| On the Geometry of Broad-Line Regions in BL Lac Objects |
| |
| 作者姓名： | Yun Xu and Xin-Wu Cao Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai Graduate School of Chinese Academy of Sciences Beijing |
| |
| 作者单位： | Yun Xu and Xin-Wu Cao Shanghai Astronomical Observatory，Chinese Academy of Sciences，Shanghai 200030 Graduate School of Chinese Academy of Sciences，Beijing 100049 |
| |
| 基金项目： | Supported by the National Natural Science Foundation of China. |
| |
| 摘 要： | The geometry of broad-line regions (BLRs) in active galactic nuclei (AGNs) is still controversial. We use a sample of BL Lac objects, of which the black hole masses Mbh are estimated from their host galaxy absolute magnitude at R-band, MR, by using the empirical relation between MR and black hole mass Mbh. The sizes of the broad-line regions for Mgn are derived from the widths of Mgn lines and the black hole masses. Compared with the empirical relation between BLR size RBLR and MgII line luminosity LMgII, it is found the BLR sizes in the BL Lac objects derived in this paper are 2-3 orders of magnitude higher. If the BLR geometry of these sources is disklike, then the viewing angle between the axis and the line of sight is in the range of ~ 2°-15°, which is consistent with the unification scheme.
|
| 关 键 词： | 活动星系核 宽线区 黑洞 几何学 吸积盘 BLLac天体 |
On the Geometry of Broad-Line Regions in BL Lac Objects |
| |
| Yun Xu and Xin-Wu Cao Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai Graduate School of Chinese Academy of Sciences,Beijing .On the Geometry of Broad-Line Regions in BL Lac Objects[J].Chinese Journal of Astronomy and Astrophysics,2006,6(6):649-654. |
| |
| Authors: | Yun Xu Xin-Wu Cao |
| |
| Institution: | [1]Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030 [2]Graduate School of Chinese Academy of Sciences, Beijing 100049 |
| |
| Abstract: | |
| |
| Keywords: | galaxies: active-BL Lacertae objects: general-accretion accretion disks-black hole physics |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
