in the nist tes framework. it enables any type of combination of trigger pattern when a pixel is triggered, which i... | high energy background event identification using local group trigger in a 240-pixel x-ray tes array |
according to our research, the temperature of optical component (o9.7 iab supergiant) was decreasing and its size was increasing over 7 years (1997-2003). we continue our study of spectral and photometric variability of cyg x-1 on the basis of the 44-year long series of multicolor photometric observations and many-year... | on the long-term variability of cyg x-1=v1357 cyg |
we are developing an x-ray soi pixel detector "xrpix" for the next generation x-ray astronomical satellite "force". xrpix is the detector using soi (silicon-on-insulator) technology which makes it possible to integrate a high-resistivity si sensor part and a low-resistivity si cmos circuit part. the cmos circuit is equ... | proton radiation hardness of x-ray soi pixel detectors with pinned depleted diode structure |
the growing interest in the study of the extreme ultraviolet (euv) radiation-matter interaction is feeding up the development of new technologies able to overcame some current technological limits. adaptive optics is an established technology already widely used for wavefront correction in many applications such as ast... | developing an euv multilayer adaptive mirror: the first results |
the future space x-ray astronomy imaging missions require very large collecting areas at still fine angular resolution and reasonable weight. the novel space xray optics substrates such as silicon wafers and thin thermally formed glass enable wide applications of precise and very light weight (volume densities 2.3 to 2... | novel technologies for space x-ray optics |
additive manufacturing, more commonly known as 3d printing, has become a commercially established technology for rapid prototyping and the fabrication of bespoke intricate parts. optical components, such as mirrors and lenses, are now being fabricated via additive manufacturing, where the printed substrate is polished ... | additive manufactured x-ray optics for astronomy |
we present the intraday flaring activity of cyg x-3 in the rise phase of a major flare observed in november-december 2008 at 22 ghz with the vlbi exploration of radio astrometry (vera). the two consecutive intraday flares with a time scale of 3 - 4 hours are similar in their light curve morphologies. the intraday flare... | flaring activity in 2008 vera observation and classification of intraday radio flares in microquasar cyg x-3 |
the soft gamma-ray concentrator is a telescope mission concept utilizing a suitable arrangement of bent multilayer structures of alternating low- and high-density materials. this lens is able to channel gamma-ray photons via total external reflection and concentrate the incident radiation to a point. the channeling tec... | performance simulation of the soft gamma-ray concentrator |
advances in x-ray and gamma-ray astronomy have opened a new window on our universe and revealed a wide variety of binaries composed of a compact object and a be star. in be x-ray binaries, a neutron star accretes the be disk and truncates it through tidal interactions. such systems have important x-ray outbursts, some ... | γ-ray binaries : a bridge between be stars and high energy astrophysics invited review |
previously used mirror technologies are not suitable for the challenging needs of future x-ray telescopes. this is why the required high precision mirror manufacturing triggers new technical developments around the world. some aspects of x-ray mirrors production are studied within the interdisciplinary project intraast... | development of low-stress iridium coatings for astronomical x-ray mirrors |
iridium-based layer systems are highly effective mirror coatings for space-born x-ray telescopes. during the recent years, aschaffenburg university of applied sciences and its partners developed stress compensated chromium-iridium coatings for such astronomical applications, using chromium as an adhesive layer between ... | characterisation of x-ray mirrors based on chromium-iridium tri-layer coatings |
the chandra x-ray observatory (cxo) was launched over 21 years ago and has been delivering spectacular science over the course of its mission. the advanced ccd imager 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 th... | a revised model of the temporal behavior of the acis contamination layer on the chandra x-ray observatory |
theoretical spectral energy distributions (seds) of white dwarfs provide a powerful tool for cross-calibration and sensitivity control of instruments from the far infrared to the x-ray energy range. such seds can be calculated from fully metal-line blanketed nlte model-atmospheres that are e.g. computed by the tübingen... | panchromatic calibration of astronomical observations with state-of-the-art white dwarf model atmospheres |
high-resolution, high throughput optics for x-ray astronomy requires fabrication of well-formed mirror segments and their integration with arc-second level precision. recently, advances of fabrication of silicon mirrors developed at nasa/goddard prompted us to develop a new method of mirror integration. the new integra... | alignment and distortion-free integration of lightweight mirrors into meta-shells for high-resolution astronomical x-ray optics |
