| Broad-line Balmer decrements in blue active galactic nuclei | |
Dong, XB1,2; Wang, TG1,2; Wang JG(王建国)3,4 ; Yuan WM(袁为民)3; Zhou, HY1,2,5; Dai, HF1,2; Zhang, K1,2; Dong, XB (reprint author), Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Anhui, Peoples R China.
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| 发表期刊 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 2008-01-11 | |
| 卷号 | 383期号:2页码:581-592 |
| DOI | 10.1111/j.1365-2966.2007.12560.x |
| 产权排序 | 第3完成单位 |
| 收录类别 | SCI |
| 关键词 | Quasars : Emission Lines Quasars : General |
| 摘要 | We have investigated the broad-line Balmer decrements (H alpha/H beta) for a large, homogeneous sample of Seyfert 1 galaxies and quasi-stellar objects (QSOs) using spectroscopic data obtained in the Sloan Digital Sky Survey. The sample, drawn from the Fourth Data Release, comprises 446 low-redshift (z less than or similar to 0.35) active galactic nuclei (AGN) that have blue optical continua as indicated by the spectral slopes in order to minimize the effect of dust extinction. We find that (i) the distribution of the intrinsic broad-line H alpha/H beta ratio can be well described by log-Gaussian, with a peak at H alpha/H beta = 3.06 and a standard deviation of about 0.03 dex only; (ii) the Balmer decrement does not correlate with AGN properties such as luminosity, accretion rate and continuum slope, etc.; (iii) on average, the Balmer decrements are found to be only slightly larger in radio-loud sources (3.37) and sources having double-peaked emission-line profiles (3.27) compared to the rest of the sample. We therefore suggest that the broad-line H alpha/H beta ratio can be used as a good indicator for dust extinction in the AGN broad-line region; this is especially true for radio-quiet AGN with regular emission-line profiles, which constitute the vast majority of the AGN population. |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 0035-8711 |
| URL | 查看原文 |
| WOS记录号 | WOS:000252122000015 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | DIGITAL SKY SURVEY ; PEAKED EMISSION-LINES ; BRIGHT QUASAR SURVEY ; EARLY DATA RELEASE ; BLACK-HOLE MASSES ; SEYFERT-1 GALAXIES ; RADIO-LOUD ; H-ALPHA ; ULTRAVIOLET CONTINUUM ; INFRARED-EMISSION |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/4965 |
| 专题 | 高能天体物理研究组 |
| 通讯作者 | Dong, XB (reprint author), Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Anhui, Peoples R China. |
| 作者单位 | 1.Centre for Astrophysics, University of Science and Technology of China, Hefei, Anhui, 230026, China 2.Joint Institute of Galaxies and Cosmology, Shanghai Observatory and University of Science and Technology China 3.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming, Yunnan 650011, China 4.Department of Physics, Yunnan University, 650031, Kunming, China 5.Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, 85748 Garching, Germany |
| 推荐引用方式 GB/T 7714 | Dong, XB,Wang, TG,Wang JG,et al. Broad-line Balmer decrements in blue active galactic nuclei[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2008,383(2):581-592. |
| APA | Dong, XB.,Wang, TG.,Wang JG.,Yuan WM.,Zhou, HY.,...&Dong, XB .(2008).Broad-line Balmer decrements in blue active galactic nuclei.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,383(2),581-592. |
| MLA | Dong, XB,et al."Broad-line Balmer decrements in blue active galactic nuclei".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 383.2(2008):581-592. |
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