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the magellanic stream and its leading arm form a massive, filamentary system of gas clouds surrounding the large and small magellanic clouds. here we present a new component-level analysis of the stream's ultraviolet (uv) kinematic properties using a sample of 39 sightlines through the magellanic system observed with t... | kinematics of the magellanic stream and the imprint of a galactic center flare |
supernovae (sne) of type ib/c are believed to mark the deaths of massive stars that are stripped of their hydrogen (type ib), and possibly helium (type ic), envelope before explosion. this proposal focuses on a particular sub-class of ib/c sne called broad-line (bl) type ic, that provide us with a special window into t... | unraveling the physics of engine-driven sne with ztf+chandra |
the calorimetric electron telescope (calet) is a payload on the international space station (iss). calet has been observing cosmic rays and gamma-rays since october 2015. the calorimeter (cal), the primary instrument of calet to observe cosmic rays and gamma-rays directly in space, has collected gamma-ray data for more... | five years of gamma-ray observation with calet |
magnetic field plays an essential role in the plasma dynamics and particle acceleration in high-energy astrophysical systems. polarization offers a direct view of the magnetic field morphology and evolution in these systems. a regime yet to be explored is the high-energy polarimetry. mev polarimetry offers unique insig... | scientific potentials for mev polarimetry |
this technology advancement proposal will develop already mature silicon (si) technologies in ground-based detectors for use on space-based instruments. the particle physics community is developing monolithic (combined readout and detector medium) cmos (complementary metal-oxide-semiconductor) si pixel detectors with i... | astropix: developing silicon pixel detectors for gamma-ray and cosmic-ray astrophysics |
we describe glowbug, a gamma-ray telescope for bursts and other transients in the 30 kev to 2 mev band. it was recently funded by the nasa astrophysics research and analysis program, with an expected launch in the early 2020s. similar in concept to the fermi gamma burst monitor (gbm) and with similar sensitivity, glowb... | glowbug, a gamma-ray telescope for bursts and other transients (including tgfs!) |
the new field of multi-messenger astrophysics adds gravitational waves to the detection of electromagnetic signals, enabling us to gain previously unavailable insights about our universe. it started with the detection in multiple wavelengths of the neutron star merger (gw/grb 170817a), and proved its extraordinary pote... | numerical simulations of realistic binary neutron stars |
hurley was known for his discovery of transient repeating gamma ray bursts, which are now identified as magnetars. he also was the principal investigator for the solar and cosmic gamma-ray burst experiment aboard nasa's ulysses mission. | obituary: kevin c. hurley (1942-2021) |
the nuclear spectroscopic telescope array (nustar) has enabled studies of the local active galactic nuclei (agn) to extend into the spectral window above 10 kev with unprecedented spatial resolution and two orders of magnitude better sensitivity than any other instrument operating in that energy range. as a part of its... | obscuring torus geometry from the nustar survey of swift/bat agn |
superconducting qubits suffer from decoherence caused by phonons in the substrate with energies higher than the superconducting bandgap. while radiation backgrounds and cosmic rays produce large bursts of athermal phonons that causes catastrophic whole-chip failures, other sources, such as stress in films and chip pack... | reducing phonon backgrounds for quantum computing and cryogenic calorimeters |
terrestrial gamma ray flashes (tgfs) are bursts of high-energy photons lasting less than 100 μs [fishman et al., jgr, 116, a07304, 2011]. they are produced in common thunderstorms [e.g., chronis et al., bams, 97, 639, 2016 ; splitt et al., jgr, 115, a00e38, 2010] and briggs et al. [jgr, 118, 3805-3830, 2013] estimated ... | radiation risk assessment associated with tgfs for aircraft passengers: estimations of the probability for a commercial flight to be hit by a tgf |
one of the goals of nuclear astrophysics is to understand the various astrophysical events occurring in the cosmos. the most common stellar explosions observed in our galaxy are typei x-ray bursts (xrb1). the isotopic abundances obtained from the astrophysical models of xrb1 depend strongly on a number of nuclear react... | study of the 60ga(β+)60zn decay of for the astrophysical rp process |
gamma-ray bursts (grbs) are some of the most energetic explosions in the universe, releasing energies on the order of 1052 ergs, within a fraction of a second to minutes in the form of gamma rays. to understand the intrinsic properties of these bursts we must first determine the distance at which these bursts occur usi... | a probabilistic approach to estimating the unknown redshifts of batse catalog long-duration gamma-ray bursts |