this paper reports on the development of on-chip pattern processing in the event-driven silicon-on-insulator pixel detector for x-ray astronomy with background rejection purpose. x-ray charge-coupled device (ccd) detectors, well-established pixel detectors used in this field, has proven that classification of detected ... | development of on-chip pattern processing in event-driven soi pixel detector for x-ray astronomy with background rejection purpose |
the activity of the sun -our nearest star is a natural laboratory for studying the manifestations of cosmic plasma using both ground-based observatories and instruments on spacecraft. at the same time, ground-based observations are significantly supplemented by information outside the absorption spectrum of the earth's... | prospects for ground-based solar radio astronomy in russia |
pyxel is a open-source python package for modeling astronomical x-ray imaging data. it is primarily built on numpy, scipy, astropy, and emcee. the package aims to provide a common set of image analysis tools for astronomers working with extended x-ray sources. i will present an overview of its features, and analysis ex... | pyxel: a python package for astronomical x-ray data modeling |
cosmic dust grains (cd) are part of the evolution of stars and planetary systems and pervade the interstellar medium. thus, their spectral signature may be used to deduce the physical features of the observed astronomical objects or to study many physical and chemical processes in the interstellar medium. however, cd s... | physical vapor deposition synthesis of amorphous silicate layers and nanostructures as cosmic dust analogs |
what can be seen within this universe? since humans are not instinctively aware of the limitations of their sensorium, what is being missed is not immediately obvious. aiming to explore with our imagination the invisible elements in the universe, we created an interactive cosmic art project in collaboration with the gu... | flowers behind the back of the universe: a cosmic art project exploring the invisible |
hot, massive stars (spectral types o and b) have extreme luminosities (10. 4 -10. 6 l?) that drive strong stellar winds through uv line-scattering.some massive stars also have disks, formed by either decretion from the star (as in the rapidly rotating "classical be stars"), or accretion during the star's formation. thi... | radiative ablation of disks around massive stars |
jasmine is an abbreviation for japan astrometry satellite mission for infrared exploration. we are now focusing on the development of two projects, those are nano-jasmine and small-jasmine. the nano-jasmine micro-satellite project, with a primary mirror aperture of 5-cm class, is currently underway to test part of the ... | infrared space astrometry missions: jasmine |
calibration is a basic and important procedure in the radio astronomy. it deduces the solar radio flux which is an important physical quantity of solar observation. it also deducts the flat-field of the spectrometer, displaying the radio spectrogram clearly. in this paper, we first introduce the basic method of calibra... | calibration of solar radio spectrometer of the purple mountain observatory |
we report evidence of the first astrophysical source detected from the moon at mev energies. our detection of cygnus x-1 is a validation of a new investigative paradigm in which the lunar environment is intrinsic to the detection approach: the lunar occultation technique (lot). nasa’s lunar prospector mission served as... | first light: mev astrophysics from the moon |
the abundance of accelerators and the ambient conditions make cygnus x a natural laboratory for studying the life cycle of cosmic-rays (crs). this naturally makes the cygnus x complex a highly interesting source in neutrino astronomy, in particular concerning a possible detection with the icecube neutrino observatory, ... | identification of gamma-rays and neutrinos from the cygnus-x complex considering radio gamma correlation |
in the field of astronomical x-ray telescopes, different types of optics based on grazing incidence mirrors can be used. this contribution describes the special design of a lobster-eye optics in schmidt's arrangement, which uses dual reflection to increase the collecting area. the individual mirrors of this wide-field ... | study of lobster eye optics with iridium coated x-ray mirrors for a rocket experiment |
we describe the laue project devoted to develop a technology for building a 20 meter long focal length laue lens for hard x-/soft gamma-ray astronomy (80-600 kev). the laue lens is designed to be composed of bent crystals made of of gallium arsenide (gaas, 220) and germanium (ge, 111). for the first time, the focusing ... | state-of-the-art of the hard x-/soft γ-ray focusing telescopes: the laue project status |
the cubesat imaging x-ray solar spectrometer (cubixss) is a 6u cubesat currently in a formulation phase under the 2019 nasa h-fort program. cubixss is motivated by a compelling overarching science question: what are the origins of hot plasma in solar flares and active regions? elemental abundances are a unique diagnost... | the cubesat imaging x-ray solar spectrometer (cubixss) |
