Journal of Physical Studies 25(4), Article 4901 [15 pages] (2021)
DOI: https://doi.org/10.30970/jps.25.4901

X-RAY SPECTRAL FEATURES AND CLASSIFICATION OF SELECTED QSOs

L. V. Zadorozhna1 , A. V. Tugay1 , O. I. Maluy1, N. G. Pulatova2 

1Taras Shevchenko National University of Kyiv, Physical faculty,
2, Glushkov Ave., Kyiv, UA–03680, Ukraine,
2Main Astronomical Observatory of the National Academy of Sciences of Ukraine,
27, Akademika Zabolotnoho St., Kyiv, UA–03143, Ukraine,
e-mails: zadorozhna_lida@ukr.net, tugay.anatoliy@gmail.com, albufeira.astronomy@gmail.com, nadya@mao.kiev.ua

Received 06 June 2021; in final form 23 August 2021; accepted 05 October 2021; published online 08 December 2021

We present the results of a systematic analysis of the XMM-Newton spectra of nearby optically bright QSOs. The objects have been selected from X-ray Galaxy Catalog Xgal20. It is a catalog of 1172 manually identified and classified galaxies, obtained as a cross-correlation between the 4XMM-DR9 catalog and the Hyper-Linked Extragalactic Databases and Archives (HyperLeda) with an X-ray flux greater than $F \geq 10^{-13} \mbox{erg}/(\mbox{cm}^2·\mbox{s})$.

The goal of this work is to characterize the X-ray spectral properties of selected QSOs in the 0.1 - 10 keV energy band. The majority of the sources (6 out of 11) are classified as radio-quiet QSOs. We studied optical spectra, hardness ratios and performed X-ray spectral fits for the 10 brighter sources. In most cases, the power law model with absorption is good enough to simulate observed continua. However, the details of the spectrum in some sources significantly complicate the model for fitting. The majority of sources have steep spectra $Γ > 2.1$. Extremely steep photon index ($\sim 2.4 - 2.5$) in our sample occurs for three radio-loud type I quasars. We detected Fe K$α$ line for two radio-loud type II quasars. We find no strong evidence for spectral hardening above 2 keV either for quasars, of type I, or for the obscured type II. For each quasar its type was established both based on the features and details of observed X-ray spectrum and previous data.

Key words: active galactic nuclei, quasars, X-ray galaxies, XMM-Newton.

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