The black hole mass–stellar velocity dispersion relation of narrow-line Seyfert 1 galaxies
- Department of Physics and Astronomy, Seoul National University, Seoul, 151-742 (Korea, Republic of)
- Department of Physics and Astronomy, University of California, Irvine, CA 92697-4575 (United States)
- Korea Astronomy and Space Science Institute, Daejeon, 305-348 (Korea, Republic of)
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{sub BH}−σ{sub ∗}) relation because of their high accretion rate and significantly low M{sub BH} . Currently, it is under discussion whether present-day NLS1s offset from the M{sub BH}−σ{sub ∗} relation. Using the directly measured stellar velocity dispersion of 93 NLS1s at z < 0.1, and M{sub BH} estimates based on the updated mass estimators, we investigate the M{sub BH}−σ{sub ∗} relation of NLS1s in comparison with broad-line AGNs. We find no strong evidence that the NLS1s deviates from the M{sub BH}−σ{sub ∗} 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 logf=0.05±0.12 (f = 1.12), for M{sub BH} estimators based on the FWHM of Hβ, by jointly fitting the M{sub BH}−σ{sub ∗} relation using quiescent galaxies and reverberation-mapped AGNs.
- OSTI ID:
- 22882672
- Journal Information:
- Astrophysical Journal, Vol. 801, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Since 2009, the country of publication for this journal is the UK.; ISSN 0004-637X
- Country of Publication:
- United Kingdom
- Language:
- English
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