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long gamma-ray bursts (grbs) have been discussed as a potential tool to probe the cosmic star formation rate (sfr) for a long time. some studies found an enhancement in the grb rate relative to the galaxy-inferred sfr at high redshifts, which indicates that grbs may not be good tracers of star formation. however, in th... | the stellar-mass function of long gamma-ray burst host galaxies |
we studied the stability property of numerical cherenkov radiation in relativistic plasma flows employing particle-in-cell simulations. using the implicit finite-difference time-domain method to solve the maxwell equations, we found that nonphysical instability was greatly inhibited with a courant-friedrichs-lewy (cfl)... | stability property of numerical cherenkov radiation and its application to relativistic shock simulations |
in this work, by using strong gravitational lensing (sgl) observations along with type ia supernovae (union2.1) and gamma-ray burst data (grbs), we propose a new method to study a possible redshift evolution of γ(z), the mass density power-law index of strong gravitational lensing systems. in this analysis, we assume t... | constraints on a possible evolution of mass density power-law index in strong gravitational lensing from cosmological data |
in this work, using the gaussian process, we explore the potentiality of future gravitational wave (gw) measurements to probe cosmic opacity at high redshifts through comparing its opacity-free luminosity distance (ld) with the opacity-dependent one from the combination of type ia supernovae (snia) and gamma-ray bursts... | exploring the potentiality of standard sirens to probe cosmic opacity at high redshifts |
an extended framework of gravity, in which the first friedmann equation is satisfied up to some constant due to violation of gauge invariance, is tested against astrophysical data: supernovae type-ia, cosmic chronometers, and gamma-ray bursts. a generalized expression for the friedmann equation, including the possible ... | reference level of the vacuum energy density of the universe and astrophysical data |
in this paper, we perform a cosmological model-independent test of the cosmic distance-duality relation (cddr) in terms of the ratio of angular diameter distance (add) d = dasl/d as from strong gravitational lensing (sgl) and the ratio of luminosity distance (ld) d∗ = d ll/d ls obtained from the joint of type ia supern... | testing the distance-duality relation from strong gravitational lensing, type ia supernovae and gamma-ray bursts data up to redshift z ∼ 3.6 |
the swift active galactic nucleus (agn) and cluster survey (sacs) uses 125 deg2 of swift x-ray telescope serendipitous fields with variable depths surrounding γ-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, shal... | the swift agn and cluster survey. i. number counts of agns and galaxy clusters |
high-redshift primordial galaxies have recently been found with evolved stellar populations and complex star-formation histories reaching back to 250 myr after the big bang. their intense bursts of star-formation appear to be interspersed with sustained periods of strong quenching, however the processes underlying this... | cosmic rays as a feedback agent in primordial galactic ecosystems |
cosmic transients, such as gamma-ray bursts and fast radio bursts, have been used to constrain the einstein's equivalence principle (eep) through the parametrized-post-newtonian (ppn) formalism. in this approach, the time delay of photons with different energies from these cosmic transients are used to obtain upper bou... | cosmic transients, einstein's equivalence principle and dark matter halos |
this contribution describes the system performing the trigger and the readout of the pmts for the high energy particle detector (hepd-02) onboard the second satellite of the china seismo electromagnetic satellite (cses-02) mission. cses is a project developed to research the ionospheric perturbations associated with ea... | trigger and data acquisition system of the high energy particle detector on board the cses-02 satellite |
gribenski et al. (2016) investigated moraines of the chagan-uzun valley in the russian altai mountains, concluding from 18 cosmic-ray exposure ages that they slightly predated ∼19 ka, within mis 2. the moraines extended below the highest stand of the kuray/chuja palaeolakes that gave rise to outburst floods down chuja ... | comment on gribenski, n. et al., 2016. complex patterns of glacier advances during the late glacial in the chagan uzun valley, russian altai. quaternary science reviews 149, 288-305 |
comparing the parameterized post-newtonian parameter γ values for different types of particles, or the same type of particles with different energies is an important method to test the einstein equivalence principle (eep). assuming that the observed time delays are dominated by the gravitational potential of the laniak... | testing einstein's equivalence principle with supercluster laniakea's gravitational field |
