A5027577812- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- High-pressure geophysics and materials
- Calibration and Measurement Techniques
- Mechanics and Biomechanics Studies
- Astrophysics and Star Formation Studies
- Particle physics theoretical and experimental studies
- Geophysics and Gravity Measurements
- Advanced Semiconductor Detectors and Materials
- Animal Disease Management and Epidemiology
- Adaptive optics and wavefront sensing
- Advanced X-ray Imaging Techniques
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Solar and Space Plasma Dynamics
- Agriculture and Biological Studies
- Vector-Borne Animal Diseases
Institute for Nuclear Research
2023-2024
Space Research Institute
2015-2024
Russian Academy of Sciences
2014-2023
University of California, Berkeley
2013-2017
University of California System
2014
Mineral Products Association
2012
Max Planck Institute for Astrophysics
2005-2012
Turku Centre for Computer Science
2012
University of Turku
2012
University of Oulu
2012
The Nuclear Spectroscopic Telescope Array (NuSTAR) mission, launched on 2012 June 13, is the first focusing high-energy X-ray telescope in orbit. NuSTAR operates band from 3 to 79 keV, extending sensitivity of far beyond ∼10 keV cutoff achieved by all previous satellites. inherently low background associated with concentrating light enables probe hard sky a more than 100-fold improvement over collimated or coded mask instruments that have operated this bandpass. Using its unprecedented...
The orbital observatory Spectrum-Roentgen-Gamma (SRG), equipped with the grazing-incidence X-ray telescopes Mikhail Pavlinsky ART-XC and eROSITA, was launched by Roscosmos to Lagrange L2 point of Sun–Earth system on July 13, 2019. launch carried out from Baikonur Cosmodrome a Proton-M rocket DM-03 upper stage. German telescope eROSITA installed SRG under an agreement between Roskosmos DLR, Aerospace Agency. In December 2019, started perform its main scientific task: scanning celestial sphere...
Astronomical Roentgen Telescope – X-ray Concentrator (ART-XC) is the hard instrument with grazing incidence imaging optics on board Spektr-Roentgen-Gamma (SRG) observatory. The SRG observatory flagship astrophysical mission of Russian Federal Space Program, which was successively launched into orbit around second Lagrangian point (L2) Earth-Sun system a Proton rocket from Baikonur cosmodrome 13 July 2019. ART-XC telescope will provide first ever true all-sky survey performed in 4–30 keV...
We present two complementary NuSTAR x-ray searches for keV-scale dark matter decaying to mono-energetic photons in the Milky Way halo. In first, we utilize known intensity pattern of unfocused stray light across detector planes -- dominant source from diffuse sources separate astrophysical emission internal instrument backgrounds using ${\sim}$7-Ms/detector deep blank-sky exposures. second, an updated parametric model full background, allowing us leverage statistical power independent...
We present results of an all-sky hard X-ray survey based on almost four years observations with the IBIS telescope onboard INTEGRAL observatory. The dead time-corrected exposure is ~33 Ms. Approximately 12% and 80% sky has been covered to limiting fluxes lower than 1 5 mCrab, respectively. Our catalog detected sources includes 403 objects, 316 which exceed a detection threshold time-averaged map sky, rest were in various subsamples exposures. Among identified sources, 219 are Galactic (90...
We use a combined 1.2 Ms of NuSTAR observations M31 to search for x-ray lines from sterile neutrino dark matter decay. For the first time in analysis, we consistently take into account signal contribution both focused and unfocused fields view. also reduce modeling systematic uncertainty by performing spectral fits each observation individually statistically combining results, instead stacking spectra. find no evidence unknown lines, thus derive limits on parameters. Our results place...
We use NuSTAR observations of the Galactic center to search for x-ray lines from radiative decay sterile neutrino dark matter. Finding no evidence unknown lines, we set limits on mass and mixing angle. In most range 10--50 keV, these are now strongest limits, at some masses improving upon previous by a factor $\ensuremath{\sim}10$. $\ensuremath{\nu}\mathrm{MSM}$ framework, where additional constraints matter production structure formation apply, allowed parameter space is reduced more than...
We analyze two dedicated NuSTAR observations with exposure ${\sim}190$ ks located ${\sim}10^\circ$ from the Galactic plane, one above and other below, to search for x-ray lines radiative decay of sterile-neutrino dark matter. These fields were chosen minimize astrophysical backgrounds while remaining near densest region matter halo. find no evidence anomalous in energy range 5--20 keV, corresponding sterile neutrino masses 10--40 keV. Interpreted context neutrinos produced via mixing, these...
Abstract The sky at MeV energies is currently poorly explored. Here we present an innovative mission concept that builds upon the heritage of past and current missions improving sensitivity and, very importantly, angular resolution. This consists in combining a Compton telescope coded-mask telescope. We delineate motivation for such define scientific goals mission. Galactic Explorer with Coded Aperture Mask Telescope (GECCO) novel next-generation covering hard X-ray soft gamma-ray energies....
We use the INTEGRAL all-sky hard X-ray survey to perform a statistical study of representative sample nearby AGN. Our entire consists 127 AGN, which 91 are confidently detected (>5 sigma) on time-averaged map obtained with IBIS/ISGRI instrument and 36 only during single observations. Among former there 66 non-blazar AGN located at |b|>5 deg, where survey's identification completeness is ~93%, we for calculating luminosity function absorption distribution. In broad agreement previous studies,...