in order to ensure the effective detection of x-ray astronomical detectors by blocking ultraviolet, visible and infrared light, adding optical thermal filter in front of the load is an effective method. according to the scientific requirements of extp, optical thermal filters with aluminized polyimide (pi) film structu... | optical thermal filters for extp: manufacturing and characterization |
the xrism is the astronomical mission to perform the high-resolution x-ray spectroscopy of astrophysical objects using the micro-calorimeter array. in order to enhance the scientific outputs of the mission, the science operations team (sot) is structured with responsibilities of the spacecraft planning, data processing... | detail plans and preparations for the science operations of the xrism mission |
x-ray-like background has the ability to introduce significant systematic and statistical errors to astronomical measurements from space-based x-ray observatories. statistical errors from radiation-induced x-ray-like background can dominate the noise in images produced by space-based x-ray telescopes and can severely r... | the simulation, composition and shielding of radiation-induced x-ray-like background in space-based x-ray astronomy missions |
the digital access to a sky century @ harvard (dasch) project has been underway for the past decade to digitize and fully reduce (photometry and astrometry) the 450,000 glass plate images (not spectra) of the full sky taken by some 30 harvard telescopes from 1885 to 1992. the data processing pipeline achieves 0.1 mag a... | dasch for days to decades time domain astronomy |
we performed near-diffraction-limited (≃ 0\buildrel{\prime\prime}\over{.} 4 fwhm) n-band imaging of one of the nearest active galactic nuclei (agns) in m51 with the 8.2 m subaru telescope to study the nuclear structure and spectral energy distribution (sed) at 8-13 μm. we found that the nucleus is composed of an unreso... | ground-based mid-infrared study of the compton-thick agn in m51 at 10-100 pc scale |
narrow line seyfert 1 (nlsy1) galaxies constitute a class of active galactic nuclei characterized by the full width at half maximum (fwhm) of the hα broad emission line <2000 km s-1 and the flux ratio of [o iii] to hα <3. their properties are not well understood since only a few nlsy1 galaxies were known earlier.... | properties of narrow line seyfert 1 galaxies |
cosmic ray acceleration by astrophysical shocks in supernova remnants is briefly reviewed. results of numerical modeling taking into account the magnetic field amplification by streaming instability and the shock modification are presented. nonthermal emission produced by accelerated particles in old supernova remnants... | particle acceleration at forward and reverse shocks in snrs |
the einstein probe is a small satellite in time-domain astronomy to monitor the soft x-ray sky. it is a small mission in the space science programme of the chinese academy of sciences. it will carry out systematic survey and characterisation of high-energy transients at unprecedented sensitivity, spatial resolution, gr... | exploring transient x-ray sky with einstein probe |
we report on a systematic search of all the suzaku archival data covering from 2005 august to 2015 may for geocoronal solar wind charge exchange (swcx). in the vicinity of earth, solar wind ions strip an electron from earth's exospheric neutrals, emitting x-ray photons (e.g., snowden et al. 1997). the x-ray flux of thi... | a systematic search for solar wind charge exchange emission from the earth's exosphere with suzaku |
this chapter describes the development of x-ray navigation at the naval research laboratory (nrl) within its astrophysics research programs. the prospects for applications emerged from early discoveries of x-ray source classes and their properties. starting around 1988 some nrl x-ray astronomy programs included navigat... | the nrl program in x-ray navigation |
astronomical x-ray observatories are exposed to various kinds of orbital radiation that has the potential to compromise observations and to degrade the performance of the instruments. particularly the soft proton component with energies below 10 mev poses a major source for observational background and particle-induced... | updates on experimental grazing angle soft proton scattering |
smile (solar wind magnetosphere ionosphere link explorer) is a novel space mission, under development, dedicated to study the dynamic coupling of the solar wind with the earth's magnetosphere in a global way never attempted before. from a highly elliptical earth polar orbit smile will obtain x-ray images of the dayside... | smile: novel and global x-ray imaging of the sun-earth connection |
future investigations of astronomical x-ray sources require light weight telescope systems with large collecting areas and good angular resolution. the wolter i type telescope design offers a suitable possibility for obtaining performant x-ray mirrors with high collecting areas. the technology based on replicated slump... | iridium coatings for space based x-ray optics |
all-sky and large-area astronomical surveys and their cataloged data over the whole range of electromagnetic spectrum are reviewed, from γ-ray to radio, such as fermi-glast and integral in γ-ray, rosat, xmm and chandra in x-ray, galex in uv, sdss and several poss i and ii based catalogues (apm, maps, usno, gsc) in opti... | astronomical surveys, catalogs, databases, and archives |