the observation of complex organic molecules (coms) in the gas phase of cold molecular clouds has coined a freeze-out paradox in astrophysics: coms should be accreted on low-temperature interstellar grains, but not observable in cold molecular clouds. still, validated mechanisms transporting molecules from the grains b... | rapid radical-radical induced explosive desorption of ice-coated interstellar nanoparticles |
the grapes-3 muon telescope in ooty, india had claimed detection of a 2 hour (h) high-energy (∼20 gev ) burst of galactic cosmic-rays (gcrs) through a >50 σ surge in gev muons, was caused by reconnection of the interplanetary magnetic field (imf) in the magnetosphere that led to transient weakening of earth's magnet... | was the cosmic ray burst detected by the grapes-3 muon telescope on 22 june 2015 caused by a transient weakening of the geomagnetic field or by an interplanetary anisotropy? |
in this thesis a measurement of the high energy $\gamma$-ray flux between 200 mev and 1 tev with the alpha magnetic spectrometer is presented. the alpha magnetic spectrometer (ams-02) is a multi-purpose particle detector mounted externally on the international space station. although primarily designed for the measurem... | measurement of high energy gamma rays from 200 mev to 1 tev with the alpha magnetic spectrometer on the international space station |
in the cannonball model of gamma-ray bursts (grbs), a highly relativistic jet of plasmoids of ordinary stellar matter that is ejected during stellar collapse or shortly after by fallback matter, produces simultaneously a grb and a cosmic-ray burst by scattering light and charged particles in its path. this association ... | the maximum isotropic equivalent energy of gamma-ray bursts |
in recent years, remarkable progress has been achieved in the development of quantum computers. for further development, it is important to clarify properties of errors by quantum noise and environment noise. however, when the system scale of quantum processors is expanded, it has been pointed out that a new type of qu... | introduction to semi-classical analysis for digital errors of qubit in quantum processor |
the present work proposes a new formalism for the inner regions of a neutrino-dominated accretion flows (ndafs) by considering the self-gravity, where the neutrino opacity is high enough to make neutrinos trapped becoming a dominant factor in the transportation of energy and angular momentum over the magneto rotational... | grb variabilities and following gravitational waves induced by gravitational instability in ndafs |
the redshift and luminosity distributions of 36 swift short gamma-ray bursts (grbs) are fitted by connecting their event rates with cosmic star formation rates using power-law distributed delay times f(τ )\propto {τ }-1, where a broken-power-law luminosity function is assumed and some empirical observational selection ... | revisiting the event rate of short grbs and estimating their detectable number within the advanced ligo horizon |
gamma-ray bursts (grbs) are brief, intense, gamma-ray flashes in the universe, lasting from a few milliseconds to a few thousand seconds. for short gamma-ray bursts (sgrbs) with duration less than 2 seconds, the isotropic energy (e iso) function may be more scientifically meaningful and accurately measured than the lum... | the isotropic energy function and formation rate of short gamma-ray bursts |
the absorption of decimeter (dm) radio waves (wavelength ~19 cm) in the high-latitude lower ionosphere of the earth is found based on analysis of formosat-3/cosmic radio occultation data. a method is proposed to reconstruct the vertical profiles of the absorption coefficient by solving the inverse problem of radio soun... | the absorption coefficient of decimeter radio waves ( 19 cm) in the earth's ionosphere based on the inverse problem solution in radio occultation satellite studies during the june 2015 magnetic storm |
aims: low-mass galaxies radio observations show in many cases surprisingly high levels of magnetic field. the mass and kinematics of such objects do not favour the development of effective large-scale dynamo action. we attempted to check if the cosmic-ray-driven dynamo can be responsible for measured magnetization in t... | magnetic field evolution in dwarf and magellanic-type galaxies |
in this work, we use two gas mass fraction samples of galaxy clusters obtained from their x-ray surface brightness observations jointly with recent h(z) data in a flat λcdm framework to impose limits on cosmic opacity. {it is assumed that the galaxy clusters are in hydrostatic equilibrium and their gas mass fraction me... | x-ray surface brightness observations of galaxy clusters, cosmic opacity and the limits on the matter density parameter |
