A measure of cosmological distance using the C-IV Baldwin effect in quasars

doi:10.1051/0004-6361/202244644

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	A measure of cosmological distance using the C-IV Baldwin effect in quasars
	Huang, Long 1,2; Wang, Hui 3; Gao, Zhifu4 ; Zeng, Xiangyun 5; Chang, Zhangyong 1,2
	2023-06-16
Source Publication	ASTRONOMY & ASTROPHYSICS
ISSN	0004-6361
Volume	674 Pages:A163
Contribution Rank	4
Abstract	We use the anticorrelation between the equivalent width (EW) of the CIV 1549 angstrom emission line and the continuum luminosity in the quasars rest frame (Baldwin e ffect) to measure their luminosity distance as well as estimate cosmological parameters. We obtain a sample of 471 Type I quasars with the UV-optical spectra and EW (C iv) measurements in the redshift range of 2.3 < z < 7.1 including 25 objects at 5 < z < 7.1, which can be used to investigate the C iv Baldwin e ffect and determine cosmological luminosity distance. The relation EW(CIV) proportional to(lambda L-lambda)(gamma) can be applied to check the inverse correlation between the CIV EW and L-lambda of quasars and give their distance, and the data suggest that the EW of C iv is inversely correlated with continuum monochromatic luminosities. On the other hand, we also consider dividing the Type I quasar sample into various redshift bins, which can be used to check if the CIV EW-luminosity relation depends on the redshift. Finally, we apply a combination of Type I quasars and Type Ia supernovae (SNIa) of the Pantheon sample to test the property of dark energy concerning whether or not its density deviates from the constant, and give the statistical results.
Keyword	dark energy quasars: emission lines quasars: general distance scale
DOI	10.1051/0004-6361/202244644
Indexed By	SCI
Language	英语
WOS Keyword	BLACK-HOLE MASSES ; EMISSION-LINE ; DATA RELEASE ; RADIO-LOUD ; CATALOG ; SPECTRA ; LIGHT ; IA ; CONSTRAINTS ; INDICATORS
Funding Project	National Natural Science Foundation of China[12203029]
WOS Research Area	Astronomy & Astrophysics
WOS Subject	Astronomy & Astrophysics
WOS ID	WOS:001024440700055
Publisher	EDP SCIENCES S A
Funding Organization	National Natural Science Foundation of China
Citation statistics	Cited Times:2[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.xao.ac.cn/handle/45760611-7/5431
Collection	射电天文研究室_脉冲星研究团组
Corresponding Author	Huang, Long
Affiliation	1.Jiujiang Univ, Coll Sci, Jiujiang 332000, Peoples R China 2.Key Lab Funct Microscale Mat Jiangxi Prov, Jiujiang 332000, Peoples R China 3.China West Normal Univ, Sch Phys & Astron, Nanchong 637000, Peoples R China 4.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 5.China Three Gorges Univ, Coll Sci, Yichang 443000, Peoples R China
Recommended Citation GB/T 7714	Huang, Long,Wang, Hui,Gao, Zhifu,et al. A measure of cosmological distance using the C-IV Baldwin effect in quasars[J]. ASTRONOMY & ASTROPHYSICS,2023,674:A163.
APA	Huang, Long,Wang, Hui,Gao, Zhifu,Zeng, Xiangyun,&Chang, Zhangyong.(2023).A measure of cosmological distance using the C-IV Baldwin effect in quasars.ASTRONOMY & ASTROPHYSICS,674,A163.
MLA	Huang, Long,et al."A measure of cosmological distance using the C-IV Baldwin effect in quasars".ASTRONOMY & ASTROPHYSICS 674(2023):A163.

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