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we observed the localization region of the short grb210529b (trigger 644025222.097546) detected by the gamma-ray burst monitor (gbm) on the fermi satellite with the palomar 48 inch telescope equipped with the 47 square degree zwicky transient facility (ztf; bellm et al., 2019; graham et al., 2019) camera. we obtained a... | grb210529b: zwicky transient facility follow-up of a fermi short grb (trigger 644025222) |
future strategic astrophysics missions intend to answer the questions "how did our universe begin and evolve?" "how did galaxies, stars, and planets come to be?" and "are we alone?" enabling these missions requires advances in key technologies far beyond the current state of the art. nasa's physics of the cosmos2 (pcos... | nasa's physics of the cosmos and cosmic origins programs manage strategic astrophysics technology development in preparation for the next decadal survey |
v1324 sco falls within one of the fields that the microlensing observations in astrophysics collaboration (moa; wagner+ 2012atel.4157....1w) continually observes with the moaii 1.8m telescope at mt. johns observatory in new zealand. v1324 sco was initially detected in 2012 april by their high-cadence i-band photometry.... | vizier online data catalog: multiwavelength obs. of gamma-ray nova sco 2012 (finzell+, 2018) |
the launch of the chandra x-ray observatory twenty years ago signified the beginning of a golden age in x-ray astronomy. in this talk i will provide some historical overview and highlight a few of chandra's great achievements. | twenty years of discovery with the chandra x-ray observatory |
strong winds from massive stars are a topic of interest to a wide range of astrophysical fields, e.g., stellar evolution, x-ray binaries or the evolution of galaxies. massive stars, as heavy as 10 to 20 solar masses, generate dense fast outflows that continuously supply their surroundings with metals, kinetic energy an... | accretion flows around compact objects: stellar wind and neutron stars in massive binaries |
detector arrays used in gamma-ray astronomy must be calibrated; one way is by using auxiliary detectors. we built two auxiliary particle detectors with an area of 20x20 , using plastic scintillator bars, each one with two optical ``waveshifter'' fibers that guide the light to a photomultiplier, which in turn records th... | construcción y caracterización de detectores auxiliares para la calibración de un observatorio de rayos gamma |
we propose a program to advance the silicon photomultiplier (sipm) readout for the csi(tl) calorimeter subsystem on the all-sky medium-energy gamma-ray observatory (amego). amego is a probe-class mission concept, formerly known as compair; nrl is the pi institution for the csi calorimeter – one of three major amego sub... | advanced sipm readout for the amego csi calorimeter |
the whirlpool galaxy provides a spectacular example of the striking appearance of a spiral galaxy. while visible light observations may showcase the bright stars and emission nebulae, infrared observations can provide greater detail into the dust distribution, and x-ray observations can highlight the largest of the sta... | a multiwavelength visualization of galactic structure in the whirlpool galaxy |
the international astronomical consortium for high energy calibration (iachec) was founded in 2006 and has since annually been hosting a workshop attended by instrument teams from all high energy observatories. consequently, the iachec has become the leading forum on observatory cross-calibration with yearly campaigns,... | iachec: the status of high energy cross-calibration. |
the cherenkov telescope array (cta) project, led by an international collaboration of institutes, aims to create the world's largest next generation observatory for very high energy (vhe) gamma-ray astronomy. it will be devoted to observations in a wide band of energy, from a few tens of gev to a few hundreds of tev wi... | assessment of the gct prototype's optical system implementation and other key performances for the cherenkov telescope array |
an x-ray pulsar (xrp) is a highly-magnetized neutron star (ns) that rotates while emitting beams of x-ray radiation produced primarily in the vicinity of its magnetic poles. if these beams happen to cross our line of sight and the ns’s spin and magnetic axes are not aligned, then our telescopes detect it as a periodica... | exploring pulsars with polestar |
infrared photometry of cyg x-3 was carried out in 2016 and 2017 at the 2.5m telescope of the caucasian mountain observatory (cmo) of the lomonosov moscow state university sternberg state astronomical institute (msu sai). the telescope is equipped with an infrared camera-spectrograph astronircam. it was used in a photom... | vizier online data catalog: nir variability of cyg x-3 (antokhin+, 2022) |
