期刊
ASTROPHYSICAL JOURNAL
卷 691, 期 2, 页码 1050-1057出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/691/2/1050
关键词
black hole physics; galaxies: nuclei; ISM: general; X-rays: general
资金
- Ministry of Education, Culture, Sports, Science, and Technology of Japan [20540269]
- Grants-in-Aid for Scientific Research [20540269] Funding Source: KAKEN
Recent numerical relativity simulations have shown that the emission of gravitational waves at the merger of two black holes gives a recoil kick to the final BH. We follow the orbits of a recoiling supermassive black hole (SMBH) in a fixed background potential of a disk galaxy including the effect of dynamical friction. If the recoil velocity of the SMBH is smaller than the escape velocity of the galaxy, the SMBH moves around in the potential along a complex trajectory before it spirals into the galactic center through dynamical friction. We consider the accretion of gas onto the SMBH from the surrounding interstellar medium and estimate the X-ray luminosity of the SMBH. We find that it can be larger than 3 x 10(39) erg s(-1) or the typical X-ray luminosity of ultra-luminous X-ray sources, when the SMBH passes the galactic disk. In particular, the luminosity could exceed similar to 10(45) erg s(-1), if the SMBH is ejected into the galactic disk. The average luminosity gradually increases as the SMBH spirals into the galactic center. We also estimate the probability of finding recoiling SMBHs with X-ray luminosities of > 3 x 10(39) erg s(-1) in a disk galaxy.
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