our sample includes only the redshift-known long grbs observed with swift/bat from 2005 january to 2015 april. low-luminosity grbs are excluded since they may belong to another distinct population (e.g., chapman et al. 2007mnras.382l..21c; liang et al. 2007apj...662.1111l; lu et al. 2010apj...725.1965l). although the d... | vizier online data catalog: cosmic evolution of long gamma-ray burst luminosity (deng+, 2016) |
the largest amount of antineutrinos detected about the earth is emitted by the natural radioactive decays of 232th and 238u chains isotopes and of 40k. other flux components are yielded by cosmic rays interactions in the atmosphere or by possible extra-terrestrial sources such as supernovae explosions, gamma ray bursts... | study of antineutrinos from the earth and the cosmos with the borexino detector |
using the texas petawatt laser (tpw) to irradiate thick au and pt targets at 1021 w.cm-2 and above, we have created high-density, short-pulse (100 fs) electron, positron and gamma-ray jets with in-situ physical parameters comparable to those found in cosmic gamma-ray bursts. for cm-sized targets, we discover that the h... | creating laboratory gamma-ray bursts with 1021 w.cm-2 laser |
gamma-ray bursts (grbs) are detected in a broad redshift range. the cosmic evolution of grb luminosity is essential for revealing the grb physics and using grbs as cosmological probes. we characterize the intrinsic cosmological evolution of long grb luminosity as l=l0 (1+z)^k, and measure the k value with the non-param... | cosmic evolution of long gamma-ray burst luminosity |
γ-ray astronomy in the energy range from mev to gev can provide a unique detection window for γ-ray bursts and other transient sources, fundamental information on particle acceleration mechanisms, mev-blazar population studies up to z ~ 4.5, and a full overview of line emission from cosmic-ray interaction. silicon-base... | a multimission method for the reconstruction of gamma-ray events on silicon tracker pair telescopes |
mhd turbulence describes dynamics of astrophysical plasmas on large scale. it is characterized by energy transfer between different scales and the exchange of energy with nonthermal population - typically cosmic rays. recent progress in theory regarding almost all basic regimes of turbulence - from the dynamo to the de... | particle acceleration in mhd turbulence |
short-duration gamma-ray bursts are supposed to be stellar explosions having t_{90} duration less than 2 sec. the duration t_{90} is defined as he time over which a burst emits from 5% of its total measured counts to 95%. these bursts were observed so far at comparatively lower redshifts (z < 1.5) and lower energies... | short-duration gamma-ray bursts |
studying the components of the universe has been a mesmerizing topic of study for many years. with constant evolvement to the knowledge humans possess today, it is important to continue discovering and revising what is known about the universe. cosmic rays are energized subatomic particles that persistently burst throu... | measuring cosmic rays and their effect on the atmosphere |
until the discovery of gamma-ray bursts, supernovae were the most powerful explosions known in the universe. supernovae have a long history in the astronomy community with both detailed observational and theoretical studies focused on pinning down the engines to these cosmic explosions. gamma-ray bursts are more exotic... | understanding the engines behind cosmic explosions: advice from willem of occam and t.h. white |
gamma-ray bursts represent unique tools to study the early phases of cosmic evolution, the formation of the first stars and galaxies. absorption line spectra of these sources located in the epoch of reionization might provide us with key information about these remote, and yet fundamental, stages of cosmic history. i w... | first stars, reionization and gamma-ray bursts |
long -ray bursts (grbs) have been found in association with supernovae (sne) since the emblematic case of the grb 980425/sn 1998bw. the grb emission can be detected up to and their sn counterpart has been observed up to . correlations between grb-sn observables could be useful, e. g. in determining extragalactic distan... | correlations for cosmology from the homogenization of grb-associated supernova observations |
the relec scientific instrumentation onboard the vernov spacecraft launched on july 8, 2014, included the drge gamma-ray and electron spectrometer. this instrument incorporates a set of scintillation phoswich detectors, including four identical x-ray and gamma-ray detectors in the energy range from 10 kev to 3 mev with... | cosmic gamma-ray bursts detected in the relec experiment onboard the vernov satellite |