sn 2020nlb was discovered on 2020 june 25.25 ut (mjd 59025.25) by the asteroid terrestrial impact last alert system (atlas) survey. the last non-detection from atlas was 2 days earlier (2020 june 23.28). the field of sn 2020nlb was also monitored by the itagaki astronomical observatory's 0.35m telescope in okayama, jap... | vizier online data catalog: type ia sn 2020nlb opt. photometry & spectra (sand+, 2021) |
the gamma-ray energy range from a few hundred kev to a few hundred mev has remained largely unexplored, mainly due to the challenging nature of the measurements, since the pioneering, but limited, observations by comptel on the compton gamma-ray observatory (1991- 2000). this energy range is a transition region between... | compton-pair production space telescope (compair) for mev gamma-ray astronomy |
dr. nicolas grosso (cnrs, observatoire astronomique de strasbourg) has requested aavso assistance in monitoring the young eruptive star (fuor type) v2492 cyg from the optical to the infrared in support of x-ray observations with xmm-newton scheduled for 2017 april 18 ut as part of his study of the complex variabililty ... | v2492 cyg monitoring requested in support of xmm observations |
ground based gamma-ray astronomy has progressed dramatically over the past 40 years. currently there are 176 confirmed sources detected above 100 gev ranging from supernova remnants (snr) to active galaxies and other objects the next generation of imaging air cherenkov telescopes (iact) is currently being developed. th... | development of a low cost telescope system for vhe astronomy |
taurus hill observatory (tho), observatory code a95, is an amateur observatory located in varkaus, finland. the observatory is maintained by the local astronomical association warkauden kassiopeia. tho research team has observed and measured various stellar objects and phenomena. observatory has mainly focused on exopl... | summary of the season 2018 - 2019 exoplanet observations in taurus hill observatory |
gamma-ray line astronomy began in the 1970s, but the field is still in its infancy. the signature of positron annihilation at 511 kev was the first gamma-ray line to be detected as originating outside of our solar system. after 40 years of observations, the galactic sources of positrons are still unconfirmed and this r... | diffuse gamma-ray line astronomy with amego |
drs. hans moritz guenther (mit) and christian schneider (universitaet hamburg, hamburger sternwarte) have requested aavso observers' assistance in monitoring five t tau stars in support of several observations with xmm-newton scheduled for the coming months. targets, as well as dates for august and september, are given... | xmm-newton observing five t tau stars |
the maunakea scholars program, designed to bring hawai'i's high school students into one of the world's most advanced observatory communities, has dramatically expanded in the past five years reaching schools on all six major hawaíian islands.launched in 2015 and now working with its fifth cohort of student astronomers... | maunakea scholars and manu |
v1391 cas = n cas 2020 = tcp j00114297+6611190 was discovered by stanislav korotkiy (ka-dar obs./astrovert, kuz'minskoye, russian fed.) and kirill sokolovsky (msu/sai msu/asc lebedev) at unfiltered magnitude 12.9 (v zero-point) (using a 135-mm f/2.0 telephoto lens + sbig st-8300m ccd camera as part of the nmw survey) o... | n cas 2020 = tcp j00114297+6611190 |
the telescope structure of the stratospheric observatory for infrared astronomy (sofia) is subject to vibration excitation due to aircraft motions and turbulence from the airflow coming into the telescope cavity. a proper understanding of the dynamical behavior of the telescope structure under operational loads is cruc... | a new finite element model of the sofia primary mirror cell to investigate dynamical behavior |
we observed in the last weeks the flat spectrum radio quasar txs 0025+197 (ra: 00 27 29.8 dec: +20 00 27 j2000.0) at redshift z=1.55 (alam et al., 2015, apjs, 219, 12) from the astronomical observatory of the university of siena, in the framework of our program dedicated to the optical monitoring of blazars that, being... | optical evolution of the flaring blazar txs 0025+197 |
transient astronomy has witnessed a remarkable evolution with recent discoveries across all astrophysical messengers. we here discuss present key examples of transient sources which would be prime targets for wide field-of- view ground-based observatories observing in the very-high-energy gamma-ray domain. | all-sky time domain astrophysics with very high energy gamma rays |
in order to have a better understanding of the physics behind the non-thermal cosmic sources a multi-wavelength approach is necessary. radio astronomy has played a fundamental role in determining accurately the positions, structures and behaviors of many of the sources detected at gamma-rays. the synergies between radi... | future radio astronomy in the context of cherenkov telescope array |
