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The Discovery of a Hidden Broad Line AGN in a Bulgeless Galaxy: Keck NIR Spectroscopic Observations of SDSS J085153.64+392611.76
- Publication Year :
- 2020
- Publisher :
- arXiv, 2020.
-
Abstract
- We report the discovery of a buried, active supermassive black hole in SDSS J085153.64+392611.76, a bulgeless Seyfert 2 (Sy2) galaxy. Keck near-infrared observations reveal a hidden broad line region, allowing for the rare case where strong constraints can be placed on both the black hole mass and bulge component. Using virial mass estimators, we obtain a black hole mass of log($M_{\rm{BH}}/M_{\odot}$) = $6.78 \pm 0.50$. This is one of the only Sy2 AGN hosted in a bulgeless galaxy with a virial black hole mass estimate and could provide important constraints on the formation scenarios of the black hole seed population. The lack of a bulge component suggests that the SMBH has grown quiescently, likely caused by secular processes independent of major mergers. In the absence of a detectable bulge component, we find the $M_{\rm{BH}}$ - $M_{\rm{stellar}}$ relation to be more reliable than the $M_{\rm{BH}}$ - $M_{\rm{bulge}}$ relation. In addition, we detect extended narrow Pa$\alpha$ emission that allows us to create a rotation curve where we see counter-rotating gas within the central kiloparsec (kpc). Possible causes of this counter-rotation include a galactic bar or disruption of the inner gas by a recent fly-by of a companion galaxy. This in turn could have triggered accretion onto the central SMBH in the current AGN phase.<br />Comment: 27 pages, 9 figures. Accepted by ApJ
- Subjects :
- Physics
Supermassive black hole
Active galactic nucleus
010504 meteorology & atmospheric sciences
Astrophysics::High Energy Astrophysical Phenomena
Galactic Center
FOS: Physical sciences
Astronomy and Astrophysics
Virial mass
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics - Astrophysics of Galaxies
01 natural sciences
Galaxy
Virial theorem
Black hole
Space and Planetary Science
Bulge
Astrophysics of Galaxies (astro-ph.GA)
0103 physical sciences
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
0105 earth and related environmental sciences
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....6ed5c014729ff0f9c0b8717e73367d53
- Full Text :
- https://doi.org/10.48550/arxiv.2007.08525