| APPLICATION OF THE DISK EVAPORATION MODEL TO ACTIVE GALACTIC NUCLEI | |
Liu BF(刘碧芳)1 ; Taam, RE2,3,4; Liu, BF (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
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| 发表期刊 | ASTROPHYSICAL JOURNAL
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| 2009-12-10 | |
| 卷号 | 707期号:1页码:233-242 |
| DOI | 10.1088/0004-637X/707/1/233 |
| 产权排序 | 第1完成单位 |
| 收录类别 | SCI |
| 关键词 | Black Hole Physics Accretion Galaxies: Active Accretion Disks X-rays: Galaxies |
| 摘要 | The disk corona evaporation model extensively developed for the interpretation of observational features of black hole X-ray binaries (BHXRBs) is applied to active galactic nuclei (AGNs). Since the evaporation of gas in the disk can lead to its truncation for accretion rates less than a maximal evaporation rate, the model can naturally account for the soft spectrum in high-luminosity AGNs and the hard spectrum in low-luminosity AGNs. The existence of two different luminosity levels describing transitions from the soft to hard state and from the hard to soft state in BHXRBs, when applied to AGNs, suggests that AGNs can be in either spectral state within a range of luminosities. For example, at a viscosity parameter, alpha, equal to 0.3, the Eddington ratio from the hard-to-soft transition and from the soft-to-hard transition occurs at 0.027 and 0.005, respectively. The differing Eddington ratios result from the importance of Compton cooling in the latter transition, in which the cooling associated with soft photons emitted by the optically thick inner disk in the soft spectral state inhibits evaporation. When the Eddington ratio of the AGN lies below the critical value corresponding to its evolutionary state, the disk is truncated. With decreasing Eddington ratios, the inner edge of the disk increases to greater distances from the black hole with a concomitant increase in the inner radius of the broad-line region, R(BLR). The absence of an optically thick inner disk at low luminosities (L) gives rise to region in the R(BLR)-L plane for which the relation R(BLR) proportional to L(1/2) inferred at high luminosities is excluded. As a result, a lower limit to the accretion rate is predicted for the observability of broad emission lines, if the broad-line region is associated with an optically thick accretion disk. Thus, true Seyfert 2 galaxies may exist at very low accretion rates/luminosities. The differences between BHXRBs and AGNs in the framework of the disk corona model are discussed, and possible modifications to the model are briefly suggested. |
| 项目资助者 | National Natural Science Foundation of China [10533050, 10773028] ; National Basic Research Program of China [2009CB824800] ; Theoretical Institute for Advanced Research in Astrophysics (TIARA) |
| 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 | 2010-01-27 |
| WOS记录号 | WOS:000272162900019 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | ADVECTION-DOMINATED ACCRETION ; X-RAY BINARIES ; BROAD-LINE REGION ; RADIATIVELY INEFFICIENT ACCRETION ; RADIUS-LUMINOSITY RELATIONSHIP ; SPECTRAL ENERGY-DISTRIBUTIONS ; RECONNECTION-HEATED CORONA ; GEOMETRICALLY THIN DISKS ; HOST-GALAXY STARLIGHT ; BLACK-HOLE ACCRETION |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/4971 |
| 专题 | 高能天体物理研究组 |
| 通讯作者 | Liu, BF (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China. |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, China 2.Academia Sinica Institute of Astronomy and Astrophysics -TIARA, P.O. Box 23-141, Taipei 10617, Taiwan 3.Academia Sinica Institute of Astronomy and Astrophysics/National Tsing Hua University-TIARA, Hsinchu, Taiwan 4.Northwestern University, Department of Physics and Astronomy, 2131 Tech Drive, Evanston, IL 60208, USA |
| 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 BF,Taam, RE,Liu, BF . APPLICATION OF THE DISK EVAPORATION MODEL TO ACTIVE GALACTIC NUCLEI[J]. ASTROPHYSICAL JOURNAL,2009,707(1):233-242. |
| APA | Liu BF,Taam, RE,&Liu, BF .(2009).APPLICATION OF THE DISK EVAPORATION MODEL TO ACTIVE GALACTIC NUCLEI.ASTROPHYSICAL JOURNAL,707(1),233-242. |
| MLA | Liu BF,et al."APPLICATION OF THE DISK EVAPORATION MODEL TO ACTIVE GALACTIC NUCLEI".ASTROPHYSICAL JOURNAL 707.1(2009):233-242. |
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