NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-18 T01:48:03 PDT
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For refcode 2007MNRAS.374..691Z:
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Copyright by Royal Astronomical Society. 2007MNRAS.374..691Z The size of broad-line regions of low-luminosity active galactic nuclei Xue-Guang Zhang, Deborah Dultzin-Hacyan and Ting-Gui Wang Abstract. We study the size of broad-line regions (BLRs) of low-luminosity active galactic nuclei (AGN), also called 'dwarf AGN', defined as having L_H{alpha}_ <= 10^41^ erg s^-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 R_BLRs_-L_H{alpha}_ 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 H{alpha} of NGC 4395 should be consistent with the value from the empirical relation of R_BLRs_-L_H{alpha}_, according to the high accretion rate. Key words:
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