X-ray galaxy catalog Xgal
Heading:
| Zadorozhna, LV, Tugay, AV, Shevchenko, SY, Pulatova, NG |
| Kinemat. fiz. nebesnyh tel (Online) 2021, 37(3):68-83 |
| https://doi.org/10.15407/kfnt2021.03.068 |
| Start Page: Extragalactic Astronomy |
| Language: Ukrainian |
Abstract: The study of extragalactic X-ray sources using the data from the XMM-Newton space observatory is one of the main directions of modern X-ray astronomy. The observations have shown that X-rays from galaxies are mainly the radiations of the central region — the active galactic nucleus and the set of X-ray sources in the galaxy’s disk. In our work, a cross-correlation was made between the 4XMM-DR9 catalog and the HyperLeda galaxy database. The 4XMM-DR9 catalog is modern, large catalog of observations containing 550124 unique sources covering 2.85% of the sky, and HyperLeda contains about 1.5 million galaxies. As a result, we obtained a sample of more than 5000 X-ray galaxies, most of which are low-luminoslty active galactic nuclei. Based on this sample, galaxies with an X-ray flux greater than F = 10-20 J×cm-2s-1 were selected. Because it is easier to construct an informative spectrum for such sources, they are of particular interest. An identified and classified catalog of 1172 manually verified galaxies, the X-ray Galaxy Catalog Xgal, was created. Most galaxies in Xgal have an active X-ray nucleus, Seyfert galaxies predominate at short distances and quasars predomtnate at large distances. 169 galaxtes have an extended nucleus with a visible surface brightness distribution, 173 galaxies have been detected with more than one X-ray source. Based on Xgal, it was created a catalog of elongated X-ray galaxies (which optical angular sizes are in the range exceed a > 60”) having X-ray sources outside the nucleus. Both catalogs are freely available. In the future, it is possible to use the Xgal catalog to construct the spectra of a certain class of objects in different ranges and to develop or improve the theory of their radiation, survey bright and extended quasars, and use the entire cross-sample to study low-luminostty active gatactic nuclei, large-scale structure of the universe in the X-ray range. |
| Keywords: 4XMM-DR9, active galactic nuclei, extragalactic discrete X-ray sources, HyperLeda, quasars, X-rays from galaxies, «XMM-Newton» |
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