an important challenge for the x-ray astronomy of the new millennium is represented by the implementation of an xray telescope able to maintain the exquisite angular resolution of chandra (with a sub-arcsec hew, on-axis) but, at the same time, being characterized by a much larger throughput and grasp. a mission with si... | beyond chandra (towards the x-ray surveyor mission): possible solutions for the implementation of very high angular resolution x-ray telescopes in the new millennium based on fused silica segments |
the classification of the x-ray sources into classes (such as extragalactic sources, background stars, ...) is an essential task in astronomy. typically, one of the classes corresponds to extragalactic radiation, whose photon emission behaviour is well characterized by a homogeneous poisson process. we propose to use n... | new distance measures for classifying x-ray astronomy data into stellar classes |
outflows are ubiquitous in accreting systems across 10 orders of magnitude in mass, and there is good evidence that mass-loaded winds are launched from the accretion discs of quasars and cataclysmic variables (cvs). perhaps the most spectacular evidence for accretion disc winds is the blue-shifted, broad absorption lin... | disc winds matter: modelling accretion and outflow on all scales |
within the project jeumico, an acronym for "joint european mirror competence", the aschaffenburg university of applied sciences and the czech technical university in prague started a collaboration to develop mirrors for x-ray telescopes. corresponding mirror segments use substrates of flat silicon wafers which are coat... | jeumico: czech-bavarian astronomical x-ray optics project |
we propose a novel high performance radiation detector and imaging sensor by a ground-breaking core-shell diode array design. this novel core-shell diode array are expected to have superior performance respect to ultrahigh radiation hardness, high sensitivity, low power consumption, fast signal response and high spatia... | core-shell diode array for high performance particle detectors and imaging sensors: status of the development |
this dissertation explores the challenges and advancements introduced by the arrival of new-generation radio telescopes for understanding the physical and chemical structure of the interstellar medium (ism). new-generation broadband radio instruments, and particularly broadband interferometers, provide the opportunity ... | astrochemistry in the age of broadband radio astronomy |
we have developed transition-edge sensor (tes) microcalorimeter arrays with high count-rate capability and high energy resolution to carry out x-ray imaging spectroscopy observations of various astronomical sources and the sun. we have studied the dependence of the energy resolution and throughput (fraction of processe... | high count-rate study of two tes x-ray microcalorimeters with different transition temperatures |
we present a new simulation framework, based on the python programming language and specifically developed for x-ray polarimetric applications, called ximpol. starting from an arbitrary source model (including morphological, temporal, spectral and polarimetric informations), ximpol uses the response functions of the de... | ximpol: a new x-ray polarimetry observation-simulation and analysis framework |
all-sky surveys are crucial to discover transient objects. in reality, however, it is impossible to achieve high sensitivity, high cadence, wide sky coverage, and broad wavelength range at the same time. this is where observations with small telescopes can come in significant, as small telescopes often can make high ca... | ninjasat: an agile cubesat approach for monitoring of bright x-ray compact objects |
neutrons travel along straight lines in free space, but only survive for a distance which depends on their energy. thus, detecting neutrons in space in principle provides directional and distance information. apart from secondary neutrons produced by cosmic-ray interactions in the earth atmosphere, which are the domina... | neutron astronomy |
we announce the public release of the application program interface (api) for the open astronomy catalogs (oacs), the oacapi. the oacs serve near-complete collections of supernova, tidal disruption, kilonova, and fast stars data (including photometry, spectra, radio, and x-ray observations) via a user-friendly web inte... | open astronomy catalogs api |
we present high sensitivity array and enhanced multi-element remotely linked interferometer network observations of the radio-loud broad-lined type ic supernova ptf11qcj obtained ∼7.5 yr after the explosion. previous observations of this supernova at 5.5 yr since explosion showed a double-peaked radio light curve accom... | vlbi observations of supernova ptf11qcj: direct constraints on the size of the radio ejecta |
a new phenomenon has emerged in high-energy astronomy in the past few years: the fast radio burst. fast radio bursts (frbs) are millisecond-duration radio bursts whose dispersion measures imply that they originate from far outside of the galaxy. their origin is as yet unknown; their durations and energetics imply that ... | a repeating fast radio burst: radio and x-ray follow-up observations of frb 121102 |