photoionization fronts play an important role in many astrophysical environments, including the development of galactic structure at the end of the cosmic dark ages and the formation of stellar-wind bubbles around o-type stars. despite their importance, predictions of photoionization front behaviour have yet to be test... | design of a pulsed-power driven platform to study photoionization fronts in the laboratory |
several factors contribute to the emergence and development of life on planets. in addition to local factors (e.g. intrinsic planetary properties and host-star characteristics), planetary habitability can be influenced by the larger scale radiation environment of the galaxy. powerful astrophysical transient sources of ... | the best place and time to live in the milky way |
cosmological models with different equations of state from the λ cold dark matter (λcdm) are at the center of the debate between the data of sne type ia and the planck data from the cosmic microwave background. thus, adding cosmological probes observed at high redshift is desired. gamma-ray bursts (grbs) are ideal cand... | gamma-ray bursts cosmology with the x-ray fundamental plane relation |
we present summary results from the first catalog of terrestrial gamma-ray flashes (tgfs) detected with the gamma-ray burst monitor (gbm) on the fermi space telescope. the catalog reports parameters for over 2700 tgfs. since the launch of fermi in 2008 the tgf detection sensitivity of gbm has been improved several time... | the first fermi gamma-ray burst monitor (gbm) terrestrial gamma-ray flash (tgf) catalog |
a particularly impressive far-ultraviolet flare (corresponding to a goes x25,000-class event: 50 is largest ever recorded on the sun) was captured serendipitously by hubble's cosmic origins spectrograph, during a campaign on young (~50 myr) solar analog ek draconis. the large outburst was like a classical solar 2-ribbo... | a giant far-ultraviolet flare on young solar analog ek draconis |
episodic eruptions of accretion disks of agns (and blazars) due to the magneto-rotational-instability are related to the excitation of intense alfven waves and their subsequently mode converted em pulses. these intense pulses are related to the emission of bursts of gamma rays and extreme high energy cosmic ray (ehecr)... | high energy photon emission from wakefields and its signatures in astrophysical blazars |
gamma-ray bursts constitute one of the most fascinating and relevant phenomena in modern science, with strong implications for several fields of astrophysics, cosmology and fundamental physics. in this short review, i focus on the prospective key-role of grbs for cosmology. indeed, the huge luminosity, the redshift dis... | cosmology wirh gamma-ray bursts |
discovery of two giant structures seen in gamma-rays and radio, located above and below the galactic center, known as fermi bubbles, can be considered as one of the most interesting phenomena observed by fermi-lat. their position and total energy content suggest a very strong energy outburst happened in the galactic ce... | fermi bubbles, their origin and possible connection to cosmic rays near the earth |
uffo burst alert and trigger telescope (ubat) is the x-ray trigger telescope of uffo/lomonosov to localize x-ray source with coded mask method and x-ray detector. its xray detector is made up of 36 8×8 pixels yttrium oxyorthosilicate (y2sio5:ce, yso) scintillation crystal arrays and 36 64-channel multi-anode photomulti... | cosmic ray effect on the x-ray trigger telescope of uffo/lomonosov using yso scintillation crystal array in space |
various 14c excursions apparently caused by an increase of incoming cosmic rays on a short time-scale found in the late holocene have generated widespread interest and have been reproduced in many different tree-ring records (miyake et al. 2012, 2013 2017; büntgen et al. 2018). the excursions at ad 774-775ad 993-994 ar... | annual carbon-14 variability in tree-rings: causes and implications for the calibration curve |
the gamma-400 project will be the new generation of satellite gamma-observatory. gamma-400 space-based gamma-ray telescope represents the core of the scientific complex intended to perform a search for signatures of dark matter in the cosmic gamma-emission, measurements of diffuse gamma-emission characteristics, invest... | the beam test of anticoincidence scintillation detector prototype with sipm readout and perspectives of grbs studies for space-based gamma-ray telescope gamma-400 |
point sources that produce high energy neutrinos remain elusive. while multiple studies have focused on high energy cosmological phenomenon such as gamma ray bursts, few have looked for correlation with local superstructures like the supergalactic plane that can produce these neutrinos not only directly but also throug... | search for neutrinos from the supergalactic plane |
