THE STRUCTURE AND SPECTRAL FEATURES OF A THIN DISK AND EVAPORATION-FED CORONA IN HIGH-LUMINOSITY ACTIVE GALACTIC NUCLEI
文献类型：期刊论文
| 作者 | Liu, J. Y.1,2; Liu, B. F.3; Qiao, E. L.3; Mineshige, S.4 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2012-08-01 |
| 卷号 | 754期号:2 |
| 关键词 | accretion, accretion disks galaxies: active X-rays: galaxies |
| 英文摘要 | 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. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000306666700002 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6300]  |
| 专题 | 国家天文台_空间科学研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China 2.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 4.Kyoto Univ, Grad Sch Sci, Dept Astron, Kyoto 6068502, Japan |
| 推荐引用方式 GB/T 7714 | Liu, J. Y.,Liu, B. F.,Qiao, E. L.,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, J. Y.,Liu, B. F.,Qiao, E. L.,&Mineshige, S..(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, J. Y.,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). |
入库方式： OAI收割
来源：国家天文台
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