dios (diffuse intergalactic oxygen surveyor) is a small satellite aiming for a launch around 2022 with jaxa's epsilon rocket. its main aim is a search for warm-hot intergalactic medium with high-resolution x-ray spectroscopy of redshifted emission lines from ovii and oviii ions. the superior energy resolution of tes mi... | dios: the dark baryon exploring mission |
gamma-ray bursts (grbs) are extremely energetic events at cosmological distances. they provide unique laboratory to investigate fundamental physical processes under extreme conditions. due to extreme luminosities, grbs are detectable at very high redshifts and potential tracers of cosmic star formation rate at early ep... | gamma-ray bursts: a radio perspective |
on april 28, 2016, the lomonosov satellite, equipped with a number of scientific instruments, was launched into orbit. here we present briefly some of the results obtained with the first orbital telescope of extreme energy cosmic rays tus and by a group of detectors aimed at multi-messenger observations of gamma-ray bu... | first results of the lomonosov tus and grb experiments |
theseus is a space mission concept, currently under phase a study by esa as candidate m5 mission, aiming at exploiting gamma-ray bursts for investigating the early universe and at providing a substantial advancement of multi-messenger and time-domain astrophysics. in addition to fully exploiting high-redshift grbs for ... | the theseus space mission: updated design, profile and expected performances |
cosmic gamma-ray bursts (grbs) and soft gamma-ray repeaters (sgrs) are the brightest sources of high-energy electromagnetic radiation. for many years, grb and sgr studies have been among the major basic research areas at the ioffe institute. the physical processes that power immense luminosity of the cosmic gamma-ray s... | cosmic gamma-ray bursts and soft gamma-repeaters - observations and modeling of extreme astrophysical phenomena: (100th anniversary of the ioffe institute) |
the scientific instruments onboard the lomonosov satellite include a complete set of detectors designed to study the gamma and optical emission of cosmic gamma-ray bursts (grbs). the bdrg gamma spectrometer ensures producing a trigger of a grb and studying grb properties in the energy range of 10-3000 kev as well as de... | complete set of detectors for studying cosmic gamma-ray bursts onboard the lomonosov satellite |
short timescale variability is often associated with a black hole system. the consequence of an electromagnetic outflow suddenly generated near a kerr black hole is considered assuming that it is described by a solution of a force-free field with a null electric current. we compute charged particle acceleration induced... | particle acceleration driven by null electromagnetic fields near a kerr black hole |
the pamela and the arina experiments are carried out on the board of satellite resurs-dk1 since 2006 up to now. main goal of the pamela instrument is measurements of high energy antiparticles in cosmic rays while the arina instrument is intended studying high energy charged particle bursts in the magnetosphere. both of... | time variations of proton flux in earth inner radiation belt during 23/24 solar cycles based on the pamela and the arina data |
to use the luminous gamma-ray bursts and their afterglows as messengers from the early universe has been advocated ever since the discovery of the cosmological nature of the grb phenomenon in the late nineties. it took, however, until the advent of swift to detect high-redshift grbs in significant numbers, and to provi... | grb-selected galaxies through cosmic time |
in this work, we propose a modification of the e-model (cullen, neale, and lesser) mathematical model for aquatic photosynthesis to include the action of ionizing radiation. we evaluated, with this modified model, the perturbations that muons from neutron star fusions could cause in the biological process of aquatic ph... | perturbation to aquatic photosynthesis due to high energy muons from cosmic ray bursts due to neutron star mergers |
long-duration gamma-ray bursts (long-grbs) can be detected throughout cosmic history and provide several unique insights into star-formation and galaxy evolution back to the era of reionization. they can be used to map star formation, identify galaxies across the luminosity function, determine detailed abundances even ... | theseus and the high redshift universe |
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 phenomena. the aim of this work is simply to explore a new possible interpretation by developing a coherent scenario inside the global picture of ... | cosmic gamma-ray bursts from primordial stars: a new renaissance in astrophysics? |
the gamma-400 gamma-ray space-based telescope has as its main goals to measure cosmic γ-ray fluxes and the electron-positron cosmic-ray component produced, theoretically, in dark-matter-particles decay or annihilation processes, to search for discrete γ-ray sources and study them in detail, to examine the energy spectr... | method of incident low-energy gamma-ray direction reconstruction in the gamma-400 gamma-ray space telescope |