los alamos national laboratory (lanl) has a long history of discovery in gamma-ray astronomy, from the first detection of gamma-ray bursts by the vela satellites to extensive involvement in nasa's highly successful swift and fermi missions. looking to the future, several exciting new opportunities are being pursued, le... | experimental gamma-ray astronomy at los alamos national laboratory |
with ratan-600 radio telescope we can conduct studies of pulsed radiation of events associated with fast radio bursts (frb), giant pulses (gp) of pulsars and flare activity of magnetars at high frequencies. now the telescope has been equipped with full-power radiometers with the highest possible time resolution and ban... | fastly varying objects: fast radio bursts, magnetars, and pulsars with ratan-600 |
a future medium-energy gamma-ray (mev) mission will address many questions posed in the recent astro2020 decadal survey in both the new messengers and new physics and the cosmic ecosystems themes. gamma-ray observations were critical to understanding the underlying physical phenomena driving extremely energetic sources... | compair: a next generation medium energy gamma-ray telescope prototype |
skyhopper is a proposed cubesat mission to simultaneously observe 4 bands in the wavelength range from 0.8 to 1.7 micron. the light is captured by a telescope with a 100 mm × 200 mm primary and a field of view of 0.6° × 2.6°. a preliminary definition (phase b) of the optical telescope assembly for the mission is now co... | skyhopper cubesat: a multi-band nir telescope for precise intensity measurements |
mergers of two compact objects, either two neutron stars (nss) or a ns and a stellar mass black hole (bh), are astrophysical sources of great interest. their observations enable for multi-disciplinary studies encompassing several key fields of modern astronomy: from the cosmic production of heavy metals to the formatio... | mapping the diversity of kilonovae through rapid hubble observations of a short gamma-ray burst |
the gamma ray polarimeter experiment (grape) is designed to investigate one of the most exotic phenomena in the universe - gamma-ray bursts (grb). there has been intense observational and theoretical research in recent years, but research in this area has been largely focused on studies of time histories, spectra, and ... | the development of a low energy compton imager for grb polarization studies |
the position of the jwst in space—close to the l2 point at a distance of 1.5 million kilometers from earth—allows us a unique chance to measure the speed of cosmic photons through a double detection in two different telescopes. the speed of cosmic photons has been considered constant as a matter of principle, but in th... | measuring the velocity of cosmic photons |
x-ray quasi-periodic eruptions (qpes) are a new kind of cosmic signal, detected for the first time in the nucleus of the galaxy gsn 069 (miniutti et al. 2019, nature 573, 381), and then observed by multiple x-ray telescopes in the nuclei of other four low-mass galaxies. x-ray qpes appear as rapid bursts of soft x-ray e... | unexpected signals in the x-ray sky: quasi-periodic eruptions from galactic nuclei |
we use a sample of 22 swift and fermi short gamma-ray bursts (sgrbs) to test the validity of the amati and yonetoku correlations, which were originally found for long bursts. the first relationship is between e_{p,i}, the intrinsic peak energy of the grb prompt emission, and e_{iso}, the equivalent isotropic energy. th... | testing the amati and yonetoku correlations for short gamma-ray bursts |
neutron stars with very strong magnetic fields are known as magnetars. there are multiple theories that predict magnetars may be able to emit high-energy (he) neutrinos through hadronic processes by accelerating cosmic rays to high energies. a subclass of magnetars known as soft gamma-ray repeaters (sgrs) can produce g... | search for high-energy neutrinos from magnetars with icecube |
the eclairs instrument onboard the french-chinese svom satellite is designed to detect gamma-ray bursts, which are the main objectives of the mission scheduled for operations after 2023. this instrument, developed in france, is a coded-mask telescope operating in the energy range between 4 and 150 kev. in order to be s... | eclairs image trigger performance studies using simulated and thermal vacuum test data |
nimble is a nasa explorer class mission concept that couples a very wide-field gamma ray monitor with a multiwavelength telescope and rapid response spacecraft. the primary mission science is focused on detection and characterization of compact binary mergers (most likely binary neutron star or neutron star/black hole)... | gravitational wave counterparts with the nimble mission concept |
although batse ceased to function in 2000, its catalog of grbs remains a large and valuable collection of uniform grb data. unfortunately, only 12 batse grbs had measured spectroscopic redshifts. to help make batse data even more useful, we have computed redshift estimates for 1366 batse individual long-duration gamma-... | a catalog of estimated redshifts for 1366 batse long-duration grbs from a monte carlo fit to brightness, hardness, and duration data |
