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THE DISK EVAPORATION MODEL FOR THE SPECTRAL FEATURES OF LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI
Qiao, EL1; Liu, BF1; Panessa, F2; Liu JY(刘杰英)3,4
发表期刊ASTROPHYSICAL JOURNAL
2013-11-10
卷号777期号:2
DOI10.1088/0004-637X/777/2/102
产权排序第3完成单位
收录类别SCI
关键词accretion, accretion disks black hole physics galaxies: active X-rays: galaxies
摘要

Observations show that the accretion flows in low-luminosity active galactic nuclei probably have a two-component structure with an inner, hot, optically thin, advection-dominated accretion flow (ADAF) and an outer, truncated, cool, optically thick accretion disk. As shown by Taam et al., the truncation radius as a function of mass accretion rate is strongly affected by including the magnetic field within the framework of disk evaporation model, i.e., an increase in the magnetic field results in a smaller truncation radius of the accretion disk. In this work, we calculate the emergent spectrum of an inner ADAF + an outer truncated accretion disk around a supermassive black hole based on the prediction by Taam et al.. It is found that an increase in the magnetic field from beta = 0.8 to beta = 0.5 (with magnetic pressure p(m) = B-2/8 pi = (1 - beta)p(tot), p(tot) = p(gas) + p(m)) results in a factor of similar to 8.7 increase in the luminosity from the truncated accretion disk. Meanwhile, results of the peak emission of the truncated accretion disk shift toward a a factor of similar to 5 higher frequency. We found that the equipartition of gas pressure to magnetic pressure, i.e., beta = 0.5, failed to explain the observed anti-correlation between (L2-10) (keV)/L-Edd and the bolometric correction kappa(2-10 keV) (with kappa(2-10 keV) = L-bol/L2-10 keV). The emergent spectra for larger values of beta = 0.8 or beta = 0.95 can explain the observed L2-10 keV/L-Edd-kappa(2-10 keV) correlation. We argue that in the disk evaporation model, the electrons in the corona are assumed to be heated only by a transfer of energy from the ions to electrons via Coulomb collisions, which is reasonable for accretion with a lower mass accretion rate. Coulomb heating is the dominated heating mechanism for the electrons only if the magnetic field is strongly sub-equipartition, which is roughly consistent with observations.

资助项目National Natural Science Foundation of China[11033007] ; National Natural Science Foundation of China[11173029] ; National Natural Science Foundation of China[11303046] ; National Natural Science Foundation of China[U1231203] ; National Basic Research Program of China-973 Program[2009CB824800]
项目资助者National Natural Science Foundation of China[11033007, 11173029, 11303046, U1231203] ; National Basic Research Program of China-973 Program[2009CB824800]
语种英语
学科领域天文学 ; 天体物理学 ; 高能天体物理学 ; 星系与宇宙学
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS记录号WOS:000326218800021
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ADVECTION-DOMINATED ACCRETION ; RADIATIVELY INEFFICIENT ACCRETION ; X-RAY BINARIES ; BLACK-HOLE BINARIES ; BIG BLUE BUMP ; ENERGY-DISTRIBUTIONS ; EDDINGTON RATIO ; NUMERICAL-SIMULATION ; EFFICIENCY ACCRETION ; SEYFERT-GALAXIES
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被引频次:18[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5229
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Qiao, EL
作者单位1.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
2.INAF-Istituto di Astrofisica e Planetologia Spaziali di Roma (IAPS), Via del Fosso del Cavaliere 100, I-00133 Roma, Italy
3.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, China
4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
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Qiao, EL,Liu, BF,Panessa, F,et al. THE DISK EVAPORATION MODEL FOR THE SPECTRAL FEATURES OF LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI[J]. ASTROPHYSICAL JOURNAL,2013,777(2).
APA Qiao, EL,Liu, BF,Panessa, F,&Liu JY.(2013).THE DISK EVAPORATION MODEL FOR THE SPECTRAL FEATURES OF LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI.ASTROPHYSICAL JOURNAL,777(2).
MLA Qiao, EL,et al."THE DISK EVAPORATION MODEL FOR THE SPECTRAL FEATURES OF LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI".ASTROPHYSICAL JOURNAL 777.2(2013).
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