| THE STRUCTURE AND SPECTRAL FEATURES OF A THIN DISK AND EVAPORATION-FED CORONA IN HIGH-LUMINOSITY ACTIVE GALACTIC NUCLEI | |
Liu JY(刘杰英)1,2 ; Liu, BF3; Qiao, EL3; Mineshige, S4; Liu, JY (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
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| 发表期刊 | ASTROPHYSICAL JOURNAL
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| 2012-08-01 | |
| 卷号 | 754期号:2 |
| DOI | 10.1088/0004-637X/754/2/81 |
| 产权排序 | 第1完成单位 |
| 收录类别 | SCI |
| 关键词 | Galaxies: Active Accretion X-rays: Galaxies Accretion Disks |
| 摘要 | We investigate the accretion process in high-luminosity active galactic nuclei (HLAGNs) in the scenario of the disk evaporation model. Based on this model, the thin disk can extend down to the innermost stable circular orbit (ISCO) at accretion rates higher than 0.02(M) over dot(Edd) while the corona is weak since part of the coronal gas is cooled by strong inverse Compton scattering of the disk photons. This implies that the corona cannot produce as strong X-ray radiation as observed in HLAGNs with large Eddington ratio. In addition to the viscous heating, other heating to the corona is necessary to interpret HLAGN. In this paper, we assume that a part of accretion energy released in the disk is transported into the corona, heating up the electrons, and is thereby radiated away. For the first time, we compute the corona structure with additional heating, fully taking into account the mass supply to the corona, and find that the corona could indeed survive at higher accretion rates and that its radiation power increases. The spectra composed of bremsstrahlung and Compton radiation are also calculated. Our calculations show that the Compton-dominated spectrum becomes harder with the increase of energy fraction (f) liberating in the corona, and the photon index for hard X-ray (2-10 keV) is 2.2 < Gamma < 2.7. We discuss possible heating mechanisms for the corona. Combining the energy fraction transported to the corona with the accretion rate by magnetic heating, we find that the hard X-ray spectrum becomes steeper at a larger accretion rate and the bolometric correction factor (L-bol/L2-10keV) increases with increasing accretion rate for f < 8/35, which is roughly consistent with the observational results. |
| 项目资助者 | National Natural Science Foundation of China [11033007, 11173029] ; National Basic Research Program of China-973 Program [2009CB824800] |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 0004-637X |
| URL | 查看原文 |
| 归档日期 | 2012-08-06 |
| WOS记录号 | WOS:000306666700002 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | ADVECTION-DOMINATED ACCRETION ; RADIATION-MAGNETOHYDRODYNAMIC SIMULATIONS ; RECONNECTION-HEATED CORONA ; X-RAY BINARIES ; BLACK-HOLE ; ENERGY-DISTRIBUTIONS ; SEYFERT-GALAXIES ; MAGNETIC-FIELD ; SAGITTARIUS-A ; FLOWS |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/5219 |
| 专题 | 恒星物理研究组 中国科学院天体结构与演化重点实验室 |
| 通讯作者 | Liu, JY (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China. |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China 3.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China 4.Department of Astronomy, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan |
| 第一作者单位 | 中国科学院云南天文台 |
| 推荐引用方式 GB/T 7714 | Liu JY,Liu, BF,Qiao, EL,et al. THE STRUCTURE AND SPECTRAL FEATURES OF A THIN DISK AND EVAPORATION-FED CORONA IN HIGH-LUMINOSITY ACTIVE GALACTIC NUCLEI[J]. ASTROPHYSICAL JOURNAL,2012,754(2). |
| APA | Liu JY,Liu, BF,Qiao, EL,Mineshige, S,&Liu, JY .(2012).THE STRUCTURE AND SPECTRAL FEATURES OF A THIN DISK AND EVAPORATION-FED CORONA IN HIGH-LUMINOSITY ACTIVE GALACTIC NUCLEI.ASTROPHYSICAL JOURNAL,754(2). |
| MLA | Liu JY,et al."THE STRUCTURE AND SPECTRAL FEATURES OF A THIN DISK AND EVAPORATION-FED CORONA IN HIGH-LUMINOSITY ACTIVE GALACTIC NUCLEI".ASTROPHYSICAL JOURNAL 754.2(2012). |
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