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ON PROBING THE PROPERTIES OF QSOs THROUGH THEIR PROXIMITY EFFECTS ON THE INTERGALACTIC MEDIUM
Lu, Youjun1; Yu, Qingjuan2
2011-07-20
Source PublicationASTROPHYSICAL JOURNAL
Volume736Issue:1
AbstractThe proximity effect (PE) of QSOs is believed to be useful in constraining the QSO lifetime. Observations of the PE so far, however, give apparently contradictory results-some are consistent with a long QSO lifetime (greater than or similar to a few 10(7) yr), but others appear to be only consistent with a short QSO lifetime (less than or similar to 10(6) yr). In this paper, we show that this apparent contradiction may be solved by simultaneously taking into account both the effect due to the density enhancement in the QSO near zones and that due to the obscuration of the tori associated with the QSOs, using a large number of Monte Carlo generated synthetic Ly alpha forest spectra. We demonstrate that the QSO properties and environment can be constrained simultaneously by the transverse PE (TPE) and the line-of-sight PE of bright type 1 QSOs together. The current available measurements on the PEs of type 1 QSOs suggest that (1) the density is significantly enhanced in the vicinity of the QSOs; (2) the QSO lifetime is consistent with being as large as a few 10(7) yr, and a substantially shorter lifetime (e. g., less than or similar to 10(6) yr) is not required; and (3) the half opening angle of the tori associated with QSOs is similar to 60 degrees, consistent with some other independent estimates. Our simulations also show that the TPE of type 2 QSOs can be significantly different from that of type 1 QSOs, which may be useful to put further constraints on the QSO properties and the QSO environment.
KeywordBlack Hole Physics Intergalactic Medium Quasars: Absorption Lines Quasars: General
DOI10.1088/0004-637X/736/1/49
Indexed BySCI
Language英语
WOS IDWOS:000292645600049
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7929
Collection星系宇宙学研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100891, Peoples R China
Recommended Citation
GB/T 7714
Lu, Youjun,Yu, Qingjuan. ON PROBING THE PROPERTIES OF QSOs THROUGH THEIR PROXIMITY EFFECTS ON THE INTERGALACTIC MEDIUM[J]. ASTROPHYSICAL JOURNAL,2011,736(1).
APA Lu, Youjun,&Yu, Qingjuan.(2011).ON PROBING THE PROPERTIES OF QSOs THROUGH THEIR PROXIMITY EFFECTS ON THE INTERGALACTIC MEDIUM.ASTROPHYSICAL JOURNAL,736(1).
MLA Lu, Youjun,et al."ON PROBING THE PROPERTIES OF QSOs THROUGH THEIR PROXIMITY EFFECTS ON THE INTERGALACTIC MEDIUM".ASTROPHYSICAL JOURNAL 736.1(2011).
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