A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
The Host Galaxy of OJ 287 Revealed by Optical and Near-infrared Imaging
Tekijät: Nilsson K, Kotilainen J, Valtonen M, Gomez JL, Castro-Tirado AJ, Drozdz M, Gopakumar A, Jeong S, Kidger M, Komossa S, Mathur S, Park IH, Reichart DE, Zola S
Kustantaja: IOP PUBLISHING LTD
Julkaisuvuosi: 2020
Journal: Astrophysical Journal
Tietokannassa oleva lehden nimi: ASTROPHYSICAL JOURNAL
Lehden akronyymi: ASTROPHYS J
Artikkelin numero: ARTN 102
Vuosikerta: 904
Numero: 2
Sivujen määrä: 6
ISSN: 0004-637X
DOI: https://doi.org/10.3847/1538-4357/abbda1
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/50481983
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.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