the landscape of astronomical observatories and instruments is evolving rapidly. the next two decades will see the advent of several major projects, which are expected to revolutionize our understanding of our universe. reviewing all of them would be tedious, and would require a dedicated volume. in this contribution, ... | future instrumentation |
beyond ultra-deep frontier fields and legacy observations (buffalo) is an astronomical survey built around the six hubble space telescope (hst) frontier fields clusters designed to learn about early galactic assembly and clustering and prepare targets for observations with the james webb space telescope. buffalo will p... | the buffalo hst survey |
the virgin islands robotic telescope (virt) is an 0.5m robotic telescope located at the easternmost and southernmost optical observatory in the united states at a latitude of 18.5n and longitude of 65w. the observatory is located on the island of st thomas in the united states virgin islands (usvi). astronomers from th... | the etelman observatory and the virgin islands robotic telescope: 2017 milestone achievements and determined resilience in the usvi |
chandra x-ray observatory revolutionized the x-ray astronomy as being the first, and so far the only, x-ray telescope achieving sub-arcsecond spacial resolution. chandra is comprised of three principal elements: the high resolution mirror assembly (hrma), pointing control and aspect determination (pcad) system, and the... | the stability of chandra telescope pointing and spacial resolution |
the universe is a highly dynamic system. under the primary influence of gravity, matter in the universe clumped together to create the structure we currently observe with our telescopes. gravity formed objects on vastly different scales, from planets and stars that form solar systems, to vast collections of star system... | a study of abell 2146: dark and luminous |
we report that the blazar s5 0716+714 (ra: 7 21 53.45 dec: 71 20 36.36 j2000.0) reached last night (may 31.83) the optical magnitude r=12.16(0.01). the blazar is bright in optical since a few months (see atel #11107,#11339) and we are monitoring it from the astronomical observatory of the university of siena since the ... | recent enhancement of the r-band optical flux from the active blazar s5 0716+714 |
the cherenkov telescope array (cta) is the next generation ground-based observatory for gamma-ray astronomy at very high energies. with more than 100 telescopes at two sites, cta will be the world's largest and most sensitive highenergy gamma-ray observatory covering the full sky with a northern array located at the ro... | cherenkov telescope array (cta) - challenges in systems engineering and project management |
a nationwide network of observatories has been created to study the effects of the 2017 eclipse on the f-region of the ionosphere. these include the superdarn hf radars in oregon and kansas, software defined radios in oregon, kansas, and south carolina, and scintillation receivers placed northward of the central eclips... | hf band observations and modeling of the 2017 eclipse |
as a follow-up of the flaring activity of the flat-spectrum radio quasar 3c 345 (z = 0.5928, lynds, c.r., et al., 1965, apj, 142, 1667) in gamma rays, we observed the source in optical with the 81cm telescope of the osservatorio astronomico della regione autonoma valle d'aosta (italy), and the 1.22m telescope of the as... | optical follow-up of the gamma-ray flare from the fsrq 3c 345 |
wednesdayevening the laser interferometer gravitational-wave observatory (ligo) collaboration quietly mentioned that theyd found gravitational waves from yet another black-hole binary back in june. this casual announcement reveals what is so far the lightest pair of black holes weve watched merge opening the door for c... | ligo finds lightest black-hole binary |
x-ray emission from cosmic sources indicates that these sources are heated to temperatures exceeding a million degrees or that they contain highly energetic particles. recent x-ray telescopes, such as the chandra x-ray observatory and xmm-newton, observed thousands of cosmic x-ray sources. these observations greatly im... | an extraordinary view of the universe: the use of x-ray vision in space science |
karen marie strom, longtime researcher in the processes of star formation, died of a sudden illness on 29 august 2014. strom was born on 18 august 1941 in fairfax, oklahoma, to ray wilson and lillian mae (schurch) lewallen. she received her undergraduate degree from harvard college in 1964, then worked for several year... | obituary: karen m. strom (1941-2014) |
during the past decade observations across the electromagnetic spectrum have led to broad progress in the understanding of galaxy clusters and their far more abundant smaller siblings, groups. from the x-rays, where chandra and xmm have illuminated old phenomena such as cooling cores and discovered new ones such as sho... | special session 2: cosmic evolution of groups and clusters |
