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HARD X-RAY PHOTON INDEX AS AN INDICATOR OF BOLOMETRIC CORRECTION IN ACTIVE GALACTIC NUCLEI
Zhou, Xin-Lin; Zhao, Yong-Heng
2010-09-10
Source PublicationASTROPHYSICAL JOURNAL LETTERS
Volume720Issue:2Pages:L206-L210
AbstractWe propose the rest-frame 2-10 keV photon index, Gamma(2-10) (keV), acting as an indicator of the bolometric correction, L(bol)/L(2-10) (keV) (where L(bol) is the bolometric luminosity and L(2-10) (keV) is the rest-frame 2-10 keV luminosity), in radio-quiet active galactic nuclei (AGNs). Correlations between Gamma(2-10) (keV) and both bolometric correction and Eddington ratio are presented, based on simultaneous X-ray, UV, and optical observations of reverberation-mapped AGNs. These correlations can be compared with those for high-redshift AGNs to check for any evolutionary effect. Assuming no evolutionary effect in AGNs' spectral properties, together with the independent estimates of L(2-10) (keV), the bolometric correction, Eddington ratio, and black hole (BH) mass can all be estimated from these correlations for high-redshift AGNs, with the mean uncertainty of a factor of 2-3. If there are independent estimates of BH masses, Gamma(2-10) (keV) for high-redshift AGNs can be used to determine their true L(bol) and L(2-10) (keV), and in conjunction with the redshift can be potentially used to place constraints on cosmology by comparison with the rest-frame 2-10 keV flux. We find that the true L(2-10) (keV) estimated from Gamma(2-10) (keV) for the brightest Type I AGNs with z < 1 in the Lockman Hole is generally in agreement with the observed L(2-10) (keV). However, there are still many uncertainties, such as the accurate determination of the intrinsic Gamma(2-10) (keV) for distant AGNs and the large uncertainty in the luminosities
KeywordBlack Hole Physics Cosmology: Observations Galaxies: Distances And Redshifts X-rays: Diffuse Background
DOI10.1088/2041-8205/720/2/L206
Indexed BySCI
Language英语
WOS IDWOS:000281610200016
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7743
Collection光学天文研究部
AffiliationChinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Zhou, Xin-Lin,Zhao, Yong-Heng. HARD X-RAY PHOTON INDEX AS AN INDICATOR OF BOLOMETRIC CORRECTION IN ACTIVE GALACTIC NUCLEI[J]. ASTROPHYSICAL JOURNAL LETTERS,2010,720(2):L206-L210.
APA Zhou, Xin-Lin,&Zhao, Yong-Heng.(2010).HARD X-RAY PHOTON INDEX AS AN INDICATOR OF BOLOMETRIC CORRECTION IN ACTIVE GALACTIC NUCLEI.ASTROPHYSICAL JOURNAL LETTERS,720(2),L206-L210.
MLA Zhou, Xin-Lin,et al."HARD X-RAY PHOTON INDEX AS AN INDICATOR OF BOLOMETRIC CORRECTION IN ACTIVE GALACTIC NUCLEI".ASTROPHYSICAL JOURNAL LETTERS 720.2(2010):L206-L210.
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