transonic plasma winds are studied under the influence of gravitational potential well in the presence of cosmic rays and self excited alfvén waves. we present interesting features of transonic winds originating from the gravitational potential well for a three-fluid system. the model is comprising of thermal plasma, c... | transonic plasma winds with cosmic-rays and waves |
linearly polarized optical emission from a gamma-ray burst reveals the presence of a large-scale distorted magnetic field in the heart of this powerful cosmic explosion. | anatomy of a gamma-ray burst |
the on-off problem, aka. li-ma problem, is a statistical problem where a measured rate is the sum of two parts. the first is due to a signal and the second due to a background, both of which are unknown. mostly frequentist solutions are being used that are only adequate for high count numbers. when the events are rare ... | on the on-off problem: an objective bayesian analysis |
short duration gamma-ray bursts (grbs) are brief and intense flashes of gamma-ray radiation located at cosmological distances. nasa s swift mission provided the first breakthrough observations connecting these high-energy transients to the coalescence of two compact objects, either two neutron stars (nss) or a ns and a... | a missing population of short duration gamma-ray bursts |
the gamma ray polarimeter experiment (grape) is designed to investigate one of the most exotic phenomena in the universe - gamma-ray bursts (grb). there has been intense observational and theoretical research in recent years, but research in this area has been largely focused on studies of time histories, spectra, and ... | a low energy compton imager for grb polarization studies |
the transient high-energy sky and early universe surveyor (theseus) is a space missionconcept, developed by a large international collaboration and recently selected by esafor a phase 0/a study within the cosmic vision - m5 selection process. theseus aims atexploiting gamma-ray bursts for investigating the early univer... | the transient high energy sky and early universe surveyor (theseus) |
monitors of x-ray emission are important instruments for observing the long-term activity of cosmic sources on the long timescales (e.g. years). we show the perspectives and possibilities of observing the selected types of x-ray binary sources with the planned satellites theseus and extp. the hardness of the x-ray spec... | investigation of the long-term activity of the binary x-ray sources with the planned satellites |
one of the most computationally demanding aspects of the hydrodynamical modelingof astrophysical phenomena is the transport of energy by radiation or relativistic particles. physical processes involving energy transport are ubiquitous and of capital importance in many scenarios ranging from planet formation to cosmic s... | diaphane: a portable radiation transport library for astrophysical applications |
researchers searched the remains of an exploded star for signs of its one-time companion. though they found a suitable candidate, the star is in some ways an unlikely participant in a type ia supernova explosion.a companion to an exploding starillustrations of the two main type ia supernova pathways: the single-degener... | searching for a star that survived a supernova |
the cosmic gamma-ray bursts are certainly an enigma in astrophysics. the "standard fireball" scenario developed during many years has provided a possible explanation of this phenomenon. the aim of this work is simply to explore a new possible interpretation by developing a coherent scenario inside the global picture of... | gamma-ray bursts appear simpler than expected? |
over the last seven years, fermi-lat observations have convincingly found an excess in gamma-ray emission emanating from the center of the milky way galaxy. the excess has three definitive properties: (1) it has a hard spectrum that peaks at an energy of 2 gev, (2) it extends from within 0.1 degrees to more than 10 deg... | the gev excess in the galactic center |
arguably humans have flourished as a result of stellar explosions; we are, after all, stardust. nonetheless, rapid technology advances of the last 200 years sometimes put society and individuals on a collision course with the natural variability of stellar and solar atmospheres. human space exploration, routine satelli... | space weather: linking stellar explosions to the human endeavor |
during its 2-year baseline mission, the nuclear spectroscopic array (nustar) has carried out a survey of the galactic center region with total area coverage of ~0.7 deg2 and total exposure of ~2 msec. the nustar survey with ~40 ksec depth has detected over 30 point sources above 10 kev, including three known x-ray tran... | nustar galactic center survey |