following the successful scientific space missions by the european space agency (esa) and the european southern observatory (eso) in chile, as well as the high-energy particle activities at cern in genve, we have created a ph.d. program dedicated to the formation of scientists in the field of relativistic astrophysics.... | artium mater in relativistic astrophysics : new perspectives for a european-latin american phd program |
the source s4 1030+61 was observed (code s2087e) with the vlba of the national radio astronomy observatory (nrao) during four sessions: 2010-05-24, 2010-07-09, 2010-08-28 and 2010-10-18 (noted as 'epochs' below). we supplemented our analysis with the data obtained within the mojave programme. observations are done at 1... | vizier online data catalog: s4 1030+61 vlba observations, 2009-2014 (kravchenko+, 2016) |
nuclear astrophysics aims at understanding the cosmic origin of the chemical elements and the energy generation in stars. it constitutes a truly multidisciplinary arena that combines tools, developments, and achievements in theoretical astrophysics, observational astronomy, cosmochemistry, and nuclear physics: the emer... | nucleosynthesis in stellar explosions: type ia supernovae, classical novae, and type i x-ray bursts |
solar spectral irradiance (ssi) has been measured on a daily basis by the solar radiation and climate experiment (sorce) since 2003 and by the thermosphere ionosphere mesosphere energetics dynamics (timed) mission since 2002. this includes the whpi timeframe as well as the whole heliosphere interval (whi) during the pr... | solar spectral irradiance during whpi and comparison to whi and wsm |
the gamma-ray energy range from several hundred kev to a hundred mev has remained largely unexplored, since the observations by instruments on the compton gamma-ray observatory (1991- 2000) and on integral (since 2002). accurate measurements in this energy range are critical for answering a broad range of astrophysical... | compton-pair production space telescope: extending fermi-lat discoveries into mev gamma-ray astronomy |
the gamma-ray sky offers a unique view into broad range of high energy astrophysical phenomena, from nearby solar flares, to galactic pulsars, to gamma-ray bursts at the furthest reaches of the universe. in recent years, results from the fermi mission have further demonstrated the broad range of topics that can be addr... | future prospects for space-based gamma ray astronomy |
the main objective of the original work presented in this thesis is to develop a theoretical framework to understand the growth, cosmological evolution and observational features of the first black holes, formed when the universe was younger than ∼1 gyr. in the first part a growth model is assembled, based on the devel... | the first black holes in the cosmic dark ages |
in the framework of the cherenkov telescope array (cta) observatory, the italian national institute of astrophysics (inaf) has recently inaugurated in sicily (italy), at the serra la nave astronomical site on the slopes of mount etna, a large field of view (9.6 degrees) dual-mirror prototype (astri sst-2m) of the cta s... | the astri prototype and mini-array: precursor telescopes for the cherenkov telescope array |
astro-h, the new japanese x-ray astronomy satellite following suzaku, is an international x-ray mission, planed for launch in feb, 2016. astro-h is a combination of high energy-resolution soft x-ray spectroscopy (0.3 - 10 kev) provided by thin-foil x-ray optics and a micro-calorimeter array, and wide band x-ray spectro... | the astro-h x-ray observatory |
we present the young stellar object variability (ysovar) data for ngc1333. there are 701 objects (see table1) with mid-infrared light curves in one or both warm spitzer bands. all ysovar spitzer light curve tabular data are available via the ysovar data delivery to the infrared science archive (irsa; http://irsa.ipac.c... | vizier online data catalog: ysovar: infrared photometry in ngc 1333 (rebull+, 2015) |
the imaging atmospheric cherenkov technique (iact) has provided very important discoveries in very high energy (vhe) γ-ray astronomy for the last two decades, being exploited mainly by experiments such as h.e.s.s., magic and veritas. the same technique will be used by the next generation of γ-ray telescopes, cherenkov ... | on-site mirror facet condensation measurements for the cherenkov telescope array |
grb 120326a was discovered by the swift burst alert telescope (bat) on 2012 march 26 at 01:20:29 ut. spectroscopic observations at the 10.4m gran telescope canarias provided a redshift of z=1.798 (tello et al. 2012gcn..13118...1t). the burst also triggered the fermi gamma-ray burst monitor (gbm) at 01:20:31.51 ut. the ... | vizier online data catalog: grb 120326a, 100418a & 100901a multi-wavelength obs. (laskar+, 2015) |