the author - with his collaborators - already in years 1995-96 have shown - purely from the analyses of the observations - that the gamma-ray bursts (grbs) can be till redshift 20. since that time several other statistical studies of the spatial distribution of grbs were provided. remarkable conclusions concerning the ... | spatial distribution of the gamma-ray bursts at very high redshift |
theseus is a space mission concept currently under phase a study by esa as candidate m5 mission, aiming at exploiting gamma-ray bursts for investigating the early universe and at providing a substantial advancement of multi-messenger and time-domain astrophysics. through an unprecedented combination of x-/gamma-ray mon... | the transient high-energy sky and early universe surveyor (theseus) |
we discuss likely sources of cosmic rays in the 1015 -1020ev range and their possible very high energy neutrino and gamma-ray signatures which could serve to identify these sources and constrain their physics. among these sources we discuss in particular low luminosity gamma-ray bursts, including choked and shock-break... | multi-messenger signatures of pev-zev cosmic ray sources |
the observations of grbs over many years are discussed. the main key steps in grb investigations are the following: the first simultaneous observations of grb720117 (cosmos-461 and vela); the first bimodal distribution's discussion in 1981 by mazets, golenetskii; the first grb with optical afterglow investigations grb9... | master and unsolved grb observational and theoretical problems |
the measurements of gamma-ray fluxes and cosmic-ray electrons and positrons in the energy range from 100 mev to several tev, which will be implemented by the specially designed gamma-400 gamma-ray telescope, concern with the following broad range of science topics. searching for signatures of dark matter, surveying the... | the gamma-400 gamma-ray telescope characteristics. angular resolution and electrons/protons separation. |
most of what is currently known about slow radio transients (supernovae, gamma-ray bursts, tidal disruption events, stellar flares, etc.) has come via radio follow-up of objects identified by synoptic telescopes at optical, x-ray or gamma-ray wavelengths. however, with the ability to capture obscured, unbeamed and magn... | exploring the dynamic radio sky |
indian centre for space physics has been flying low-cost mainly meteorological balloons (both rubber and polythene) for about 10 years and successfully completed 109 such missions. some of them even had multiple balloons in order to achive longer flights at specific heights. we carry main instruments (geiger counters, ... | low cost balloon borne science programme of icsp in near space and its future goals |
at 03:35:24 ut, the swift burst alert telescope (bat) triggered and located a marginal image peak (trigger=1144538). swift slewed immediately to the peak location. the bat on-board calculated location is ra, dec 54.789, -27.433 which is ra(j2000) = 03h 39m 09s dec(j2000) = -27d 25' 57" with an uncertainty of 3 arcmin (... | swift trigger 1144538 is not a grb |
a theory suggests our planet earth had an extreme cooling from 5.9 to 5.33 million years ago, a most extensive glaciation "miocene glacier" since the dinosaur's era. the cosmic ray outburst from sagittarius a, ca 6 mya, emerges as the leading cause. | did outburst of supermassive black hole sagittarius a cause an extreme glaciation on earth? |
improved atmospheric ionisation measurements are needed to help quantify relationships between atmospheric electricity, weather and climate. commercial interest in small particle detectors is also driving technical development of a novel scintillator-based energetic particle detector. this method is an improvement on o... | ionisation profile measured over the uk with novel energy-discriminating instrumentation |
the first stars in the first galaxies created the first nuclear-powered light, the first heavy metals, and reionized the intergalactic medium. we describe studies of x-ray sources in low-metallicity star-bursting dwarfs that are local analogs of the first galaxies. we review the effect of metallicity on x-ray binary po... | accreting compact objects at cosmic dawn |
we present a catalog of probabilistic redshift estimates for 1366 individual long-duration gamma-ray bursts (lgrbs) detected by the burst and transient source experiment (batse). this result is based on a careful selection and modeling of the population distribution of 1366 batse lgrbs in the five-dimensional space of ... | vizier online data catalog: 1366 lgrb redshifts estimates with barse (osborne+, 2020) |
following the classical works on neutron stars, black holes and cosmology, i outline some recent results obtained in the irap-phd program of icranet on the "cosmic matrix": a new astrophysical phenomenon recorded by the x- and gamma-ray satellites and by the largest ground based optical telescopes all over our planet. ... | cosmic matrix in the jubilee of relativistic astrophysics |