we have been developing p-channel charge-coupled devices (ccds) for the upcoming x-ray astronomy satellite xrism, planned to be launched in 2021. while the basic design of the ccd camera (soft x-ray imager: sxi) is almost the same as that of the lost hitomi (astro-h) observatory, we are planning to reduce the phenomeno... | optical blocking performance of ccds developed for the x-ray astronomy satellite xrism |
multilayer x-ray mirrors consist of a coating of a large number of alternate layers of high z and low z materials with a typical thickness of 10-100 å , on a suitable substrate. such coatings play an important role in enhancing the reflectivity of x-ray mirrors by allowing reflections at angles much larger than the cri... | darpanx: a python package for modeling x-ray reflectivity of multilayer mirrors |
this thesis describes the application of state-of-the-art high-energy x-ray studies to the astronomical quest for understanding obscured active galactic nuclei (agn). these agn are supermassive black holes growing by accretion of matter located in the nuclei of galaxies. the material that feeds these black holes also o... | the accretion and obscured growth of supermassive black holes: first constraints on the local heavily obscured agn fraction with nustar |
with the observation of the gravitational wave event of august 17th 2017 the multi-messenger astronomy era has definitely begun. with the opening of this new panorama, it is necessary to have new instruments and a perfect coordination of the existing observatories. crystal eye is a detector aimed at the exploration of ... | preliminary results of the pixel characterization for the crystal eye, a new x- and γ-ray satellite detector for multi-messenger astronomy |
with the advent of the nanosat/cubesat revolution, new opportunities have appeared to develop and launch small (∼1000 cm3), low-cost (∼us 1m) experiments in space in very short time frames (∼2 yr). in the field of high-energy astrophysics, in particular, it is a considerable challenge to design instruments with compell... | lecx: a cubesat experiment to detect and localize cosmic explosions in hard x-rays |
fast radio bursts (frbs) are millisecond duration pulses of radio emission that are bright enough to be seen from other galaxies. the nature of the objects that produce fast radio bursts has captivated the interest of astronomers since their discovery in 2007. the durations and energetics of frbs imply a compact, highl... | the progenitors of fast radio bursts |
resolve onboard the x-ray satellite xrism is a cryogenic instrument with an x-ray microcalorimeter in a dewar. a lid partially transparent to x-rays is installed at the top of the dewar along the optical axis, which is called the gate valve (gv). because observations will be made through the gv for the first few months... | x-ray transmission measurements of the gate valve for the x-ray astronomy satellite xrism |
e2v designs and manufactures a wide range of sensors for space and astronomy applications. this includes high performance ccds for x-ray, visible and near-ir wavelengths. in this paper we illustrate the maturity of cmos capability for these applications; examples are presented together with performance data. the majori... | e2v cmos and ccd sensors and systems for astronomy |
next generation x-ray optics (ngxo) team at the goddard space flight center (gsfc) has been developing a new silicon-based grazing incidence mirror technology for future high resolution x-ray astronomical missions. recently, the gsfc team completed the construction of first few mirror modules that contain one pair of m... | analysis of the ngxo telescope x-ray hartmann data |
this chapter deals generally with the high-energy astrophysics of the sun, specifically with solar flares and coronal mass ejections (cmes), but it also touches on the whole range of nonthermality or departures from maxwellian distributions in solar plasmas. radio, x-ray, and î³-ray observations provide primary remote-... | chapter 9 - high-energy solar physics |
the solar atmosphere is highly dynamic and morphologically complex. solar transient phenomena such as flares, eruptions, and explosive events evolve on time scales too fast to be covered effectively by slit spectrograph rasters. the euv snapshot imaging spectrograph (esis) is a new suborbital rocket-borne slitless spec... | first flight of the euv snapshot imaging spectrograph |
mass accreting stellar mass and supermassive black holes are strong sources of x-rays. the x- ray observations enable studies of the process of black hole accretion and give us information about the spacetime background. in the framework of my thesis work, i have continued the development of a general-relativistic ray-... | simulation of black hole inner accretion disk-corona and optimization of the hard x-ray polarimeter, x-calibur |
the first part of this thesis combines bolocam observations of the thermal sunyaev-zel'dovich (sz) effect at 140 ghz with x-ray observations from chandra, strong lensing data from the hubble space telescope (hst), and weak lensing data from hst and subaru to constrain parametric models for the distribution of dark and ... | a multiwavelength study of the intracluster medium and the characterization of the multiwavelength sub/millimeter inductance camera |
