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Constraining broad-line regions from time lags of broad emission lines relative to radio emission
Liu, HT; Bai, JM; Wang JM(王建民); Wang, JM; Li, SK
2011
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号418期号:1页码:90-95
通讯作者[Liu, H. T. ; Bai, J. M. ; Li, S. K.] Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Yunnan, Peoples R China ; [Liu, H. T. ; Bai, J. M. ; Li, S. K.] Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Yunnan, Peoples R China ; [Wang, J. M.] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China ; [Wang, J. M.] Chinese Acad Sci, Ctr Phys Theor, Sci Facil, Beijing 100049, Peoples R China
文章类型Article
摘要In this paper, a new method is proposed to estimate the broad-line region sizes of ultraviolet (UV) lines RuvBLR. It is applied to 3C 273. First, we derive the time lags of radio emission relative to broad emission lines Lya and C iv by the z-transformed discrete correlation function (ZDCF) method. The broad lines lag the 5-, 8-, 15-, 22- and 37-GHz emission. The measured lags tuvob are of the order of years. For a given line, tuvob decreases as the radio frequency increases. This trend results from the radiative cooling of relativistic electrons. Both UV lines have a lag of tuvob=-2.74+0.06- 0.25 yr relative to the 37-GHz emission. These results are consistent with those derived from the Balmer lines in Paper I. Secondly, we derive the time lags of the lines Lya, C iv, H, H beta and Ha relative to the 37-GHz emission by the flux randomization/random subset selection (FR/RSS) Monte Carlo method. The measured lags are tob=-3.40+0.31- 0.05, -3.40+0.41- 0.14, -2.06+0.36- 0.92, -3.40+1.15- 0.20 and -3.56+0.35- 0.18 yr for the lines Lya, C iv, H, H beta and Ha, respectively. These estimated lags are consistent with those derived by the ZDCF method within the uncertainties. Based on the new method, we derive RuvBLR= 2.54+0.71- 0.35 to 4.01+0.90- 1.16 and 2.54+0.80- 0.43 to 4.01+0.98- 1.24 light-years for the Lya and C iv lines, respectively. Considering the uncertainties, these estimated sizes are consistent with those obtained in the classical reverberation mapping for the UV and the Balmer lines. This indicates that their emitting regions are not separated so large as in the classical mapping of the UV and optical lines. These results seem to depart from the stratified ionization structures obtained in the classical mapping.
关键词galaxies: active galaxies: jets quasars: emission lines quasars: individual: 3C 273 radio continuum: galaxies
学科领域Astronomy & Astrophysics
DOI10.1111/j.1365-2966.2011.19463.x
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语种英语
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000297045700039
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被引频次:5[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/236815
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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Liu, HT,Bai, JM,Wang JM,et al. Constraining broad-line regions from time lags of broad emission lines relative to radio emission[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,418(1):90-95.
APA Liu, HT,Bai, JM,王建民,Wang, JM,&Li, SK.(2011).Constraining broad-line regions from time lags of broad emission lines relative to radio emission.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,418(1),90-95.
MLA Liu, HT,et al."Constraining broad-line regions from time lags of broad emission lines relative to radio emission".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 418.1(2011):90-95.
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