The Black Hole Mass-Stellar Velocity Dispersion Relation of Narrow-line Seyfert 1 Galaxies
Abstract
Narrow-line Seyfert 1 galaxies (NLS1s) are arguably one of the key active galactic nucleus (AGN) subclasses in investigating the origin of the black hole mass-stellar velocity dispersion ({{M}BH}-{{σ }*}) relation because of their high accretion rate and significantly low {{M}BH} . Currently, it is under discussion whether present-day NLS1s offset from the {{M}BH}-{{σ }*} relation. Using the directly measured stellar velocity dispersion of 93 NLS1s at z < 0.1, and {{M}BH} estimates based on the updated mass estimators, we investigate the {{M}BH}-{{σ }*} relation of NLS1s in comparison with broad-line AGNs. We find no strong evidence that the NLS1s deviates from the {{M}BH}-{{σ }*} relation, which is defined by reverberation-mapped type 1 AGNs and quiescent galaxies. However, there is a clear trend of the offset with the host galaxy morphology, i.e., galaxies that are more inclined toward the LOS have higher stellar velocity dispersions, suggesting that the rotational broadening plays a role in measuring stellar velocity dispersion based on the single-aperture spectra from the Sloan Digital Sky Survey. In addition, we provide the virial factor log f=0.05+/- 0.12 (f = 1.12), for {{M}BH} estimators based on the FWHM of Hβ, by jointly fitting the {{M}BH}-{{σ }*} relation using quiescent galaxies and reverberation-mapped AGNs.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 2015
- DOI:
- 10.1088/0004-637X/801/1/38
- arXiv:
- arXiv:1412.7225
- Bibcode:
- 2015ApJ...801...38W
- Keywords:
-
- galaxies: active;
- galaxies: bulges;
- galaxies: nuclei;
- galaxies: Seyfert;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 13 pages, 9 figures, typos corrected, accepted by ApJ