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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Original Russian Text © R.A. Burenin, A.V. Mescheryakov, M.G. Revnivtsev, S.Yu. Sazonov, I.F. Bikmaev, M.N. Pavlinsky, R.A. Sunyaev, 2008, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2008, Vol. 34, No. 6, pp. 403–411.
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Burenin, R.A., Mescheryakov, A.V., Revnivtsev, M.G. et al. New active galactic nuclei among the INTEGRAL and SWIFT X-ray sources. Astron. Lett. 34, 367–374 (2008). https://doi.org/10.1134/S1063773708060017
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DOI: https://doi.org/10.1134/S1063773708060017