THE OPTICAL VARIABILITY OF SDSS QUASARS FROM MULTI-EPOCH SPECTROSCOPY. I. RESULTS FROM 60 QUASARS WITH >= SIX-EPOCH SPECTRA

	THE OPTICAL VARIABILITY OF SDSS QUASARS FROM MULTI-EPOCH SPECTROSCOPY. I. RESULTS FROM 60 QUASARS WITH >= SIX-EPOCH SPECTRA
	Guo, Hengxiao 1,2; Gu, Minfeng1
刊名	ASTROPHYSICAL JOURNAL
	2014-09-01
卷号	792 期号:1 页码:33-45
关键词	galaxies: active quasars: general techniques: spectroscopic
通讯作者	顾敏峰
英文摘要	In a sample of 60 quasars selected from the Sloan Digital Sky Survey with at least six-epoch spectroscopy, we investigate the variability of emission lines and continuum luminosity at various aspects. A strong anti-correlation between the variability and continuum luminosity at 2500 angstrom is found for the sample, which is consistent with previous works. In individual sources, we find that half of the sample objects follow the trend of being bluer when brighter, while the remaining half follow the redder-when-brighter (RWB) trend. Although the mechanism for RWB is unclear, the effects of host galaxy contribution due to seeing variations cannot be completely ruled out. As expected from the photoionization model, the positive correlations between the broad emission line and continuum luminosity are found in most individual sources, as well as for the whole sample. We confirm the Baldwin effect in most individual objects and the whole sample, while a negative Baldwin effect is also found in several quasars, which can be at least partly (if not all) due to the host galaxy contamination. We find positive correlations between the broad emission line luminosity and line width in most individual quasars, as well as the whole sample, implying a line base that is more variable than the line core.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ACTIVE GALACTIC NUCLEI ; DIGITAL SKY SURVEY ; 7TH DATA RELEASE ; EMISSION-LINE LUMINOSITY ; BLACK-HOLE MASSES ; C-IV ; CONTINUUM CORRELATIONS ; WAVELENGTH DEPENDENCE ; RADIO QUASARS ; STRIPE 82
收录类别	SCI
语种	英语
WOS记录号	WOS:000341172100033
公开日期	2015-02-14
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/15738]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Guo, Hengxiao,Gu, Minfeng. THE OPTICAL VARIABILITY OF SDSS QUASARS FROM MULTI-EPOCH SPECTROSCOPY. I. RESULTS FROM 60 QUASARS WITH >= SIX-EPOCH SPECTRA[J]. ASTROPHYSICAL JOURNAL,2014,792(1):33-45.
APA	Guo, Hengxiao,&Gu, Minfeng.(2014).THE OPTICAL VARIABILITY OF SDSS QUASARS FROM MULTI-EPOCH SPECTROSCOPY. I. RESULTS FROM 60 QUASARS WITH >= SIX-EPOCH SPECTRA.ASTROPHYSICAL JOURNAL,792(1),33-45.
MLA	Guo, Hengxiao,et al."THE OPTICAL VARIABILITY OF SDSS QUASARS FROM MULTI-EPOCH SPECTROSCOPY. I. RESULTS FROM 60 QUASARS WITH >= SIX-EPOCH SPECTRA".ASTROPHYSICAL JOURNAL 792.1(2014):33-45.