NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-19 T04:36:21 PDT
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For refcode 2003PASJ...55..143B:
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Copyright by Astronomical Society of Japan. 2003PASJ...55..143B Black Hole-Bulge Relation for Narrow-Line Objects Bian, Wei-Hao; Zhao, Yong-Heng Abstract. It has been thought that narrow-line Seyfert 1 galaxies are likely to be in the early stages of the evolution of active galaxies. To test this suggestion, the ratios of the central massive black hole (MBH) mass to the bulge mass (M_bh_/M_bulge_) were estimated for 22 Narrow Line AGNs (NL AGNs). It is found that NL AGNs appear to have genuinely lower MBH/Bulge mass ratio (M_bh_/M_bulge_). The mean log (M_bh_/M_bulge_) for 22 NL AGNs is -3.9 +/- 0.07, which is an order of magnitude lower than that for Broad Line AGNs and quiescent galaxies. We suggest a nonlinear MBH/Bulge relation and find there exists a relation between the M_bh_ / M_bulge_ and the velocity dispersion, {sigma}, derived from the [O III] width. A scenario of MBH growth for NL AGNs is one of our interpretations of the nonline ar MBH/Bulge relation. The MBH growth timescales for 22 NL AGNs were calculated, with a mean value (1.29 +/- 0.24) x 10^8^ yr. Another plausible interpretation is also possible: that NL AGNs occur in low-M_bulge_ galaxies and that in such galaxies M_bh_/M_bulge_ is lower than that in galaxies with a higher M_bulge_, if we consider that NL AGNs already have their "final" M_bh_/M_bulge_. More information of the bulge in NL AGNs is needed to clarify the black hole-bulge relation. Keywords: galaxies: active, galaxies: bulges, galaxies: nuclei, galaxies: quasars, galaxies: Seyfert
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