BIASES IN PHYSICAL PARAMETER ESTIMATES THROUGH DIFFERENTIAL LENSING MAGNIFICATION

	BIASES IN PHYSICAL PARAMETER ESTIMATES THROUGH DIFFERENTIAL LENSING MAGNIFICATION
	Er, Xinzhong 1; Ge, Junqiang1 ; Mao, Shude1,2
刊名	ASTROPHYSICAL JOURNAL
	2013-06-20
卷号	770 期号:2
关键词	galaxies: high-redshift gravitational lensing: strong
英文摘要	We study the lensing magnification effect on background galaxies. Differential magnification due to different magnifications of different source regions of a galaxy will change the lensed composite spectra. The derived properties of the background galaxies are therefore biased. For simplicity, we model galaxies as a superposition of an axis-symmetric bulge and a face-on disk in order to study the differential magnification effect on the composite spectra. We find that some properties derived from the spectra (e.g., velocity dispersion, star formation rate, and metallicity) are modified. Depending on the relative positions of the source and the lens, the inferred results can be either over- or underestimates of the true values. In general, for an extended source at strong lensing regions with high magnifications, the inferred physical parameters (e.g., metallicity) can be strongly biased. Therefore, detailed lens modeling is necessary to obtain the true properties of the lensed galaxies.
收录类别	SCI
语种	英语
WOS记录号	WOS:000320111200028
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5841]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England
推荐引用方式 GB/T 7714	Er, Xinzhong,Ge, Junqiang,Mao, Shude. BIASES IN PHYSICAL PARAMETER ESTIMATES THROUGH DIFFERENTIAL LENSING MAGNIFICATION[J]. ASTROPHYSICAL JOURNAL,2013,770(2).
APA	Er, Xinzhong,Ge, Junqiang,&Mao, Shude.(2013).BIASES IN PHYSICAL PARAMETER ESTIMATES THROUGH DIFFERENTIAL LENSING MAGNIFICATION.ASTROPHYSICAL JOURNAL,770(2).
MLA	Er, Xinzhong,et al."BIASES IN PHYSICAL PARAMETER ESTIMATES THROUGH DIFFERENTIAL LENSING MAGNIFICATION".ASTROPHYSICAL JOURNAL 770.2(2013).