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Is the dependence of spectral index on luminosity real in optically selected AGN samples ?
Tang, SM; Zhang SN(张双南); Zhang, SN; Hopkins, PF
2007
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume377Issue:3Pages:1113-1121
Corresponding AuthorTsinghua Univ, Dept Phys, Beijing 100084, Peoples R China ; Tsinghua Univ, Ctr Astrophys, Beijing 100084, Peoples R China ; Univ Alabama, Dept Phys, Huntsville, AL 35899 USA ; NASA, George C Marshall Space Flight Ctr, Space Sci Lab, Huntsville, AL 35812 USA ; Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China ; Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
SubtypeArticle
AbstractWe critically examine the dependence of spectral index on luminosity in optically selected AGN samples. An analysis of optically selected high-z quasars showed an anticorrelation of alpha(OX), the spectral index between the rest-frame 2500 angstrom and 2 keV, with optical luminosity. We examine this relationship by means of Monte Carlo simulations and conclude that a constant alpha(OX) independent of optical luminosity is still consistent with this high-z sample. We further find that contributions of large dispersions and narrow range of optical luminosity are most important for the apparent, yet artificial, alpha(OX)-l(o) correlation reported. We also examine another, but more complete, low-z optical selected AGN sub-sample from Steffen et al., and our analysis shows that a constant alpha(OX) independent of optical luminosity is also consistent with the data. By comparing X-ray and optical luminosity functions, we find that a luminosity-independent alpha(OX) is in fact more preferred than the luminosity-dependent alpha(OX) model. We also discuss the selection effects caused by flux limits, which might systematically bias the l(X)-l(o) relation and cause discrepancy in optically selected and X-ray selected AGN samples. To correctly establish a dependence of alpha(OX) of AGNs on their luminosity, a larger and more complete sample is needed and consequences of luminosity dispersions and selection effects in flux-limited samples must be taken into account properly.
Keywordmethods : statistical galaxies : active quasars : general X-rays : galaxies
Subject AreaAstronomy & Astrophysics
DOI10.1111/j.1365-2966.2007.11589.x
URL查看原文
Indexed ByINSPIREHEP ; ADS
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000246367000013
ADS Bibcode2007MNRAS.377.1113T
ADS URLhttps://ui.adsabs.harvard.edu/abs/2007MNRAS.377.1113T
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2007MNRAS.377.1113T/citations
inspireid743804
inspireURLhttps://inspirehep.net/literature/743804
Citation statistics
Cited Times:14 [INSPIRE]
Cited Times:16 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/239068
Collection粒子天体物理中心
Affiliation中国科学院高能物理研究所
First Author AffilicationInstitute of High Energy
Recommended Citation
GB/T 7714
Tang, SM,Zhang SN,Zhang, SN,et al. Is the dependence of spectral index on luminosity real in optically selected AGN samples ?[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2007,377(3):1113-1121.
APA Tang, SM,张双南,Zhang, SN,&Hopkins, PF.(2007).Is the dependence of spectral index on luminosity real in optically selected AGN samples ?.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,377(3),1113-1121.
MLA Tang, SM,et al."Is the dependence of spectral index on luminosity real in optically selected AGN samples ?".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 377.3(2007):1113-1121.
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