more than 60 grbs at z >~ 1.5 reside in the vicinity of dense, cold gas as probed by the measured neutral hydrogen via afterglow absorption spectroscopy. we present the largest sample of grb-dlas to date in comparison with a sample of dlas along quasars: the metallicity of the grb hosts represents a unique tool to u... | exploring the environment of the most powerful explosions |
the nuclear spectroscopic telescope array (nustar) has enabled studies of the local active galactic nuclei (agn) to extend into the hard x-ray band, up to 79 kev, with unprecedented spatial resolution and sensitivity. as a part of its extragalactic program, nustar is surveying the nearby population of agn detected at h... | hard x-ray spectroscopy of obscured agn with nustar |
lflgrb models the luminosity function (lf) of long gamma ray bursts (lgrbs) by using a sample of swift and fermi lgrbs to re-derive the parameters of the yonetoku correlation and self-consistently estimate pseudo-redshifts of all the bursts with unknown redshifts. the grb formation rate is modeled as the product of the... | lflgrb: luminosity function of long gamma-ray bursts |
accretion disks of neutron stars can be heavily irradiated by type i x-ray bursts, which significantly alter the disk structure. previous work simulated the time-dependent impact of the burst on the disk for a nonspinning neutron star. here, we study the impact of spin on the burst-disk interaction through relativistic... | impact of spin on the accretion disk response to a type i x-ray burst |
plasma with interpenetrating beams is known to exhibit electromagnetic instabilities such as the filamentation (e.g., weibel) instability. extreme astrophysical environments, such as in collisionless shocks of cosmic explosions - gamma-ray bursts and supernovae, are natural places where such beam-plasma instabilities n... | spectral analysis of pic simulations of interpenetrating plasmas |
it has been a long-standing challenge to probe cosmic-ray particles at thecenter of our galaxy. low energy cosmic-ray protons (lecrp) with energiesof mev to gev can produce 6.4 kev fe k-alpha line and continuum x-rayemission through interaction with cold molecular materials. the fe k-alphaemission from the densest gala... | probing galactic center mev-gev cosmic-ray population with sgr b2 fe k emission |
correlated neutron counting using multiplicity shift register logic extracts the first three factorial moments from the detected neutron pulse train. the descriptive properties of the measurement item (mass, the ratio of (α,n) to spontaneous fission neutron production, and leakage self-multiplication) are related to th... | neutron triples counting data for uranium |
plasma with interpenetrating beams is known to exhibit instabilities such as the filamentation and two-stream instabilities. beam-plasma systems are ubiquitous in high-energy-density environments, e.g., in laser-produced plasmas and astrophysical sources, such as in collisionless shocks of cosmic explosions - gamma-ray... | pic simulations and spectral analysis of plasma with interpenetrating beams |
earth's atmosphere, whose ionization stability plays a fundamental role for the evolution and endurance of life, is exposed to the effect of cosmic explosions producing high energy gamma-ray-bursts. being able to abruptly increase the atmospheric ionization, they might deplete stratospheric ozone on a global scale. dur... | evidence of an upper ionospheric electric field perturbation correlated with a gamma ray burst |
grbs are potential sources of uhe cosmic rays and high-energy neutrinos. recent results from icecube imply the relation between these particles is not trivial. we provide updated neutrino predictions based on realistic models. | multi-messenger light curves from gamma-ray bursts |
in this work we postulate that the process of quasi-electrostatic energy relaxation in thundercloud starts with small-scale townsend avalanches in the vicinity of colliding hydrometers and then proceeds to larger spatial scales, culminating in the formation of hot lightning seed channel. we represent the lightning init... | dynamics of ions in thunderclouds and lightning initiation |
at 00:17:12 ut, the swift burst alert telescope (bat) triggered on background noise during high background increase while entering the saa (trigger=1015615). the bat light curve shows the background increase near the saa, without any significant burst structure. the xrt began observing the field at 00:18:47.7 ut, 95.1 ... | swift trigger 1015615 is not a grb |
the fermi gamma-ray burst monitor (gbm) in orbit around the earth continues to detect gamma-ray bursts (grbs) from cosmic sources as well as terrestrial gamma-ray flashes (tgfs) and terrestrial electron beams (tebs) from the earth. an established localization code is currently utilized to determine the locations of grb... | localization of terrestrial electron beams |
