期刊
ASTROPHYSICAL JOURNAL
卷 904, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/abbda1
关键词
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资金
- Academy of Finland [311438]
- NRF [2018R1A2A1A05022685]
- NCN [2018/29/B/ST9/01793]
- [AYA2012-39727-C03-01]
- [2015-71718R]
- National Research Foundation of Korea [2018R1A2A1A05022685] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The BL Lacertae object OJ 287 (z = 0.306) has unique double-peaked optical outbursts every similar to 12 yr, and it presents one of the best cases for a small-separation binary supermassive black hole (SMBH) system, with an extremely massive primary log (M-BH/M-circle dot). However, the host galaxy is unresolved or only marginally detected in all optical studies so far, indicating a large deviation from the bulge mass-SMBH mass relation. We have obtained deep, high spatial resolution i-band and K-band images of OJ 287 when the target was in a low state, which enable us to detect the host galaxy. We find the broadband photometry of the host to be consistent with an early-type galaxy with M-R = -22.5 and M-K = -25.2, placing it in the middle of the host galaxy luminosity distribution of BL Lacertae objects. The central supermassive black hole is clearly overmassive for a host galaxy of that luminosity, but not unprecedented, given some recent findings of other overmassive black holes in nearby galaxies.
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