sron netherlands institute for space research and the anton pannekoek institute for astronomy of the university of amsterdam have organised the 11th integral conference. the meeting focused on the astrophysics of highly energetic phenomena that are observed with integral, taking into account advanced modelling and obse... | the 11th integral conference: gamma-ray astrophysics in multi-wavelength perspective |
in astronomy and astrophysics, x-ray emissions from cosmic entities aid in revealing what type of sources they emanate from. swift, nasa’s latest x-ray satellite, has not been operating at its intended configurations. the satellite is experiencing difficulties maintaining a stable temperature in its charge capture devi... | comparing data from telescopic x-ray instruments: can we trust all satellites? |
the recent generation of high energy observatories has enabled unprecedented progress to be made in our understanding of astrophysics in the x-ray domain. current technical evaluations suggest that the xmm-newton spacecraft and its scientific instruments may continue to provide first class x-ray observations well into ... | xmm-newton: the next decade |
scientific project gamma-400 (gamma astronomical multifunctional modular apparatus) relates to the new generation of space observatories intended to perform an indirect search for signatures of dark matter in the cosmic-ray fluxes, measurements of characteristics of diffuse gamma-ray emission and gamma-rays from the su... | the structure, logic of operation and distinctive features of the system of triggers and counting signals formation for gamma-telescope gamma-400 |
we analyse a recent realistic radiative mhd simulation of the solar corona that was computed with the extended version of the muram code. the simulation covers the uppermost 8mm of the solar convection zone and reaches 115mm into the solar corona. the simulation covers 48 hours of solar time and simulates the evolution... | numerical mhd coronal simulations: energy statistics and forward analysis. |
we present results of our analysis of c and l band observations of the grand design spiral galaxy, m83 made with the karl g. jansky very large array (vla). with recent optical (hst) and x-ray (chandra) observations and utilizing the newly expanded bandwidth of the vla, we are exploring the radio spectral properties of ... | identifying hidden supernova remnants in m83 with the vla |
dampe (dark matter particle explorer) is one of the five satellite missions in the framework of the strategic pioneer research program in space science of the chinese academy of sciences (cas). launched on december 17th 2015 at 08:12 beijing time, it is taking data into a sun-synchronous orbit, at the altitude of 500km... | dampe: a gamma and cosmic ray observatory in space |
the observations were obtained with the karl g. jansky vla of the national radio astronomy observatory. two frequency sub-bands, each 1ghz wide, and centered at 4.5 and 7.5ghz, respectively, were recorded simultaneously. the observations were obtained on three different epochs (2011 february 17/19, april 3/4, and may 4... | vizier online data catalog: gould's belt vla survey. i. ophiuchus complex (dzib+, 2013) |
next generation ground-based vhe gamma-ray observatories such as the cherenkov telescope array (cta) will employ an array of different sized iacts distributed across square kilometer areas. during 2015-2016, the cta-us collaboration is constructing a prototype 9.6 m primary diameter schwartzchild-couder iact (sct) at t... | construction of prototype two-mirror schwartzchild-couder imaging air cherenkov telescope (iact) for vhe gamma-ray astronomy |
chandra x-ray observatory revolutionized the x-ray astronomy as being the first, and so far the only, x-ray telescope achieving sub-arcsecond resolution. chandra comprises of three principal elements: the high resolution mirror assembly (hrma), pointing control and aspect determination (pcad) system, and the science in... | chandra x-ray observatory optical axis and aimpoint |
hitomi was a japanese x-ray astronomy satellite launched february 17, 2016. the space observatory was designed to perform imaging and spectroscopy in the hard x-ray band above 10 kev. it was hoped these measurements could provide insight into the evolution of galaxy clusters and the large-scale structure of the univers... | high cadence photometry of the tumbling hitomi x-ray satellite |
the smithsonian astrophysical observatory (sao) proposes a two year program to further advance the scientific capabilities of monolithic cmos detectors for use as x-ray imaging spectrometers. this proposal will build upon the progress achieved with funding from a previous apra proposal that ended in 2013. as part of th... | advancing the technology of monolithic cmos detectors for their use as x-ray imaging spectrometers |