the abundance of cosmogenic isotopes in natural samples is the main source of information about past variations of cosmic ray intensity, in the solar activity and in the strength of the geomagnetic field. sharp increases could originate from powerful impulsive events such as solar flares, gamma-rays from supernova expl... | impulsive event probability in the radiocarbon record in viii - xi centuries |
straw tube detector developed for the panda experiment in [1], will be used for tracking and identifcation of charged particles in the forward tracker (ft). the detector read-out will be incorporated in panda daq running in trigger-less mode by means of synchronization of data acquisition network (sodanet). sodanet is ... | study of the performance of prototypes of straw tube tracker by measuring cosmic rays |
for the first time since the discovery of high-energy cosmic neutrinos in icecube, a distant gamma ray blazar was identified as a high-energy neutrino source. the extraordinary brightness of the source despite its distance suggests that it may belong to a special class of sources that produce cosmic rays. moreover, the... | neutrino flares in the direction of txs 0506+056 |
thunderstorms emit bursts of energetic radiation. moreover, lightning stepped leader produces x-ray pulses. the phenomena, their interrelation and impact on earth's atmosphere and near space are not fully understood yet. the in-flight lightning strike damage assessment system ildas was developed in an eu fp6 project ( ... | lightning x-rays inside thunderclouds, in-flight measurements on-board an a350 |
over the last seven years, fermi-lat observations have convincingly found an excess in gamma-ray emission emanating from the center of the milky way galaxy. the excess has three definitive properties: (1) it has a hard spectrum that peaks at an energy of 2 gev, (2) it extends from within 0.1 degrees to more than 10 deg... | dark matter at the galactic center and the galactic center gamma-ray excess |
cosmic microwave background experiments make wide-area, sensitive, high- cadence maps of the sky at mm-wavelengths. discoveries will include moving (solar system objects), time-variable (stars, active galactic nuclei), or transient sources (novae, tidal disruption events, gamma-ray bursts, nearby supernovae, gravitatio... | tracking the time-variable millimeter-wave sky with cmb experiments |
the merger of binary neutron star encodes rich physics of extreme states of matter. probing it through gravitational-wave observations requires the detectors to have high sensitivity above 1 khz. here we propose a detector design that pushes down the high-frequency quantum noise with an active optomechanical filter, fr... | towards the design of gravitational-wave detectors for probing neutron-star physics |
terrestrial gamma-ray flashes (tgfs) are short burst of gamma radiation originating from thunderclouds; they are currently observed by the reuven ramaty high energy solar spectroscopic imager (rhessi) [smith et al., science, 2005], the fermi gamma-ray space telescope [briggs et al., jgr, 2010], the astrorivelatore gamm... | new design of agile selection criteria for tgfs |
two 14c excursions apparently caused by an increase of incoming cosmic rays on a short time scale found in the late holocene generated widespread interest and have been reproduced in many different tree-ring records. these excursions at ad 774-775 and ad 993-994 are usually explained as due to extreme solar proton even... | the expanding record of rapid carbon-14 excursions in tree-rings - what do they tell us? |
the all-sky medium energy gamma-ray observatory (amego) is a wide field of view instrument (~60 deg radius) with a broad energy range (~200 kev to >10 gev) and excellent continuum sensitivity, designed to address a broad range of astrophsical topics in this under-explored region of the em-spectrum. amego will also s... | advancing the mev frontier with amego |
nimble is a nasa explorer class mission concept that couples a very wide-field gamma ray monitor with a multiwavelength telescope and rapid response spacecraft. the primary mission science is focused on detection and characterization of compact binary mergers (most likely binary neutron star or neutron star/black hole)... | gravitational wave counterparts with the nimble mission concept |
argo-ybj (aielli et al. 2012nimpa.661s..50a) is an eas detector located at an altitude of 4300 m a.s.l. (atmospheric depth 606 g/cm2) at the yangbajing cosmic ray laboratory (30.11°n, 90.53°e) in tibet, p. r. china. the argo-ybj detector was completed in the spring of 2007; however, thanks to its modularity, the data c... | vizier online data catalog: gev gamma-ray bursts with the argo-ybj detector (bartoli+, 2014) |
