On the Black Hole - Bulge Mass Ratios in Narrow-Line Seyfert 1 Galaxies

作     者：Wei-Hao Bian and Yong-Heng Zhao1 National Astronomical Observatories, Chinese Academy of Sciences, Beijing 1000122 Department of Physics, Nanjing Normal University, Nanjing 210097 

作者机构：Department of Physics Nanjing Normal University Nanjing 210097 

出 版 物：《Chinese Journal of Astronomy and Astrophysics》 (中国天文和天体物理学报（英文版）)

年 卷 期：2003年第3卷第2期

页      面：119-124页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：Supported by the National Natural Science Foundation of China 

主　　题：galaxies: active   galaxies: nuclei   galaxies: bulges   quasars  galaxies: Seyfert 

摘      要：We present estimated ratios of the central black hole mass to the bulge mass (Mbh/Mbulge) for 15 Narrow Line Seyfert 1 galaxies (NLS1s). It is found that NLS1s apparently have lower mass ratios: the average mass ratio is about 1 × 10-4 with a spread of 2, which is one order of magnitude lower than for Broad Line AGNs and quiescent galaxies. This lower value, as compared to that established essentially for all other types of galaxies, can be accounted for by an underestimation of the black hole masses and an overestimation of the bulge masses in the NLS1s.