vast amount of information continuously accumulated in astronomy requires finding new solutions for its efficient storage, use and dissemination, as well as accomplishing new research projects. virtual observatories (vos) have been created in a number of countries to set up a new environment for these tasks. based on t... | armenian virtual observatory |
previously used mirror technologies are not able to fulfil the requirements of future x-ray telescopes due to challenging requests from the scientific community. consequently new technical approaches for x-ray mirror production are under development. in europe the technical baseline for the planned x-ray observatory at... | the challenge of developing thin mirror shells for future x-ray telescopes |
taurus hill observatory (tho), observatory code a95, is an amateur observatory located in varkaus, finland. the observatory is maintained by the local astronomical association warkauden kassiopeia. tho research team has observed and measured various stellar objects and phenomena. observatory has mainly focused on exopl... | taurus hill observatory scientific observations for pulkova observatory during the 2016-2017 season |
hitomi (astro-h) is an x-ray observatory developed by an international collaboration led by jaxa. an x-ray microcalorimeter onboard this satellite has opened a new window of high-resolution spectroscopy with an unprecedented energy resolution of 5 ev (fwhm) at 6 kev. the spacecraft was launched on february 17, 2016 fro... | hitomi x-ray astronomy satellite: power of high-resolution spectroscopy |
ngc 4258 is a seyfert 1.9 galaxy known to contain a warped inner (0.3 pc) rotating disk of water-vapor masers which allowed for the first high accuracy measurements of the mass of a supermassive black hole in any galaxy. a relativistic jet is thought to be responsible for anomalous radio-continuum spiral arms, which ap... | [cii] emission from ngc 4258 with sofia/fifi-ls |
the sources of the highest-energy particles in the universe remain an unresolved mystery. the reason is that charged-particle astronomy is severely complicated by magnetic deflections. i will discuss the phaestos project - a radically new approach to charged-particle astronomy: constructing a 3-dimensional map of the g... | phaestos: using galactic magnetic tomography to enable charge particle astronomy and electromagnetically probe cosmic-ray composition at the highest energies |
the cherenkov telescope array (cta) will be the next generation ground-based observatory for gamma-ray astronomy at very-high energies. cta will consist of two large arrays with 118 cherenkov telescopes in total, deployed in the northern and southern hemispheres. the observation execution system (oes) provides the mean... | prototyping the central control system for the cherenkov telescope array |
gamma-ray and neutron spectrometers (grns) can be used to determine the hydrogen content and elemental abundances within the top several tens of centimeters of planetary surfaces. through the use of a dt (deuterium-tritium) pulsed neutron generator (png) grns can more rapidly characterize a planet's outermost crustal l... | active interrogation of analog planetary surfaces using neutron and gamma-ray instruments |
2019 marks the 40th anniversary of the discovery that jupiter produces bright and dynamic x-ray emissions [metzger et al. 1983]. in the subsequent decades, these high energy emissions have been used to study jupiter's aurorae, io plasma torus, atmosphere and the galilean satellites [e.g. gladstone et al. 2002; elsner e... | a new view of jupiter's x-ray aurora through juno, chandra and xmm-newton |
over the last several decades, a wealth of observations of gamma-ray emission at tev energies has increased our understanding of the extreme physical processes happening in our galaxy. however, fundamental questions remain unanswered. to how high an energy are cosmic rays able to be accelerated in our galaxy, and how d... | search for pev gamma rays with the icecube observatory |
this paper presents a new method to model x-ray scattering on random rough surfaces. it combines the approaches we presented in two previous papers - pz&lvs1& pz.2 an actual rough surface is (incompletely) described by its power spectral density (psd). for a given psd, model surfaces with the same roughness as ... | x-ray scattering from random rough surfaces |
taurus hill observatory (tho), observatory code a95, is an amateur observatory located in varkaus, finland. the observatory is maintained by the local astronomical association warkauden kassiopeia. tho research team has observed and measured various stellar objects and phenomena. observatory has mainly focused on exopl... | exoplanet observations in taurus hill observatory - history and current activities |
the beatrix (beam expander testing x-ray) facility is now under construction at inaf-brera astronomical observatory with the support of esa. we aim to use it as a pathfinder to demonstrate the feasibility of the acceptance tests of the athena's silicon pore optics mirror modules (mm), i.e., point spread function and ef... | beatrix, the beam expander testing x-ray facility for testing athena's spo modules: the collimating mirror |