we present results of the study of data of the monitoring of high-energy and thermal neutrons at tien shan at different stages of thunderstorm activity. the data of the neutron monitoring were used taking into account the barometric effect. the intensity of the neutron component of cosmic rays is recorded in seven ener... | response of thunderstorm activity in data of neutron monitoring at tien shan |
the swift active galactic nucleus (agn) and cluster survey (sacs) uses 125 deg^2 of swift x-ray telescope serendipitous fields with variable depths surrounding x-ray bursts to provide a medium depth (4 × 10^-15 erg cm^-2 s^-1) and area survey filling the gap between deep, narrow chandra/xmm-newton surveys and wide, sha... | the swift agn and cluster survey |
tidal disruption events (tdes) of stars by single or binary super-massive black holes illuminate the environment around quiescent black holes in galactic nuclei allowing to probe dorment black holes. we predict the tde rates expected to be detected by next-generation x-ray surveys. we include events sourced by both sin... | tidal disruption events across cosmic time |
recent results revealed the simultaneous existence of multiple components in the prompt emission of gamma-ray bursts (grbs) leading to a unified spectro-temporal model for the broadband spectrum from the optical regime up to higher gamma rays. unexpectedly, we discovered a relation intrinsic to one specific component o... | from a better understanding of grb prompt emission to a new type of standard candles? |
the surfaces of airless bodies, such as the moon and phobos (innermost martian moon), are directly exposed to the surrounding space environment, including energetic particle radiation from both the ever-present flux of galactic cosmic rays (gcrs) and episodic bursts of solar energetic particles (seps). characterizing t... | the effect of topography on the exposure of airless bodies to space radiation: phobos case study |
breathtaking results from the planck satellite mission and hubble space telescope have highlighted the key role modern astronomy is playing for our understanding of big bang cosmology. however, not so widely publicized is the similar wealth of observational data now available on explosive stellar phenomena, such as x-r... | advances in explosive nuclear astrophysics |
the galactic center (gc) supermassive black hole sgr a* radiates at a level about 9 orders of magnitude lower than its eddington luminosity. but indication of its glorious past has come from x-ray observations of surrounding giant molecular clouds. their varying neutral iron lines and continuum emission could be due to... | nustar observation of sgr b2: reflection of past sgr a* x-ray outburst, cosmic ray illumination or both? |
distribution of gamma-ray bursts (grbs) from catalogs of the batse and bepposax space observatories relative to the cosmic microwave background (cmb) data by planck space mission is studied. three methods were applied for data analysis: (1) a histogram of cmb signal values in grb directions, (2) mosaic correlation maps... | correlation between sphere distributions of gamma-ray bursts and cmb fluctuations |
heliospheric energetic particle populations of energies higher than 1 mev are studied using a 33 year long data record composed of hourly measurements, as extracted from the nasa goddard space flight center's omni data set. their periodicities are examined by means least-squares spectral analysis and wavelet analysis a... | study of heliospheric particle populations far from thermal equilibrium during three solar cycles, periodicities and q-index |
in complement to spectro-imaging observations, gamma-ray polarimetry provides a unique insight into the geometry and magnetic configuration of compact gamma-ray sources, such as neutron stars or black holes. due to the unprecedented spectral and timing capabilities of integral, and thanks to its coded mask imaging tech... | overview of recent integral polarimetric observations |
the study of cosmic gamma ray bursts (grbs) is one of the main goals of the lomonosov space mission. the main advantage of this mission is simultaneous multiwavelength observations of grbs covering the optical, x-ray and gamma-ray ranges. the mission payload includes the grb monitor bdrg, wide-field optical cameras sho... | observation of cosmic gamma ray bursts in the experiments onboard lomonosov and vernov satellites |
in 1994, a new type of radiation coming from the earth's atmosphere was discovered. this radiation, now known as terrestrial gamma-ray flashes (tgfs), comes in the form of bursts of high-energy photons, lasting less than one millisecond [fishman et al., science, 264, 1313, 1994]. initially expected to be rare events, w... | estimation of doses from electrons, photons, and secondary particles associated with tgfs |
when two ultra-compact objects inspiral and merge it is a rare cosmic event, resulting in ``luminous'' gravitational wave emission. it is also fleeting, staying in advanced ligo's current sensitive band only for at most a few minutes. but when there is at least one neutron star, disk formation during the merger may pow... | never ignore a coincidence: rapid identification of advanced ligo sources with electromagnetic transients |
