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Optical identification of the hard X-ray source IGR J18257-0707 |
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| Authors: | R. A. Burenin I. F. Bikmaev M. G. evnivtsev J. A. Tomsick S. Yu. Sazonov M. N. Pavlinsky R. A. Sunyaev |
| Affiliation: | (1) Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, Moscow, 117997, Russia;(2) Kazan State University, Kremlevskaya ul. 18, Kazan, 420008, Russia;(3) Academy of Sciences of Tatarstan, Kazan, Tatarstan, Russia;(4) Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, Postfach 1317, D-85741 Garching, Germany;(5) Space Sciences Laboratory, University of California, Berkeley, California, USA |
| Abstract: | We present the results of our optical identification of the hard X-ray source IGR J18257-0707 through its spectrophotometric observations with the optical RTT-150 telescope. The accurate position of the X-ray source determined using Chandra observations has allowed this source to be confidently associatedwith a faint optical object (m R ≈ 20.4) whose optical spectrumexhibits a broad H α emission line at redshift z = 0.037. Thus, the source IGR J18257-0707 is a type-1 Seyfert galaxy at redshift z = 0.037. |
| Keywords: | X-ray sources gamma-ray sources active galactic nuclei optical observations |
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