Tests for standard accretion disk models by variability in active galactic nuclei

doi:10.1086/529361

YNAO OpenIR > 南方基地

	Tests for standard accretion disk models by variability in active galactic nuclei
	Liu HT(刘洪涛)1 ; Bai JM(白金明)1 ; Zhao XH(赵晓红)1 ; Ma, L 2; Liu, HT (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Yunnan, Peoples R China.
发表期刊	ASTROPHYSICAL JOURNAL
	2008-04-20
卷号	677 期号:2 页码:884-894
DOI	10.1086/529361
产权排序	第1完成单位
收录类别	SCI
关键词	Accretion Accretion Disks Black Hole Physics Galaxies : Active Galaxies : Seyfert Quasars : General
摘要	In this paper, standard accretion disk models of active galactic nuclei (AGNs) are tested using light curves of 26 objects that have been well observed using reverberation mapping. Timescales of variations are estimated by the most common definition of the variability timescale and the zero-crossing time of the autocorrelation function of the optical light curves for each source. The timescales of variations measured by the two methods are consistent with each other. If the typical value of the viscosity parameter alpha similar to 0.1 is adopted, the measured optical variability timescales are closest to the thermal timescales of the standard disks. If alpha is allowed to range from similar to 0.03 to similar to 0.2, the measured timescales are consistent with the thermal timescales of the standard disks. There is a linear relation between the measured variability timescales and black hole masses; this linear relation is qualitatively consistent with expectation of the standard accretion disk models. The time lags measured by the z-transformed discrete correlation function (ZDCF) between different bands are on the order of days. The measured time lags of NGC 4151 and NGC 7469 are marginally consistent with the time lags estimated in the case of continuum thermal reprocessing for the standard accretion disk models. However, the measured time lags of NGC 5548 and Fairall 9 are unlikely to be the case of continuum thermal reprocessing. Our results are unlikely to be inconsistent with, or are likely to be conditionally in favor of, the standard accretion disk models of AGNs.
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	2008-04-28
WOS记录号	WOS:000254898000007
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	BROAD-LINE REGION ; SHORT-TIMESCALE VARIABILITY ; BLACK-HOLE MASSES ; GALAXY 3C 390.3 ; X-RAY-EMISSION ; MULTIWAVELENGTH OBSERVATIONS ; ULTRAVIOLET OBSERVATIONS ; NGC 4151 ; CONTINUUM VARIABILITY ; OPTICAL VARIABILITY
引用统计	被引频次：38[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/114a53/5384
专题	南方基地
通讯作者	Liu, HT (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Yunnan, Peoples R China.
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming, Yunnan 650011, China 2.Physics Department, Yunnan Normal University, Kunming 650092, China
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 HT,Bai JM,Zhao XH,et al. Tests for standard accretion disk models by variability in active galactic nuclei[J]. ASTROPHYSICAL JOURNAL,2008,677(2):884-894.
APA	Liu HT,Bai JM,Zhao XH,Ma, L,&Liu, HT .(2008).Tests for standard accretion disk models by variability in active galactic nuclei.ASTROPHYSICAL JOURNAL,677(2),884-894.
MLA	Liu HT,et al."Tests for standard accretion disk models by variability in active galactic nuclei".ASTROPHYSICAL JOURNAL 677.2(2008):884-894.

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