The size of broad-line regions of low-luminosity active galactic nuclei

Details The size of broad-line regions of low-luminosity active galactic nuclei The size of broad-line regions of low-luminosity active galactic nuclei

Jan 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007mnras.374..691z&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 374, Issue 2, pp. 691-696.

Astronomy and Astrophysics

Astronomy

6

Galaxies: Active, Galaxies: Individual: Ngc 4395, Galaxies: Nuclei

Scientific paper

We study the size of broad-line regions (BLRs) of low-luminosity active galactic nuclei (AGN), also called `dwarf AGN', defined as having LHα <= 1041ergs-1. We more than double the sample size analysed previously by Wang & Zhang. In this study we first confirm our previous result that the sizes of BLRs of low-luminosity AGN are larger than those expected from the empirical relation RBLRs-LHα valid for `normal' AGN (Seyfert 1s and quasars), except for objects with accretion rate . Secondly, we find a positive correlation between the linewidth of the narrow emission lines (as a tracer of velocity dispersion and thus bulge and black hole mass) and the size of BLRs for both normal and low-luminosity AGN. In this paper we find a non-linear dependence of the BLR sizes of low-luminosity AGN on black hole masses. We also show that the sizes of BLRs are more strongly dominated by the `specific accretion rate' , defined as , than by the masses of their central black holes. An expected result of this is that the size of the emission regions of low-ionization broad Hα of NGC 4395 should be consistent with the value from the empirical relation of RBLRs-LHα, according to the high accretion rate.

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