in ancient greece the observations of the famous doctor hippocrates of kos had shown proved the environmental impact on human health. although the term "environment" should not only include the nature surrounding us but also space since the evolution of life depends primarily on events such supernova explosions, format... | cosmic radiation and its effects on technology and health |
we present results from the catalog of terrestrial gamma-ray flashes (tgfs) detected with the gamma-ray burst monitor (gbm) on the fermi gamma-ray space telescope. the first release, in january 2015, provided data on 2700 tgfs. updates are extending the catalog at a rate of ~800 tgfs per year. the tgf sample is reliabl... | the fermi gamma-ray burst monitor (gbm) terrestrial gamma-ray flash (tgf) catalog |
the paper considers the behavior of the upper ionosphere at heights of the f2 layer during forbush decreases in galactic cosmic rays (gcr fds) and solar cosmic ray (scr) bursts. we use the results of long-term continuous observations of cosmic rays and the ionosphere in novosibirsk for the period from 1968 to 2021. the... | topside ionosphere during solar cosmic ray bursts and forbush decreases in galactic cosmic rays |
magnetars are the most highly-magnetized neutron stars in the cosmos. giant flares from magnetars are rare, short-duration bursts of hard x-rays and soft gamma rays. in this talk, we report the discovery of gev emission from a magnetar giant flare (mgf) on april 15, 2020. the fermi large area telescope (lat) detected g... | high-energy emission from a magnetar giant flare in the sculptor galaxy |
in the early universe, most of the cold neutral gas that will later form into individual stars and galaxies is practically invisible to us. these neutral gas reservoirs can, however, be illuminated by bright cosmic lightsources such as gamma-ray bursts (grbs) and quasars. the aim of this thesis is to use these luminous... | galaxies through cosmic time illuminated by gamma-ray bursts and quasars |
the study of astronomical transients can offer the unique opportunity to obtain new insights into the nature of the transients themselves, their environments, or their lines of sight. we highlight the role in this field of uves, which first-light image was the sn 1987a ring. uves led to the discovery of ejecta-ring col... | transients science with uves |
fermi large area telescope observations towards the milky way center have revealed a spatially extended source of gamma rays in excess of the modeled astrophysical backgrounds. possible explanations for this `galactic center excess' include weakly-interacting massive particle dark matter annihilations, unresolved milll... | evidence for spatial variation in the high-energy spectrum of the galactic center excess |
jets have been observed from both neutron-star and black-hole x-ray binaries. there are many similarities between the two and a few differences. i will offer a physical explanation of the formation and destruction of jets from compact objects and i will discuss the similarities and differences in the two types. the bas... | jets in black-hole and neutron-star x-ray binaries |
using integral/spi-acs realtime data, and following [1], we have performed a search for prompt gamma-ray counterparts of hawc-190806a (gcn 25284). at the time of the event (2019-08-06 13:20:48 utc, hereafter t0), integral was operating in nominal mode. the event localization was at an angle of 33 deg with respect to th... | hawc-190806a: upper limits from integral spi-acs and ibis prompt observation |
there is tantalizing evidence that the jets launched from gamma-ray bursts (grbs) are narrower (more tightly collimated) at higher redshifts. this has important implications on both the physics of the jet launch, and also on estimates of the high redshift star formation rate from gamma-ray bursts. we present the observ... | gamma-ray burst jets: evolution over cosmic time and new predictions for the high redshift star formation rate |
the mercurian gamma-ray and neutron spectrometer (mgns) is a scientific instrument developed to study the elementary composition of the mercury's sub-surface by measurements of neutron and gamma-rays emission of the planet. mgns measures neutron fluxes in a wide energy range from thermal energy up to 10 mev and gamma-r... | spectroscopy of gamma-rays of earth, venus and mercury: mgns instrument onboard bepicolombo mission |
cold gas plays a central role in feeding and regulating star formation and growth of supermassive black holes (smbh) in galaxy nuclei. particularly powerful activity occurs when interactions of gas-rich galaxies funnel large amounts of gas and dust into nuclei of luminous and ultra luminous infrared galaxies (lirgs/uli... | feeding, feedback and the growth of galaxies - molecules as tools for probing galaxy evolution |
rs ophiuchi is the first nova to be detected in the very-high-energy range. its gamma-ray emission provides evidence of proton acceleration following the thermonuclear outburst. these observations offer new insight into the origin of cosmic rays. | gamma rays reveal proton acceleration in nova explosions |