we report on the progress in innovative x-ray mirror development with focus on requirements of future x-ray astronomy space projects. various future projects in x-ray astronomy and astrophysics will require large lightweight but highly accurate segments with multiple thin shells or foils. the large wolter 1 grazing inc... | innovative space x-ray telescopes |
characteristic features of the resonances and background cross sections for photoionization (σpi) of oxygen-like iron ion, fe xix + hν → fe xx + e, are demonstrated. the features are introduced by excitations of the core ion to states of n = 2,3,4 complexes in σpi of the ground, equivalent electron, and single valence ... | characteristic features in photoionization of fe xix |
china is raising the stakes in its bid to become a major player in space science. at a kick-off meeting in beijing last week, china's national space science center began detailed design studies for a satellite that would round out an array of orbiting platforms for probing x-rays from the most violent corners of the co... | china hones plans for ambitious x-ray probe |
cataloging astrophysical sources is a fundamental operation in astronomy. while simple in principle, cataloging becomes more complicated for images with low signal to noise and degeneracies across different emission components. we analyze chandra deep field - south (cdf-s) data using a novel method called probabilistic... | a transdimensional approach to modeling the cosmic x-ray background |
the soft x-ray spectrometer (sxs) is one of four instruments that will be flown on the japanese astro-h satellite, planned for launch in late 2015/early 2016. the sxs will perform imaging spectroscopy in the soft x-ray band using a 6x6 array of silicon microcalorimeters operated at 50 mk, cooled by an adiabatic demagne... | performance testing of the astro-h flight model 3-stage adr |
some sea and water animals have strange mirror eyes which have (or might have) potential application in science and technology in general and in x—ray astrophysics in particular. while the principles of mirror eyes of decapods (lobsters, crayfishes) are already applied in space and ground—based imaging experiments, the... | biomimetics and astronomical x-ray optics |
the x-ray surveyor mission concept is designed to make dramatic increases in discovery space and science capabilities for x-ray astronomy. these would be accomplished through orders of magnitude improvements over chandra in sensitivity, field of view for sub-arcsec imaging, effective area for grating spectroscopy, and ... | capabilities and science drivers for the x-ray surveyor mission |
advances in technology and instrumentation open new windows for observing astrophysical objects. the first half of my dissertation involves the development of atomic layer deposition (ald) coatings to create high reflectivity uv mirrors for future satellite astronomical telescopes. aluminum (al) has intrinsic reflectan... | atomic layer deposition reflective coatings for future astronomical space telescopes and the solar corona viewed through the minxss (miniature x-ray solar spectrometer) cubesats |
we describe our progress in developing a method for correcting residual figure errors in x-ray mirrors. the technology has applications to both synchrotron radiation beamlines and x-ray astronomy. our concept is to develop mirrors that are on the order of a millimeter thick. a magnetic smart material (msm) is deposited... | controlling the shapes of coated silicon substrates via magnetic fields, a progress report |
the japanese x-ray astronomy satellite, hitomi (astro-h) carried two hard x-ray telescopes (hxt), covering the energy band from 5 kev to 80 kev. in the initial functional verification phase of the onboard instruments, g21.5-0.9 and crab nebula were observed with hxt. the data of g21.5-0.9 observation indicated that the... | the hitomi (astro-h) hard x-ray telescope (hxt): current status of calibration |
we describe the tools and the underlying methods and principles for generating the spectral response functions for the four imaging instruments that were flown on the hitomi x-ray astronomy satellite [soft x-ray spectrometer, or sxs; soft x-ray imager, or sxi, and two hard x-ray imagers, or hxi]. in essence, the spectr... | spectral response and effective area functions of the hitomi imaging instruments |
the results of a 3d doppler tomography analysis for the x-ray binary system cyg x-1 in the heii λ 4686 å line are presented. information about the motions of gaseous flows outside the orbital plane has been obtained for the first time. line profiles obtained in june 2007 on the 2-m telescope of the terskol branch of th... | 3d doppler tomography of the x-ray binary system cygnus x-1 from spectral observations in 2007 in the heii λ 4686 å line |
usually instruments for high-energy γ-quanta registration consists of converter (where γ-quanta produced pairs) and calorimeter for particles energy measurements surrounded by anticoincidence shield used to events identification (whether incident particle was charged or neutral). the influence of pair formation by γ-qu... | gamma-telescopes fermi/lat and gamma-400 trigger systems event recognizing methods comparison |
