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Implications of Photon-Axion Oscillations on X-Ray Observations of the Coma Cluster

Pulatova, N.; Tugay, A.; Zadorozhna, L. +3 more

Axion-like particles (ALPs) emerge as predictions from various extensions of the Standard Model, standing out as plausible candidates for dark matter. Axions are thought to be produced when light passes through regions of magnetic fields. This positions astrophysical environments as prime sites for their production and subsequent detection. Howeve…

The Study of X-Ray Spectrum of Coma Galaxy Cluster

Pulatova, N.; Tugay, A.; Zadorozhna, L. +4 more

The X-ray spectrum of the Coma galaxy cluster was studied using the data from the XMM-Newton observatory. We combined 7 observations performed with the MOS camera of XMM-Newton in the 40' × 40' region centered at the Coma cluster. The analyzed observations were performed in 2000-2005 and have a total duration of 196ksec. We focus on the analysis o…

Discrete X-Ray Sources in Galaxy Clusters

Tugay, A. V.; Zadorozhna, L. V.; Shevchenko, S. Yu.

Current studies of extragalactic X-ray sources using data from orbital observatory XMM- Newton are at the front line of X-ray astronomy. Resolution capacity of the observatory instruments enable to detect separate X-ray sources in the close galaxies. In this study we used data from recently published 4XMM-DR9 catalog. This catalog contains 550124 …

X-ray Emission of ICRF Sources

Tugay, A. V.; Shevchenko, S. Yu.; Voitsekhovskiy, V. V. +1 more

Considering increasing requirements to the coordinates measurement precision by the end of XX century International Astronomical Union commenced implementation of the new astrometric system ICRF (International Celestial Reference Frame). This quasi-inertial reference frame system centered in the barycenter of the Solar System and has axes defined …

Determination of the Galaxy Cluster Orientation Using X-Ray Images by FOCAS Method

Tugay, A. V.; Shevchenko, S. Yu.

In our work we considered orientations of bright X-ray halos of the galaxy clusters (mainly Abell clusters). 78 appropriate clusters were selected using data from Xgal sample of extragalactic objects in XMM-Newton observation archive. Position angles and eccentricities of these halos were calculated applying FOCAS method. No privilegd orientations…

X-ray Emission and Orientation of Selected PF Galaxy Clusters

Tugay, A. V.; Dylda, S. S.; Panko, E. A.

X-ray counterparts for 35 galaxy clusters contained in the PF catalogue of galaxy clusters and groups were found in XMM-Newton archive. 22 ones (all from ACO catalogue) have extended elliptic X-ray haloes appropriate for determination of orientation. Position angles and eccentricities were calculated and compared with cluster orientations optical …

X-Ray Spectral Properties of the Isolated AGNs: NGC 1050, NGC 2989, ESO 317-038, ESO 438-009

Vasylenko, A. A.; Babyk, Iu. V.; Vavilova, I. B. +1 more

We have analyzed the spectral data obtained by XMM-Newton, Swift, Chandra, and INTEGRAL space observatories for several isolated AGNs from 2MIG catalogue, for which the available X-ray data were accessed. Among these objects were CGCG 179-005, NGC 6300, NGC 1050, NGC 2989, WKK 3050, ESO 438-009, and ESO 317-038. We determined corresponding spectra…

Signatures of Large-Scale Structure of Universe in X-Rays

Tugay, A. V.

A new sample of 4299 galaxies with X-ray emission was obtained in this work by cross-correlating 2XMM catalog of X-ray sources with HyperLeda database of galaxies. We analyzed distributions of optical and X-ray fluxes, redshifts and X-ray luminosities for this sample. Virgo and Coma galaxy clusters can be easily detected at redshift-space distribu…

XMM and CHANDRA High Resolution X-Ray Spectroscopy of Magnetic Cataclysmic Variables and Low Mass X-Ray Binaries

Haberl, F.; Burwitz, V.; Predehl, P. +3 more