the sagittarius b2 (sgr b2) molecular cloud complex is an x-ray reflection nebula whose nonthermal x-ray emissions have continued to decrease since 2001 as it reprocesses one or more past energetic outbursts from the supermassive black hole sagittarius a* at the galactic center. the x-ray reflection model explains the ... | new constraints on cosmic particle populations at the galactic center using x-ray observations of the molecular cloud sagittarius b2 |
in general, giant flares (gfs) produced by magnetars have a very short-hard initial spike that is followed by a weak oscillatory phase. gfs from a nearby galaxy would appear as cosmic short-hard gamma-ray bursts (grbs), such as grb 200415a. in this paper, we search for gf-originated bursts in the fermi grb category and... | magnetar giant flare origin for grb 210410a? |
the calorimetric proton detector of the gaseous detector with germanium tagging (gadget) system has been upgraded to operate as a time projection chamber (tpc) to detect low-energy, β-delayed single- and multi-particle emission of interest to astrophysics. the upgrade, known as gadget ii, uses micro pattern gaseous amp... | gadget ii tpc for decay spectroscopy studies at frib |
the swift satellite allows us to use gamma-ray bursts (grbs) to peer through the hearts of star forming galaxies through cosmic time. our open collaboration, representing most of the active european researchers in this field, builds a public legacy sample of grb x-shooter spectroscopy while swift continues to fly. to d... | the vlt/x-shooter grb afterglow legacy survey |
x-ray binary (xrb) populations in galaxies trace the demographics of close binaries, massive stars, and compact-object remnants; they provide important constraints on the accretion phase of close-binary evolution that connects to other astrophysically interesting sources (e.g., gamma-ray bursts and gravitational wave m... | x-ray binary population luminosity functions in galaxies and their dependence on star-formation history and metallicity |
there is now strong evidence that long-duration gamma-ray bursts (lgrbs) have an intrinsic preference for low-metallicity environments despite the existence of some exceptions to this trend (graham & fruchter 2013). here i will present a pair of results expanding on this work. first, a detailed effort to quantize m... | explaining the relative and absolute lgrb rate with metallically |
it has long been recognized that the most luminous sources in the universe, may be powered by gravitational energy, rotational energy and magnetic energy. we are still learning how the power is partitioned between theses various forms and how this is made manifest in the observations. in this talk, i will discuss some ... | cosmic power |
rs ophiuchi (rs oph) is a recurrent symbiotic nova. its latest outburst, on 8th of august 2021, brought to the first detection of this class of sources at very-high-energy (above 100 gev) gamma rays. we present the magic observations of rs oph during this outburst, triggered by the fermi-lat detection of high energy ga... | hadronic gamma-ray emission of nova rs oph observed by the magic telescopes |
debate regarding venus lightning has continued for four decades, sustained by seemingly contradictory searches for radio noise bursts, whistler-mode electromagnetic signatures, and optical flashes. here we report on a possible positive detection with the lac, the lightning and airglow camera, aboard the jaxa akatsuki s... | venus optical flash observed by the akatsuki lightning and airglow camera |
scalable quantum computing can become a reality with error correction, provided coherent qubits can be constructed in large arrays. the key premise is that physical errors can remain both small and sufficiently uncorrelated as devices scale, so that logical error rates can be exponentially suppressed. however, energeti... | resolving catastrophic error bursts in large arrays of superconducting qubits |
based on the results of an analysis of formosat-3/cosmic radio occultation measurements, the absorption of dm-radio waves (wavelength ~19 cm) in the lower high-latitude ionosphere of the earth was detected. the maximum absorption value is ~3 db in the range from ~60 to ~90 km and, in some cases, it reaches ~10 db at al... | gps l1 signals absorption in high-latitude lower ionosphere during severe geomagnetic storm in june 2015 |
pressure variation in lower atmosphere which take place after intensive solar proton events and forbush-decreases of galactic cosmic rays (gcrs) are analyzed for the period 1980-2006. there were plotted groups of charts (multifields) for 48 solar proton events with energies of particles ep > 90 mev and for 48 forbus... | analysis of lower atmosphere pressure field response for short-time cosmic ray variations by multifield comparison measure method |