historically discovered in the radio domain, pulsars have been observed at different energies, from the infrared to the very high-energy gamma-rays, following the progress of ground and space-based observing facilities and of detector technology. their study was pursued using different techiques, such as imaging, spect... | multi-wavelength polarimetry of pulsars |
the gamma-ray energy range from several hundred kev to a hundred mev has remained largely unexplored since the observations by instruments on the compton gamma-ray observatory (1991- 2000) and on integral (since 2002). this energy range is particularly challenging because it is firmly in the compton-dominated regime wh... | evaluation of the scientific capabilities of the amego instrument |
the southern wide-field gamma-ray observatory (swgo) is a project by scientists and engineers from 14 countries and 78 institutions to design and build the first wide-field, ground-based gamma-ray observatory in the southern hemisphere, with high duty cycle and covering an energy range rom hundreds of gev to the pev sc... | an update on site search activities for swgo |
this year (2019) nasa's chandra x-ray observatory will celebrate its20th anniversary of very successful scientific exploration of the highenergy universe. chandra revolutionized the x-ray astronomy as beingthe first, and so far the only, x-ray telescope achievingsub-arcsecond spacial resolution. chandra is comprised of... | chandra x-ray observatory optical axis and aimpoint |
the new generation research experiments will introduce huge data surge to a continuously increasing data production by current experiments. this data surge necessitates efficient compression techniques. these compression techniques must guarantee an optimum tradeoff between compression rate and the corresponding compre... | polynomial data compression for large-scale physics experiments |
the cherenkov telescope array (cta) will be the future observatory for tev gamma-ray astronomy. in order to increase the sensitivity and to extend the energy coverage beyond the capabilities of current facilities, its design concept features telescopes of three diffierent size classes. based on the experience from h.e.... | actuator development at iaat for the cherenkov telescope array medium size telescopes |
this paper presents a new method to model x-ray scattering on random rough surfaces. it combines the approaches we presented in two previous papers -- \zs\cite{zhao03} \& \pz\cite{zhao15}. an actual rough surface is (incompletely) described by its power spectral density (psd). for a given psd, model surfaces with t... | x-ray scattering from random rough surfaces |
a variety of multipoint in-situ spacecraft missions have crossed the magnetopause, enabling the measurements of the micro-scale properties of magnetic reconnection. macro-scale and global properties however, have remained poorly studied since their first discovery in the 1970s. the cusp plasma imaging detector cubesat ... | the development of cubesat instruments to image magnetic reconnection |
the cherenkov telescope array (cta) will be the leading ground-base observatory for very high energy (vhe) {\gamma}-ray astronomy for the next decades. its southern site will host about 70 small sized telescopes (ssts) which will determine the cta sensitivity at {\gamma}-ray energies between 1 and 300 tev. one of the d... | muon tagging on the bee of chec-s - a compact high-energy camera for the cherenkov telescope array |
astronomy is by nature a visual science. the high quality imagery produced by the world's observatories can be a key to effectively engaging with the public and helping to inspire the next generation of scientists. creating compelling astronomical imagery can, however, be particularly challenging in the non-optical wav... | high energy vision: processing x-rays |
astro-colibri is an innovative tool designed for professional astronomers to facilitate the study of transient astronomical events. transient events - such as supernovae, gamma-ray bursts and stellar mergers - are fleeting cataclysmic phenomena that can offer profound insights into the most violent processes in the uni... | citizen science time domain astronomy with astro-colibri |
from the mt. john observatory, new zealand, we were so close to the center of the occultation path on 29 june 2015 utc that we observed a modest central flash from the focusing of starlight from a 12th-magnitude star. the star was one of the brightest ever in our years of continual monitoring that started in 2002. at t... | a central flash at an occultation of a bright star by pluto soon before new horizons' flyby |
