Search Publications
Identification of the ~3.55 keV emission line candidate objects across the sky
Savchenko, D. O.; Iakubovskyi, D. A.
An emission line at the energy ~3.55 keV detected in different galaxies and galaxy clusters has caused numerous discussions in high-energy astrophysics and particle physics communities. To reveal the origin of the line, we analyzed publicly-available observations of MOS cameras from XMM-Newton cosmic observatory - the instrument with the largest s…
The luminosity - spectral index dependence of the X-ray bright Seyfert galaxies
Tugay, A. V.; Sadova, V. A.
X-ray luminosities and spectral indices of 97 bright Seyfert 1 (Sy1) galaxies from the XMM-Newton archive are analysed in this article. Distribution of these values is random, so we conclude that the model of emission should be at least two-parametric. Within the framework of the merging model of active galactic nuclei (AGN), the relation between …
Creation of 2-5 keV and 5-10 keV sky maps using XMM-Newton data
Savchenko, D. O.; Iakubovskyi, D. A.
Sky maps are powerful visualisation tools for quicklook analysis of extended sources. The latest sky map in soft X-rays (0.1-2.4 keV) has been created in the 1990's using ROSAT data. By analysing publically available data from XMM-Newton X-ray mission we constructed new sky maps in two energy bands - 2-5 keV and 5-10 keV, complementary to ROSAT da…
Observations of Sy2 galaxy NGC 3281 by XMM-Newton and INTEGRAL satellites
Vasylenko, A. A.; Fedorova, E.; Zhdanov, V. I.
We present the results of the analysis of X-ray properties of the Seyfert 2 galaxy NGC 3281, based on the observational data obtained by XMM-Newton and INTEGRAL within the energy ranges 0.2-12 keV and 20-150 keV, respectively. The XMM-Newton spectrum of this object is presented for the first time. We show that fitting the X-ray spectrum of this ga…
Bright X-ray galaxies in SDSS filaments
Tugay, A. V.
Eighteen bright X-ray emitting galaxies were found in nearby filaments within the SDSS region. Basic X-ray spectral parameters were estimated for these galaxies using a power law model with photoelectric absorption. A close pair of X-ray galaxies was found.
Nonthermal emission model of isolated X-ray pulsar RX J0420.0-5022
Chkheidze, N.; Babyk, Iu.
In this paper, an alternative theoretical interpretation to the generally assumed thermal emission models of the observed X-ray spectrum of isolated pulsar RX J0420.0-5022 is presented. It is well-known that at a pulsar surface, the distribution function of relativistic particles is one-dimensional. However, cyclotron instability causes an appeara…