| ON THE SCATTERING ENHANCEMENT OF N v lambda 1240 EMISSION LINE OF QUASI-STELLAR OBJECTS | |
Wang, HY1,2; Wang, TG1,2; Yuan WM(袁为民)3,4 ; Wang, JX1,2; Dong, XB1,2; Zhou, HY1,2; Wang, HY (reprint author), Univ Sci & Technol China, Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China.
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| 发表期刊 | ASTROPHYSICAL JOURNAL
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| 2010-02-10 | |
| 卷号 | 710期号:1页码:78-90 |
| DOI | 10.1088/0004-637X/710/1/78 |
| 产权排序 | 第3完成单位 |
| 收录类别 | SCI |
| 关键词 | Quasars: Absorption Lines Quasars: Emission Lines Radiative Transfer Scattering |
| 摘要 | The N v emission line of active galactic nuclei shows peculiar behavior in the line-continuum correlation, which may be indicative of an extra line component in addition to that from the normal broad emission line region. In this paper, we investigate possible contribution to the N v emission via resonant scattering of both continuum and Ly alpha in a broad absorption line (BAL) outflow by performing the Sobolev Monte Carlo simulations. The contribution is dependent on the covering factor, optical depth, and velocity profile of the outflow, as well as the equivalent width (EW) of Lya. Adopting model parameters constrained by observations, we find that the measured N v EW in the spectra of non-BAL quasi-stellar objects (QSOs) could have been enhanced by a factor of 1.82-2.73 on average, while there is only moderate absorption of Lya along the BAL outflow direction. Our model can produce a relatively narrow scattering line profile. About 80% of the total scattered flux falls within the central +/- 4500 km s(-1). We find that the resonant scattering can produce a prominent polarized emission line around N v. Both the broad excess emission and the unusually large polarized flux observed around N v in BAL QSOs are considered as strong evidence for the scattering enhancement. Future spectropolarimetric observations and spectroscopic monitoring of luminous QSOs may offer crucial tests for this interpretation, and provide useful information on the physical and geometrical properties of QSO outflows. We argue that the scattering offers a promising and robust process for producing the peculiar behavior of N v emission compared to the other processes proposed previously. |
| 项目资助者 | NSFC [10533050, 10703006, 10973013] |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 0004-637X |
| URL | 查看原文 |
| WOS记录号 | WOS:000273850800008 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | BROAD-ABSORPTION-LINE ; ACTIVE GALACTIC NUCLEI ; DIGITAL SKY SURVEY ; DISK WINDS ; COVERING FACTOR ; X-RAY ; ULTRAVIOLET OBSERVATIONS ; ELEMENTAL ABUNDANCES ; INTRINSIC FRACTION ; IONIZING CONTINUUM |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/4998 |
| 专题 | 高能天体物理研究组 中国科学院天体结构与演化重点实验室 |
| 通讯作者 | Wang, HY (reprint author), Univ Sci & Technol China, Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China. |
| 作者单位 | 1.Key Laboratory for Research in Galaxies and Cosmology, University of Science and Technology of China, Chinese Academy of Sciences, Hefei, Anhui 230026, China 2.Center for Astrophysics, University of Science and Technology of China, Hefei, Anhui 230026, China 3.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan 650011, China 4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China |
| 推荐引用方式 GB/T 7714 | Wang, HY,Wang, TG,Yuan WM,et al. ON THE SCATTERING ENHANCEMENT OF N v lambda 1240 EMISSION LINE OF QUASI-STELLAR OBJECTS[J]. ASTROPHYSICAL JOURNAL,2010,710(1):78-90. |
| APA | Wang, HY.,Wang, TG.,Yuan WM.,Wang, JX.,Dong, XB.,...&Wang, HY .(2010).ON THE SCATTERING ENHANCEMENT OF N v lambda 1240 EMISSION LINE OF QUASI-STELLAR OBJECTS.ASTROPHYSICAL JOURNAL,710(1),78-90. |
| MLA | Wang, HY,et al."ON THE SCATTERING ENHANCEMENT OF N v lambda 1240 EMISSION LINE OF QUASI-STELLAR OBJECTS".ASTROPHYSICAL JOURNAL 710.1(2010):78-90. |
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