A. E. Shtykovsky
A5055118025- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- High-pressure geophysics and materials
- Astronomical Observations and Instrumentation
- Particle Detector Development and Performance
- Calibration and Measurement Techniques
- Mechanics and Biomechanics Studies
- Advanced Semiconductor Detectors and Materials
- Advanced X-ray and CT Imaging
- Adaptive optics and wavefront sensing
- Dark Matter and Cosmic Phenomena
- Scientific Measurement and Uncertainty Evaluation
- Particle physics theoretical and experimental studies
- Galaxies: Formation, Evolution, Phenomena
- Statistical and numerical algorithms
- Advanced X-ray Imaging Techniques
- Astronomy and Astrophysical Research
Space Research Institute
2017-2024
National Research University Higher School of Economics
2023-2024
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 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 X Persei is a persistent low-luminosity X-ray pulsar of period ≈ 835 s in Be binary system. The field strength at the neutron star surface not known precisely, but indirect signs indicate magnetic above 1013 G, which makes object one most magnetized pulsars. Here we present results observations performed with Imaging Polarimetry Explorer (IXPE). polarization signal was found to be strongly dependent on spin phase pulsar. energy-averaged degree 3–8 keV band varied from several ∼20...
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...
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.
ABSTRACT We present a catalogue of point sources detected with the Mikhail Pavlinsky ART-XC telescope onboard SRG observatory during wide-field survey Galactic Bulge that was conducted as part mission’s calibration and performance verification phase in 2019. The consisted nearly 18 d consecutive scanning observations sky region |l| < 6 deg, |b| 2.5 deg median sensitivity 4 × 10−13 erg s−1 cm−2 4–12 keV energy band, which allows detection down to luminosity 3 1033 near Centre. Using...
We present an updated catalog of sources detected by the Mikhail Pavlinsky ART-XC telescope aboard Spektrum-Roentgen-Gamma (SRG) observatory during its all-sky survey. It is based on data first four and partially completed fifth scans sky (ARTSS1-5). The comprises 1545 in 4–12 keV energy band. achieved sensitivity ranges between ~4 × 10 −12 erg s −1 cm −2 near ecliptic plane ~7 −13 poles, which a ~30–50% improvement over previous version two (ARTSS12). There are ~130 objects, excluding...
We report the discovery of new long-period X-ray pulsar SRGA J204318.2+443815/SRGe J204319.0+443820 in a Be binary system. The source was found second all-sky survey by Mikhail Pavlinsky ART-XC telescope on board SRG mission. follow-up observations with XMM-Newton, NICER, and NuSTAR allowed us to discover strong coherent signal light curve period ~742 s. pulsed fraction depend an increase energy from ~20% soft X-rays >50% at high energies, as is typical for pulsars. has quite hard...
We report results of a spectral and timing analysis the X-ray pulsar XTE J1829-098 using data obtained with NuSTAR observatory during an outburst in August 2018. A strong absorption feature was detected at energy $E_{cyc}\simeq 15$ keV source spectrum. This interpreted as cyclotron resonance scattering line corresponding to magnetic field strength neutron star surface $B\simeq1.7\times10^{12}$ G. The pulse phase-resolved spectroscopy shows that is significantly all phases its other...
Context: During the ongoing all-sky survey, Mikhail Pavlinsky ART-XC telescope on board SRG observatory should discover new X-ray sources, many of which can be transient. Here we report discovery and multiwavelength follow-up a peculiar source SRGA J043520.9+552226=SRGe J043523.3+552234 - high-energy counterpart optical transient AT2019wey. Aims: Thanks to its sensitivity survey strategy, uncovers poorly studied weak populations. Using synergy with current public surveys, are aiming at...
X Persei is a persistent low-luminosity X-ray pulsar of period $\sim$835 s in Be binary system. The field strength at the neutron star surface not known precisely, but indirect signs indicate magnetic above $10^{13}$ G, which makes object one most magnetized pulsars. Here we present results observations performed with Imaging Polarimetry Explorer (IXPE). polarization signal was found to be strongly dependent on spin phase pulsar. energy-averaged degree 3-8 keV band varied from several...
Accreting X-ray pulsars (XRPs) are presumably ideal targets for polarization measurements, as their high magnetic field strength is expected to 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, EXO 2030+375, observed IXPE and contemporarily monitored Insight-HXMT SRG/ART-XC. In line obtained similar sources, analysis 2030+375 data returns low...
SXP 1323 is a peculiar high-mass X-ray binary located in the Small Magellanic Cloud, renowned for its rapid spin-up. We investigate first time broadband properties of SXP1323, as observed by Mikhail Pavlinsky ART-XC and eRosita telescopes on board SRG observatory. Using eRosita, data we produced 1-20 keV spectrum estimated pulsed fraction above 8 keV. With addition archival XMM-Newton observations traced evolution spin period over last five years found that after 2016 source switched to...
We present an updated catalog of sources detected by the Mikhail Pavlinsky ART-XC telescope aboard Spektrum-Roentgen-Gamma (SRG) observatory during its all-sky survey. It is based on data first four and partially completed fifth scans sky (ARTSS1-5). The comprises 1545 in 4-12 keV energy band. achieved sensitivity ranges between $\sim 4\times 10^{-12}$ erg s$^{-1}$ cm$^{-2}$ near ecliptic plane 7\times 10^{-13}$ poles, which a $\sim$30-50% improvement over previous version two (ARTSS12)....
ABSTRACT We report results of the spectral and timing analysis Be/X-ray pulsar SXP 4.78 using data obtained during its recent outburst with NuSTAR, Swift, Chandra, NICER observatories. Using an overall evolution system luminosity, analysis, variability power spectrum we obtain constraints on neutron star magnetic field strength. found a rapid rise outburst, absence significant changes flux decay. Several low frequency quasi-periodic oscillation features are to emerge different stages but no...
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: $\sim$680s. massive hyper-giant companion star Wray 977 supplies mass neutron via powerful stellar winds. did not detect...
The Spectrum-Roentgen-Gamma (SRG) observatory is currently conducting its 4-year all-sky X-ray survey, started on December 12, 2019. survey periodically interrupted for technological operations with the spacecraft. These time intervals are usually used by Mikhail Pavlinsky ART-XC telescope to perform calibrations. In this context, SRG carried out scanning observations of Puppis A supernova remnant (SNR) aim check imaging performance and optimize technique image reconstruction extended...