astronomical observations of distant and faint x-ray sources will expand our understanding of the evolving universe. these challenging science goals require x-ray optical elements that are manufactured, measured, coated, aligned, assembled, and tested at scale. the next generation x-ray optics (ngxo) group at nasa godd... | mass manufacturing of high resolution and lightweight monocrystalline silicon x-ray mirror modules |
the e-callisto (compound astronomical low-cost low-frequency instrument for spectroscopy and transportable observatory) is a worldwide radio-spectrograph network with 24 hours a day solar radio burst monitoring. the e-callisto network is led by the swiss federal institute of technology zurich (ethz zurich), which work ... | a year of operation of melibea e-callisto solar radio telescope |
the future space x-ray astronomy imaging missions require very large collecting areas at still fine angular resolution and reasonable weight. the novel substrates for x-ray mirrors such as silicon wafers and thin thermally formed glass enable wide applications of precise and very light weight (volume densities 2.3 to 2... | space optics with silicon wafers and slumped glass |
the southern african large telescope (salt) is a 10-m ground-based optical-ir telescope which has a range of instrumentation ideally suited to observe a variety of phenomena in astrophysical objects powered by accretion, from binary stellar systems (involving white dwarfs, neutron stars and black holes), to active gala... | multi-wavelength studies of accretion phenomena with salt and astrosat |
gamma-ray astrophysics in the energy range of ∼ 80 kev to several hundred kev has an extraordinary potential for understanding physical processes in the universe. currently, astronomical observations in this energy band are only possible with coded-aperture telescopes (such as integral) or background-limited collimated... | simulation and optimization of a soft gamma-ray concentrator using thin-film multilayer structures |
the advanced telescope for high energy astrophysics (athena) is a large-class mission of the european space agency (esa). it is currently entering an assessment study phase, with launch planned for 2028. athena has been designed to address the science theme "the hot and energetic universe", which poses two key question... | exploring the hot and energetic universe: the first scientific conference dedicated to the athena x-ray observatory |
active galactic nuclei (agn) produce the highest intrinsic luminosities in the universe from within a compact region. the central engine is thought to be powered by accretion onto a supermassive black hole. a fraction of this huge release of energy influences the evolution of the host galaxy, and in particular, star fo... | a changing-look agn to be probed by x-ray polarimetry |
we present the results of ongoing characterization of cadmium zinc telluride (czt) semiconductors produced by redlen technologies. in particular we hope to determine their viability for future x-ray astronomy missions such as the high energy x-ray probe (hex-p). the fully fabricated hybrid detectors consist of czt crys... | characterization of redlen czt detectors for hard x-ray astronomy |
we present the results of ongoing characterization of cadmium zinc telluride (czt) semiconductors produced by redlen technologies for use in x-ray astronomy. the fully fabricated hybrid detectors consist of czt crystals with a collecting area of 2 cm x 2 cm and thickness of 3mm mounted on a custom asic originally desig... | characterization of redlen czt detectors for x-ray astronomy |
in this contribution i discuss the impact that blazars are having on today's multi-frequency and time-domain astrophysics, as well as how they are contributing to the opening of the era of multi-messenger astronomy. in this context i report some preliminary results from a systematic spectral and timing analysis carried... | multi-frequency, multi-messenger astrophysics with blazars at asdc and bsdc |
high quality imaging system of telescopes in astronomy requires innovations to remove or correct the mid-spatial frequency (msf) ripples on the mirror surface of lightweight optics. when the telescope is sent to the space, its launch mass is the key point to limit its collecting area. therefore, the lightweight optics ... | mechanics of magnetostrictive thin film deformation and its application in active x-ray optics |
future x-ray astronomy missions will be based on instruments with apertures much larger than those used up to now. therefore, the risk posed by hyper-velocity dust grains in the space environment to the onboard instrumentation will increase, especially when a larger aperture is combined with a longer focal length. star... | hyper-velocity impact risk assessment and mitigation strategies in the context of future x-ray astronomy missions |
current studies of extragalactic x-ray sources using data from orbital observatory xmm- newton are at the front line of x-ray astronomy. resolution capacity of the observatory instruments enable to detect separate x-ray sources in the close galaxies. in this study we used data from recently published 4xmm-dr9 catalog. ... | discrete x-ray sources in galaxy clusters |
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