| On the Black Hole - Bulge Mass Ratios in Narrow-Line Seyfert 1 Galaxies |
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| 作者姓名： | Wei-Hao Bian and Yong-Heng Zhao
National Astronomical Observatories Chinese Academy of Sciences Beijing |
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| 作者单位： | Wei-Hao Bian and Yong-Heng Zhao
1 National Astronomical Observatories，Chinese Academy of Sciences，Beijing 100012
2 Department of Physics，Nanjing Normal University，Nanjing 210097 |
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| 基金项目： | Supported by the National Natural Science Foundation of China. |
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| 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.
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| 关 键 词： | 赛佛特星系 黑洞 MBH 膨胀物质比值 类星体 活动星系 |
On the Black Hole - Bulge Mass Ratios in Narrow-Line Seyfert 1 Galaxies |
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| Wei-Hao Bian and Yong-Heng Zhao
National Astronomical Observatories,Chinese Academy of Sciences,Beijing
.On the Black Hole - Bulge Mass Ratios in Narrow-Line Seyfert 1 Galaxies[J].Chinese Journal of Astronomy and Astrophysics,2003,3(2):119-124. |
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| Authors: | Wei-Hao Bian Yong-Heng Zhao |
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| Abstract: | We present estimated ratios of the central black hole mass to the bulgemass (Mbh/Mbulge) for 15 Narrow Line Seyfert 1 galaxies (NLS1s). It is found thatNLS1s apparently have lower mass ratios: the average mass ratio is about 1 × 10-4with a spread of 2, which is one order of magnitude lower than for Broad Line AGNsand quiescent galaxies. This lower value, as compared to that established essentiallyfor all other types of galaxies, can be accounted for by an underestimation of theblack hole masses and an overestimation of the bulge masses in the NLS1s. |
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| Keywords: | galaxies: active - galaxies: nuclei - galaxies: bulges - quasars -galaxies: Seyfert |
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