the proposed model provides: 1 a predicted cosmological distribution of galaxies that requires no dark energy; 2 an observationally confirmed prediction that the historical location for the peak number of quasars, star formation rate, and gamma ray bursts will occur at a red shift factor of z =2; 3 and other prediction... | an intriguing cosmological model |
the nasa/asi imaging x-ray polarimetry explorer (ixpe) will be launched in spring 2021, and will allow to perform for the first time, thanks to its imaging-capable detectors, spatially resolved x-ray polarimetry of faint, extended sources. one of the most challenging, yet rewarding, targets are expected to be the molec... | x-ray polarimetry of faint extended sources: the case of the molecular clouds in the galactic center |
the swift agn and cluster survey (sacs) uses 125 deg^2 of swift x-ray telescope serendipitous fields with variable depths surrounding gamma-ray bursts to provide a medium depth (4 × 10^-15 erg cm^-2 s^-1) and area survey filling the gap between deep, narrow chandra/xmm-newton surveys and wide, shallow rosat surveys. he... | early results from swift agn and cluster survey |
in the 15 years since its construction, the h.e.s.s. gamma-ray observatory has allowed the study of the very high energy gamma-ray sky at unprecedented resolutions and sensitivities. during this period h.e.s.s. has discovered a rich zoo of both galactic and extra galactic cosmic ray sources. recent major discoveries in... | highlight from h.e.s.s. and implication for cta era |
on behalf of the rice-uta-mda positron-gamma-ray collaboration*, we report the latest results of the 2016-2018 dense gamma-ray and positron experiments. using the texas petawatt laser (tpw) to irradiate thick au and pt targets at intensities >=1021w / cm 2 , we have created high-density (1015 /cm3), short-pulse (100... | creating dense gamma-rays and electron-positron pairs with 1021w . cm - 2 short-pulse laser |
icecube was built at the south pole and aims to detect high energy neutrinos from the universe mainly above 100 gev. the transparent ice media allows us to build a 1 km3 large detection volume to detect the rarely interacting particles. neutrinos are thought to be generated at astrophysical sources such as active galac... | the latest icecube results and the implications |
the galactic center (gc) supermassive black hole sgr a* radiates at a level about 9 orders of magnitude lower than its eddington luminosity. but indication of its glorious past has come from x-ray observations of surrounding molecular clouds. their varying neutral iron lines and continuum emission could be due to refle... | nustar observation of galactic center molecular clouds: reconstructing sgr a* x-ray outburst history |
darts is the space science data archive at jaxa. maxi, monitor of all-sky x-ray, has been operational since august 2009 on the japanese experiment module-exposed facility (jem-ef) of the international space station (iss). calet (calorimetric electron telescope) was equipped on the jem-ef in 2015, and has been carrying ... | maxi and calet archives at darts |
the cadmium zinc telluride (czt) imager onboard astrosat, consists of pixelated czt detectors, which are sensitive to hard x-rays above 20 kev. the individual pixels are triggered by ionising events occurring in them, and the detectors operate in a self-triggered mode, recording each event separately with information a... | characterisation of cosmic ray induced noise events in astrosat-czt imager |
a gamma-ray burst, named grb 221009a, occurred on 9 october 2022 and is the brightest ever observed grb, whose frequency is now estimated as once in 10,000 years. this grb was reported to be observed from many space missions, vlf receivers, and ground observations in optical and radio data. additionally, a strikingly l... | effect of the brightest gamma-ray burst (grb 221009a) on low energy gamma-ray counts at sea level |
india has been actively involved in the follow-up observations of optical afterglows of gamma-ray bursts (grbs) for more than two decades, using the country's meter-class facilities such as the 1.04 m sampurnanand telescope, 1.3 m devasthal fast optical telescope, 2.01 m himalayan chandra telescope along with many othe... | recent observations of peculiar gamma-ray bursts using 3.6 m devasthal optical telescope (dot) |
fast radio bursts (frbs) are millisecond-duration radio signals from unknown cosmic origin. many models associate frbs with high-energy astrophysical objects such as magnetars. in this attempt to find counterparts to frbs, we explore gamma-ray bursts (grbs) from the swift and fermi missions. we first search for spatial... | all sky archival search for frb high energy counterparts with swift and fermi |
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