Evidence for a binary black hole in active nucleus of NGC 1194 galaxy?

• Published in: Kinematics and physics of celestial bodies 2015, Vol.31 (1), p.13-18
• Main Authors: Vasylenko, A. A., Fedorova, E. V., Hnatyk, B. I., Zhdanov, V. I.
• Format: Article
• Language: English
• Subjects: Accretion; Accretion disks; Astronomy; Astrophysics; Black holes; Black holes (astronomy); Extragalactic Astronomy; Inclination; Iron; Kinematics; Line of sight; Nuclei; Observations and Techniques; Physics; Physics and Astronomy; Space telescopes; Stars & galaxies; X-rays; XMM (spacecraft)
• ISSN: 0884-5913; 1934-8401
• DOI: 10.3103/S0884591315010079

Based on the data obtained with the XMM-Newton and INTEGRAL space telescopes, some properties of the X-ray emission from active nucleus of NGC 1194 galaxy are analyzed. Particular attention is paid to the X-ray energy spectrum from 6 to 7.5 keV. In this case, besides Fe K α (6.38 keV) and Fe K β (7.01 keV) fluorescent lines, an additional line with an energy of 6.51 keV was found with a rather broad profile generated in an inclined accretion disk, which is characteristic for the Fe K α relativistic line. Such a line configuration can be explained within the model of binary black hole system in the nucleus of NGC 1194 with orbital period of the order of 6 years. The energies and profiles of the iron Fe K α spectral lines correspond to the radiation of accretion disks around the Schwazschild black holes with inclination angles of 6–20 degrees between the line of sight and the normal to the disk. To make final conclusions about the line structure and the presence or absence of a binary black hole in the nucleus of NGC 1194, it is necessary to perform additional observations.