New active galactic nuclei among the INTEGRAL and SWIFT X-ray sources |
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| Authors: | R A Burenin A V Mescheryakov M G Revnivtsev S Yu Sazonov I F Bikmaev M N Pavlinsky R A Sunyaev |
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| Institution: | (1) Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, Moscow, 117997, Russia;(2) Max-Planck-Institut für Astrophysik, Garching, Germany;(3) Kazan State University, Kremlevskaya ul. 18, Kazan, 420008, Russia;(4) Academy of Sciences of Tatarstan, Kazan, 420111, Russia |
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| Abstract: | We present the results of our optical identifications of a set of X-ray sources from the INTEGRAL and SWIFT all-sky surveys. The optical data have been obtained with the 1.5-m Russian-Turkish Telescope (RTT-150). Nine X-ray sources have been identified with active galactic nuclei (AGNs). Two of them are located in the nearby spiral galaxies MCG-01-05-047 and NGC 973 seen almost edge-on. One source, IGR J16562-3301, is probably a BL Lac object (blazar). The remaining AGNs are observed as the starlike nuclei of spiral galaxies whose spectra exhibit broad emission lines. The relation between the hard X-ray (17–60 keV) luminosity and the O III] 5007 line luminosity, log L x/L O III] ≈ 2.1, holds good for most of the AGNs detected in hard X rays. However, the luminosities of some AGNs deviate from this relation. The fraction of such objects can reach ～20%. In particular, the O III] line flux is lower for two nearby edge-on spiral galaxies. This can be explained by the effect of absorption in the galactic disks. |
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| Keywords: | X-ray sources gamma-ray sources active galactic nuclei optical observations |
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