Context. The INTEGRAL observatory operating in a hard X-ray/gamma domain has gathered large observational data set over nine years starting 2003. Most of the observing time was dedicated to Galactic source population study, making possible deepest survey X-rays ever compiled. Aims. We aim perform that can be used as basis studies, and mapping Milky Way maximum exposure available at |b|<17.5 deg. Methods. sky reconstruction algorithms especially developed for high quality imaging...
We present an analysis of a short NuSTAR observation the stellar-mass black hole and low-mass X-ray binary 4U 1630$-$472. Reflection from inner accretion disk is clearly detected for first time in this source, owing to sensitivity NuSTAR. With fits reflection spectrum, we find evidence rapidly spinning hole, $a_{*}=0.985^{+0.005}_{-0.014}$ ($1\sigma$ statistical errors). However, archival data show that source has relatively low radio luminosity. Recently claimed relationships between jet...
We present results of the study persistent high mass X-ray binaries (HMXBs) in Milky Way, obtained from deep INTEGRAL Galactic plane survey. This survey provides us a new insight into population because almost half whole sample consists sources discovered with INTEGRAL. It is demonstrated for first time that majority HMXBs have supergiant companions and their luminosity function steepens somewhere around ~2x10^{36} erg/s. show spatial density distribution correlates well star formation rate...
ABSTRACT We report on the detection of type-C quasi-periodic oscillations during initial stages outburst Swift J1727.8–1613 in 2023. Using data INTEGRAL observatory along with Mikhail PavlinskyART-XC telescope board Spektr-RG and X-ray Telescope (XRT) Neil Gehrels fast growth (QPO) frequency was traced. present a hard light curve that covers 2023 – rise plateau demonstrate QPO stable plateau. The switching from to type-B detected beginning source flaring activity. have constructed broad-band...
We present results of a study the Galactic ridge X-ray emission (GRXE) in hard X-rays performed with IBIS telescope aboard INTEGRAL. The imaging capabilities this coding aperture make it possible to account for flux from bright point sources whereas wide field view permits collect large underlying GRXE. Extensive IBIS/ISGRI detector background allowed us construct model that predicts count rate $\sim1-2$% accuracy energy band 17-60 keV. derived longitude and latitude profiles are good...
This paper is the second in a series devoted to hard X-ray (17 − 60 keV) whole sky survey performed by INTEGRAL observatory over seven years. Here we present catalog of detected sources that includes 521 objects, 449 which exceed 5σ detection threshold on time-averaged map sky, and 53 were various subsamples exposures. Among identified with known suspected nature, 262 are Galactic (101 low-mass binaries, 94 high-mass 37 cataclysmic variables, 30 other types) 221 extragalactic, including 217...
We report on the results of extensive multi-wavelength campaign from optical to GeV gamma-rays 2014 periastron passage PSR B1259-63, which is a unique high-mass gamma-ray emitting binary system with young pulsar companion. Observations demonstrate stable nature post-periastron flare and prove coincidence start rapid decay H$\alpha$ equivalent width, usually interpreted as disruption Be stellar disk. Intensive X-ray observations reveal changes in spectral behaviour happening at moment flare....
We present a first catalog of sources detected by the Mikhail Pavlinsky ART-XC telescope on board SRG observatory in 4-12 keV energy band during its ongoing all-sky survey. The comprises 867 combined map two 6-month scans sky (December 2019 - December 2020). achieved sensitivity to point varies between ~4x10^-12 erg/s/cm2 near ecliptic plane and ~8x10^-13 (4-12 keV) poles, typical localization accuracy is ~15 arcsec. Of 750 known or suspected origin catalog, 56% are extragalactic (mostly...
ABSTRACT The International Gamma-Ray Astrophysics Laboratory (INTEGRAL), launched in 2002, continues its successful work observing the sky at energies E &gt; 20 keV. legacy of mission already includes a large number discovered or previously poorly studied hard X-ray sources. growing INTEGRAL archive allows one to conduct an all-sky survey including deep extragalactic fields and deepest ever Galaxy. Taking advantage data gathered over 17 yr with IBIS coded-mask telescope INTEGRAL, we...
Dark matter sterile neutrinos radiatively decay in the Milky Way, which can be tested with searches for almost monochromatic photons x-ray cosmic spectrum. We analyse data of SRG/ART-XC telescope operated two years all-sky survey mode. With no significant hints Galactic diffuse spectrum we explore models neutrino masses 12--40 keV range and exclude corresponding regions sterile-active mixing.
This paper is the first in a series devoted to hard X-ray whole sky survey performed by INTEGRAL observatory over seven years. Here we present an improved method for image reconstruction with IBIS coded mask telescope. The main improvements are related suppression of systematic effects which strongly limit sensitivity region Galactic Plane (GP), especially crowded field Center (GC). We extended IBIS/ISGRI background model take into account Ridge Emission (GRXE). To suppress residual...
We report the results of an analysis data obtained with INTEGRAL, Swift and RXTE observatories during 2010 April September outbursts X-ray pulsar RX J0440.9+4431. The temporal spectral properties in a wide energy band (0.6-120 keV) were studied for first time. discovered ~32 keV cyclotron resonant scattering feature source spectrum, that allowed us to estimate magnetic field strength neutron star as B~3.2 x 10^12 G. was confirmed by comprehensive noise power spectrum source. Based on...