The relation between the optical spectral slope and the luminosity for 17 Palomar-Green quasi-stellar objects
Pu, X; Bian WH(卞维豪); Bian, W; Huang, K
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2006
卷号372期号:1页码:#REF!
关键词techniques : spectroscopic galaxies : active galaxies : nuclei
学科分类Astronomy & Astrophysics
DOI10.1111/j.1365-2966.2006.10850.x
通讯作者Pu, X (reprint author), Nanjing Normal Univ, Dept Phys, Nanjing 210097, Peoples R China.
文章类型Article
英文摘要Using 7.5-yr spectroscopic monitoring data of a sample of 17 Palomar-Green quasi-stellar objects (PG QSOs) (z = 0.061-0.371), we obtain the optical spectral slope for each object at all epochs by a power-law fit to the spectra in continuum bands. All of these 17 PG QSOs exhibit obvious spectral-slope variability. Most of the 17 objects show anticorrelation between the spectral slope and the rest-frame 5100-angstrom continuum flux, while five of them exhibit strong anticorrelation (correlation coefficient R larger than 0.5). For the ensemble of these 17 PG QSOs, a strong anticorrelation between the average spectral slope and the average rest-frame 5100-angstrom luminosity is found, while no correlation is found between the spectral slope and the Eddington ratio. A median anticorrelation between spectral-slope changes and continuum-flux variations is also found which indicates a hardening of the spectrum during bright phases. Accretion disc (jet) instability models with other mechanisms associated with changes in the accretion processes are promising.
类目[WOS]Astronomy & Astrophysics
收录类别SCI
WOS记录号WOS:000240823800023
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被引频次:6[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/311005/227173
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
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Pu, X,Bian WH,Bian, W,et al. The relation between the optical spectral slope and the luminosity for 17 Palomar-Green quasi-stellar objects[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2006,372(1):#REF!.
APA Pu, X,卞维豪,Bian, W,&Huang, K.(2006).The relation between the optical spectral slope and the luminosity for 17 Palomar-Green quasi-stellar objects.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,372(1),#REF!.
MLA Pu, X,et al."The relation between the optical spectral slope and the luminosity for 17 Palomar-Green quasi-stellar objects".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 372.1(2006):#REF!.
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