tata institute of fundamental research (tifr) has a very long tradition of conducting space astronomy experiments. within a few years of the discovery of the first non-solar x-ray source in 1962, tifr leveraged its expertise in balloon technology to make significant contributions to balloon-borne hard x-ray astronomy. ... | space astronomy at tifr: from balloons to satellites |
the single-mirror small-sized telescope, or sst-1m, was originally developed as a prototype of a small-sized telescope for cta, designed to form an array for observations of gamma-ray-induced atmospheric showers for energies above 3 tev. a pair of sst-1m telescopes is currently being commissioned at the ondrejov observ... | mono and stereo performance of the two sst-1m telescope prototypes |
the cherenkov telescope array is the next generation of observatory using imaging air cherenkov technique for very-high-energy gamma-ray astronomy. its first prototype telescope is operational on-site at la palma and its data acquisitions allowed to detect known sources, study new ones, and to confirm the performance e... | deep unsupervised domain adaptation applied to the cherenkov telescope array large-sized telescope |
the gravitational-wave optical transient observer (goto, steeghs et al. 2022) performed a targeted observation in response to grb 231117a (laha et al., gcn 35071; navaneeth et al, gcn 35072) at 10:00:02 ut on 2023-11-17, starting approximately 7 hours after trigger. the observation consisted of a 4x90s exposure in the ... | grb 231117a: goto optical upper limits |
developed right at the beginning of the space age in the 1940s, the proportional counter was the first detector used in x-ray astronomy and stayed its workhorse for almost four decades. although the principle of such a detector seems to be rather simple, over time it underwent considerable performance improvements and ... | proportional counters and microchannel plates |
taiga is a hybrid observatory for gamma-ray astronomy at high energies in range from 10 tev to several eev. it consists of instruments such as taiga-iact, taiga-hiscore, and others. taiga-hiscore, in particular, is an array of wide-angle timing cherenkov light stations. taiga-hiscore data enable to reconstruct air show... | analysis of the hiscore simulated events in taiga experiment using convolutional neural networks |
we will describe the current status of the astri mini-array, under construction at the teide astronomical observatory in tenerife, spain. the final layout of the array will include nine small cherenkov telescopes covering an area of about 650 x 270 square meters. the astri telescopes adopt a dual-mirror schwarzchild-co... | the astri mini-array of cherenkov telescopes |
custom, large-format astronomical gratings are needed for future space observatories, as further emphasized by the 2020 nasa decadal survey priorities. their design requires (nano-)fabrication methods that are becoming increasingly complex. amongst the many challenges, aberration-control for future gratings requires th... | electron-beam enabled optics |
performance studies for x-ray missions require predictions of what observations with these instruments will look like at very high fidelity. we provide an overview of sixte, a generic multi-mission x-ray astronomy simulator developed over the past decade. select active and previous missions supported by sixte are, amon... | sixte - a generic x-ray mission simulator |
we describe the busot observatory, our project of a fully robotic autonomous telescope. this astronomical observatory, which obtained the minor planet centre code mpc-j02 in 2009, includes a 14 inch meade lx200gps telescope, a 2 m dome, a st8-xme ccd camera from sbig, with an ao-8 adaptive optics system, and a filter w... | the busot observatory: towards a robotic autonomous telescope |
we present the discovery of three new w uma systems by our group as a part of a photometric follow-up of variable stars carried out with the busot observatory 36 cm robotic telescope in collaboration with the x-ray astronomy group at university of alicante (alicante, spain). specifically we show the high limiting magni... | scientific results obtained by the busot observatory |
this thesis describes a study of the research conducted by myself during these years as a phd candidate working at the university of technology, sydney (uts) and the commonwealth scientifc and industrial research organisation (csiro). the thesis is divided in two main parts: the frst part is comprised of research analy... | radio afterglows of gravitational waves |
the intracluster medium (icm), a diffuse plasma comprising of the vast majority of the baryons in the universe, exists in a turbulent state in galaxy clusters. quantifying to what degree turbulence affects the icm is still underway. direct observation of turbulence, via velocity measurements, evades current x-ray obser... | can x-ray derived pressure maps constrain turbulence in the intracluster medium? |
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