A5030235027- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- High-pressure geophysics and materials
- Astronomy and Astrophysical Research
- Particle Detector Development and Performance
- Mechanics and Biomechanics Studies
- Calibration and Measurement Techniques
- Geophysics and Gravity Measurements
- Galaxies: Formation, Evolution, Phenomena
- Advanced Semiconductor Detectors and Materials
- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Advanced X-ray Imaging Techniques
- Radio Astronomy Observations and Technology
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Cold Atom Physics and Bose-Einstein Condensates
- Dark Matter and Cosmic Phenomena
Space Research Institute
2015-2024
Moscow Institute of Physics and Technology
2021
Russian Academy of Sciences
2004-2013
Astronomical Institute of the Slovak Academy of Sciences
2009
Université de Toulouse
2009
Université Toulouse III - Paul Sabatier
2009
Centre National de la Recherche Scientifique
2009
Centre National d'Études Spatiales
2008
Max Planck Institute for Astrophysics
2005-2007
Max Planck Society
2005
We report on INTEGRAL observations of the soft $\gamma$-ray repeater SGR 1935+2154 performed between 2020 April 28 and May 3. Several short bursts with fluence $\sim10^{-7}-10^{-6}$ erg cm$^{-2}$ were detected by IBIS instrument in 20-200 keV range. The burst hardest spectrum, discovered localized real time Burst Alert System, was spatially temporally coincident a very bright radio CHIME STARE2 telescopes at 400-800 MHz 1.4 GHz, respectively. Its lightcurve shows three narrow peaks separated...
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...
A black hole x-ray binary (XRB) system forms when gas is stripped from a normal star and accretes onto hole, which heats the sufficiently to emit x-rays. We report polarimetric observation of XRB Cygnus X-1 using Imaging Polarimetry Explorer. The electric field position angle aligns with outflowing jet, indicating that jet launched inner emitting region. polarization degree (4.01+-0.20)% at 2 8 kiloelectronvolts, implying accretion disk viewed closer edge-on than orbit. observations reveal...
Abstract We report on Konus-WIND (KW) and Mikhail Pavlinsky Astronomical Roentgen Telescope – X-ray Concentrator (ART-XC) observations analysis of a nearby GRB 221009A, the brightest γ -ray burst (GRB) detected by KW for >28 yr observations. The prompt, pulsed phase emission lasts ∼600 s is followed steady power-law decay lasting more than 25 ks. From ART-XC light curves spectral data, we derive time-averaged peak energy E p ≈ 2.6 MeV, at 3.0 total 20 keV–10 MeV fluence ≈0.22 erg cm −2 ,...
Aims. We study the spectrum of cosmic X-ray background (CXB) in energy range ~5-100 keV.
Using Fourier frequency resolved X-ray spectroscopy we study short term spectral variability in luminous LMXBs. With RXTE/PCA observations of 4U1608–52 and GX 340+0 on the horizontal/normal branch color-intensity diagram show that aperiodic quasiperiodic ~second–millisecond time scales is caused primarily by variations luminosity boundary layer. The emission accretion disk less variable these its power density spectrum follows law, contributing to observed flux variation at low frequencies...
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...
Since its launch INTEGRAL has devoted a significant fraction of observing time to the Galactic plane region. We present results observations inner spiral arms Galaxy (Norma, Scutum and Sagittarius) with attention high mass X-ray binaries. The increased sensitivity survey possibility detect absorbed sources significantly enlarged our sample HMXBs in comparison previous studies. For some we for first quality broadband (1–100 keV) energy spectra. confirm pulsations flux IGR J16358-4726,...
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...
How black holes consume and eject matter has been the subject of intense studies for more than 60 years. The luminosity these systems are often compared to Eddington limit, border at which spherical accretion is inhibited by radiation pressure photons it produces. discovery ultraluminous X-ray sources (ULXs) showed that can proceed even when apparent exceeds limit (Kaaret et al. 2017). High might be produced beaming incident a thick collimated outflow or truly super-Eddington flow. However,...
We report on Imaging X-ray polarimetry explorer (IXPE) observations of the Be-transient pulsar LS V +44 17/RX J0440.9+4431 made at two luminosity levels during giant outburst in January–February 2023. Considering observed spectral variability and changes pulse profiles, source was likely caught supercritical subcritical states with significantly different emission-region geometry, associated presence accretion columns hot spots, respectively. focus here pulse-phase-resolved polarimetric...
