Abstract
We continue the study begun in Karasev et al. (2018) and present the results of our optical identifications of four hard X-ray sources from the INTEGRAL sky surveys. Having first improved the positions of these objects in the sky with the X-ray telescope (XRT) of the Swift observatory, we have identified their counterparts using optical and infrared sky survey data. Then, we have obtained optical spectra for the putative counterparts with the RTT-150 Russian-Turkish telescope and the AZT-33IK telescope. This has allowed the nature of the objects under study to be established. The sources IGR J11079+7106 and IGR J12171+7047 have turned out to be extragalactic in nature and be Seyfert 1 and 2 galaxies, respectively, with the second object being characterized by a large absorption column density. The source IGR J18165−3912 is most likely an intermediate polar with a very high luminosity. The fourth source, IGR J20596+4303, is a chance superposition of two objects—a Seyfert 2 galaxy and a cataclysmic variable.
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Acknowledgments
This work was supported by RSF grant no. 19-12-00396. We thank the TUBITAK National Observatory (Turkey), the Space Research Institute of the Russian Academy of Sciences, and the Kazan State University for the support in using the Russian-Turkish 1.5-m telescope (RTT-150). The results at the AZT-33IK telescope were obtained using the equipment of the Angara Center http://ckp-rf.ru/ckp/3056/ within the Basic Financing Program FNI II.16. We used the VHS data obtained with the VISTA/ESO telescope (Paranal Observatory) within Program 179.A-2010 (PI: McMahon). This publication also uses data from the WISE observatory, which is a joint project of the California University, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology financed by National Aeronautics and Space Administration.
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Russian Text © The Author(s), 2019, published in Pis’ma v Astronomicheskii Zhurnal, 2019, Vol. 45, No. 12, pp. 882–892.
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Karasev, D.I., Sazonov, S.Y., Tkachenko, A.Y. et al. Optical Identification of Four Hard X-ray Sources from the INTEGRAL Sky Surveys. Astron. Lett. 45, 836–846 (2019). https://doi.org/10.1134/S1063773719120028
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DOI: https://doi.org/10.1134/S1063773719120028