| Inclination of Broad Line Region in Narrow Line and Broad Line Seyfert 1 Galaxies |
| |
| 作者姓名： | Tian-Zhi Zhang and Xue-Bing Wu |
| |
| 作者单位： | Tian-Zhi Zhang and Xue-Bing WuDepartment of Astronomy，School of Physics，Peking University，Beijing 100871 |
| |
| 基金项目： | This work is partially supported by the NSFC (No. 10173001) and by the Scientific Foundation for Returned Overseas Chinese Scholars, Ministry of Education, China. |
| |
| 摘 要： | The sizes of the Broad Line Region (BLR) of some Seyfert 1 galax-ies and nearby quasars can be determined by the reverberation mapping method.Combining with the observed FWHM of Hβ emission line and assuming that themotion of BLR clouds is virialized, the black hole masses of these objects have beenestimated. However, this method strongly depends on the poorly-understood geom-etry and inclination of the BLR. On the other hand, a tight correlation between theblack hole mass and the bulge velocity dispersion was recently found for both activeand nearby inactive galaxies. This may provide another method, independent of theBLR geometry, for estimating the black hole mass. Using this method for estimatingthe black hole mass and combining with the measured BLR size and FWHM of Hβemission line, we derived the BLR inclination angles for 20 Seyfert I galaxies underthe assumption that the BLR is disk-like. The derived inclination angles agree wellwith those derived previously by fitting the UV continuum and Hβ emission lineprofiles. Adopting a relation between the FWHMs of OⅢ]λ5007 forbidden line andthe stellar velocity dispersion, we also estimated the BLR inclinations for 50 nar-row line Seyfert 1 galaxies (NLSls). We found that the inclinations of broad LineSeyfert 1 galaxies (BLS1s) are systematically greater than those of NLS1s, whichseldom exceed 30. This may be an important factor that leads to the differencesbetween NLS1s and BLS1s if the BLR of NLS1s is really disk-like.
|
Inclination of Broad Line Region in Narrow Line and Broad Line Seyfert 1 Galaxies |
| |
| Tian-Zhi Zhang and Xue-Bing Wu.Inclination of Broad Line Region in Narrow Line and Broad Line Seyfert 1 Galaxies[J].Chinese Journal of Astronomy and Astrophysics,2002,2(6). |
| |
| Authors: | Tian-Zhi Zhang Xue-Bing Wu |
| |
| Institution: | Department of Astronomy, School of Physics, Peking University, Beijing 100871 Department of Astronomy, School of Physics, Peking University, Beijing 100871 |
| |
| Abstract: | The sizes of the Broad Line Region (BLR) of some Seyfert 1 galax-ies and nearby quasars can be determined by the reverberation mapping method.Combining with the observed FWHM of Hβ emission line and assuming that themotion of BLR clouds is virialized, the black hole masses of these objects have beenestimated. However, this method strongly depends on the poorly-understood geom-etry and inclination of the BLR. On the other hand, a tight correlation between theblack hole mass and the bulge velocity dispersion was recently found for both activeand nearby inactive galaxies. This may provide another method, independent of theBLR geometry, for estimating the black hole mass. Using this method for estimatingthe black hole mass and combining with the measured BLR size and FWHM of Hβemission line, we derived the BLR inclination angles for 20 Seyfert I galaxies underthe assumption that the BLR is disk-like. The derived inclination angles agree wellwith those derived previously by fitting the UV continuum and Hβ emission lineprofiles. Adopting a relation between the FWHMs of OⅢ]λ5007 forbidden line andthe stellar velocity dispersion, we also estimated the BLR inclinations for 50 nar-row line Seyfert 1 galaxies (NLSls). We found that the inclinations of broad LineSeyfert 1 galaxies (BLS1s) are systematically greater than those of NLS1s, whichseldom exceed 30. This may be an important factor that leads to the differencesbetween NLS1s and BLS1s if the BLR of NLS1s is really disk-like. |
| |
| Keywords: | galaxies: active- galaxies: nuclei- galaxies: Seyfert |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