Accreting X-ray pulsars (XRPs) are presumed to be ideal targets for polarization measurements, as their high magnetic field strength is expected polarize the emission up a degree of ∼80%. However, such expectations being challenged by recent observations XRPs with Imaging Polarimeter Explorer (IXPE). Here, we report on results yet another XRP, namely, EXO 2030+375, observed IXPE and contemporarily monitored Insight-HXMT SRG/ART-XC. In line obtained similar sources, an analysis 2030+375 data...
The phase- and energy-resolved polarization measurements of accreting X-ray pulsars (XRPs) allow us to test different theoretical models their emission, they also provide an avenue determine the emission region geometry. We present results observations XRP GX 301−2 performed with Imaging Polarimetry Explorer (IXPE). A persistent XRP, has one longest spin periods known: ∼680 s. massive hyper-giant companion star Wray 977 supplies mass neutron via powerful stellar winds. did not detect...
Results of simultaneous INTEGRAL and optical observations the galactic microquasar SS433 in May 2003 /RXTE March 2004 are presented. Persistent precessional variability with a maximum to minimum uneclipsed hard X-ray flux ratio ∼4 is discovered. The 18–60 keV eclipse found be phase near infrared eclipses. orbital observed by at least two times deeper apparently wider than soft band. broadband 2–100 spectrum simultaneously detected RXTE/INTEGRAL can explained bremsstrahlung emission from...
ABSTRACT We report the results of monitoring campaign transient X-ray pulsar SMC X-2 performed with Swift /XRT telescope over period 2015 September–2016 January during Type II outburst. During this event, bolometric luminosity source ranged from ≃10 39 down to several ×10 34 erg s −1 . Moreover, we discovered its dramatic drop by a factor more than 100 below limiting value <?CDATA ${L}_{\mathrm{lim}}\simeq 4\times {10}^{36}$?> , which can be interpreted as transition propeller regime. These...
We discuss the physics case for and concept of a medium-scale axion helioscope with sensitivities in axion-photon coupling few times better than CERN Axion Solar Telescope (CAST). Search an axion-like particle these couplings is motivated by several persistent astrophysical anomalies. present early conceptual design, existing infrastructure, projected sensitivity timeline such (Troitsk Experiment, TASTE) to be constructed Institute Nuclear Research, Troitsk, Russia. The proposed instrument...
We report the discovery of absorption features in X-ray spectrum transient pulsar GROJ2058+42. The are detected around $\sim10$, $\sim20$ and $\sim30$ keV both NuSTAR observations carried out during source type II outburst spring 2019. most intriguing property is that deficit photons these energies registered only narrow phase interval covering 10% spin period. interpret lines as a cyclotron resonant scattering line (fundamental) two higher harmonics. measured energy allow us to estimate...
Abstract We report results of the first broadband observation transient X-ray pulsar GRO J1008−57 performed in quiescent state. Observations were conducted quasi-simultaneously with NuSTAR and Mikhail Pavlinsky ART-XC telescope on board SRG right before beginning a Type I outburst. was detected state lowest observed luminosity around several ×10 34 erg s −1 consequently accreting from cold disk. Timing analysis allowed us to detect pulsations during this for time. The pulsed fraction about...
We present the results of an analysis quiescent X-ray emission from Soft Gamma-Ray Repeater SGR 1806-20, taken during INTEGRAL ultra-deep survey Galactic center region in Aug.-Sep. 2003. The total effective exposure time spent on source by IBIS telescope these observations was 1.6 million seconds. Combining with XMM-Newton observatory, we broad band (1-200 keV) spectrum this source. This is first persistent energy range up to 200 keV. very hard and has a power law shape () without any trace...
We report the results of a spectral and timing analysis poorly studied transient X-ray pulsar 2S 1553−542 using data collected with NuSTAR Chandra observatories Fermi/GBM instrument during an outburst in 2015. The properties source at high energies (>30 keV) are for first time sky position has been essentially improved. broad-band spectrum quite complicated shape can be reasonably described by composite model two continuum components – blackbody emission temperature about 1 keV low power law...
In the beginning of 2023 Be transient X-ray pulsar RX J0440.9+4431 underwent a fist-ever giant outburst observed from source peaking in February and reaching peak luminosity $\sim 4.3\times10^{37}$ erg s$^{-1}$. Here we present results detailed spectral temporal study based on NuSTAR, INTEGRAL, Swift, NICER observations performed during this period covering wide range energies luminosities. We find that both pulse profile shape hardness change abruptly around $\sim2.8\times10^{37}$ s$^{-1}$,...