the relativity of cosmic time is developed within the framework of cosmological relativity in five dimensions of space, time and velocity. a general linearized metric element is defined to have the form $ds^2 = (1+\phi) c^2 dt^2 - dr^2 + (1+\psi) \tau^2 dv^2$, where the coordinates are time $t$, radial distance $r=\sqr... | cosmic time transformations in cosmological relativity |
grbs are extremely energetic short cosmic transients. due to their huge energy output in a short time they can be observed at very large cosmological distances. actually, they sample the whole observable universe. as a consequence of their large distances, their observed duration, fluence and peak flux depend on the re... | redshift dependence of grbs' observed parameters |
venus has a hellish surface environment, but life may survive on the planet high in the atmosphere, within a thermal habitable zone between 62 and 48 km altitude. both ultraviolet radiation from the sun and the ionizing particle radiation of the cosmic rays are highly damaging to life, and here we study their effects o... | constraints on a potential aerial biosphere on venus: cosmic rays and solar ultraviolet radiation |
gamma-ray bursts (grbs) are flashes of high-energy radiation arising from energetic cosmic explosions. bursts of long (>2 s) duration are produced by the core-collapse of massive stars, those of short (< 2 s) duration by the merger of two neutron stars (nss). here i will present observations of the exceptionally ... | a nearby long duration gamma-ray burst from a merger of compact objects |
this article gives an overview of gamma-ray bursts (grbs) and their relation to astroparticle physics and cosmology. grbs are the most powerful explosions in the universe that occur roughly once per day and are characterized by flashes of gamma-rays typically lasting from a fraction of a second to thousands of seconds.... | gamma-ray bursts and their relation to astroparticle physics and cosmology |
we use gamma ray bursts (grbs) data from y. wang (2008) to put additional constraints on a set of cosmological dark energy models based on the holographic principle. grbs are among the most complex and energetic astrophysical events known in the universe offering us the opportunity to obtain information from the histor... | constraints on holographic cosmological models from gamma ray bursts |
we present an evolutionary model for grb afterglows that includes (1) thermal particles and (2) interaction between the shock and accelerated cosmic rays. we will comment on observational signatures of this model compared to the traditional approach. | nonlinear cosmic ray acceleration during gamma-ray burst afterglows |
phase transitions within anomalous x-ray pulsars (axps) and soft γ-ray repeaters (sgrs) can lead to mini contractions. such contractions produce pulsar gliches and shock break outs from their surface accompanied by thermal x/γ -ray emission. highly relativistic dipolar e+e− bunches launched from the pulsar polar caps e... | are fast radio bursts produced by large glitches of anomalous x-ray pulsars? |
we investigated serendipitous integral observations carried out at the time of the ligo/virgo burst candidate g275404. the satellite was pointing at ra=17:44:43 dec=-25:57:27 (in the direction of the galactic center region), close to the low-probability area of ligo localization. about 2% of the probability was contain... | ligo/virgo g275404: integral search for a prompt gamma-ray counterpart |
the spectacular outbursts of energy associated with supernovae (sne) have long motivated research into their potentially hazardous effects on earth and analogous environments. much of this research has focused primarily on the atmospheric damage associated with the unique circumstances of a gamma-ray burst, or the more... | x-ray luminous supernovae: effects on earth-like atmospheres, climate, and habitability |
this is the thirteenth edition of the series of frascati workshops on "multifrequency behaviour of high energy cosmic sources" which is undoubtedly a largely accepted biennial meeting in which an updated experimental and theoretical panorama will be depicted. this edition comes at the 35th anniversary of the first hist... | multifrequency behaviour of high energy cosmic sources - xiii |
the current data acquisition rate of astronomical transient surveys and the promise for significantly higher rates in the next decade necessitate the development of novel approaches to analyze astronomical data sets and promptly detect objects of interest. the deeper, wider, faster (dwf) program is a survey focused on ... | finding fast transient in real time using novel light curve analysis algorithm |
we present the third fermi space telescope gamma-ray burst monitor (gbm) catalog of terrestrial gamma-ray flashes (tgfs), containing almost 10 years of data. we discuss how this work builds upon the previous published and online catalogs, citing updates and improvements to the off-line search algorithms. specifically, ... | the 3rd fermi-gbm terrestrial gamma-ray flash catalog |
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