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Optical spectral index-luminosity relation for the 17 mapped Palomar-Green quasars
Zhang, Xue-Guang1,2
2013-11-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume435Issue:3Pages:2141-2151
Corresponding AuthorMei, LJ (通讯作者) Nanchang Univ, Sch Sci, Nanchang 330031, Peoples R China.
AbstractIn this paper, the optical spectra index-luminosity relationship is checked for the well-known 17 individually mapped quasi-stellar objects (QSOs), in order to give one more clearer conclusion on the so far conflicting dependence of the spectral index on the luminosity for an active galactic nucleus (AGN). Unlike the global relationships based on the colour difference (photometry parameters) for samples of AGNs, a more reliable relationship is determined for the multi-epoch observed individually mapped QSOs with no contamination from the host galaxies, the line variabilities and the very different central properties. The final confirmed results are as follows. (i) No strong dependence of the optical spectral index on the continuum luminosity can be found for all 17 QSOs, besides two objects (PG 0026 and PG 1613) that have some weak trends (with 3 Sigma confidence level) for the relationship. In other words, the common expectation that 'AGNs get bluer when they get brighter' is not so common. (ii) There are very different damped intrinsic variability time-scales for the variability modes of the optical spectral index and the continuum emission, through the well-applied damped random walk method for the AGN variability. In other words, there are some different intrinsic mechanisms controlling the variabilities of the optical spectral index and the power-law AGN continuum emission. Therefore, the much weaker dependence of the optical spectral index on the continuum luminosity can be further confirmed.
KeywordGalaxies: Active Galaxies: Nuclei Quasars: Emission Lines
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1093/mnras/stt1432
WOS KeywordACTIVE GALACTIC NUCLEI ; BROAD-LINE REGION ; DAMPED RANDOM-WALK ; BLACK-HOLE MASSES ; FE II EMISSION ; SDSS STRIPE 82 ; RADIO SOURCES ; X-RAY ; COLOR VARIABILITY ; DARK-MATTER
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000325773000025
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9830
Collection空间目标与碎片观测研究基地
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Ctr Antarctic Astron, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Xue-Guang. Optical spectral index-luminosity relation for the 17 mapped Palomar-Green quasars[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,435(3):2141-2151.
APA Zhang, Xue-Guang.(2013).Optical spectral index-luminosity relation for the 17 mapped Palomar-Green quasars.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,435(3),2141-2151.
MLA Zhang, Xue-Guang."Optical spectral index-luminosity relation for the 17 mapped Palomar-Green quasars".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 435.3(2013):2141-2151.
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