Intrinsic correlation of halo ellipticity and its implications for large-scale weak lensing surveys

	Intrinsic correlation of halo ellipticity and its implications for large-scale weak lensing surveys
	Jing, YP
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2002-10-01
卷号	335 期号:4 页码:L89-L93
关键词	gravitational lensing cosmology : observations cosmology : theory dark matter large-scale structure of Universe
英文摘要	We use a large set of state-of-the-art cosmological N-body simulations [512(3) particles] to study the intrinsic ellipticity correlation functions of haloes. With the simulations of different resolutions, we find that the ellipticity correlations converge once the haloes have more than 160 members. For haloes with fewer members, the correlations are underestimated, and the underestimation amounts to a factor of 2 when the haloes have only 20 particles. After correcting for the resolution effects, we show that the ellipticity correlations of haloes in the bigger box L = 300 h(-1) Mpc) agree very well with those obtained in the smaller box (L = 100 h(-1) Mpc). Combining these results from the different simulation boxes, we present accurate fitting formulae for the ellipticity correlation function c(11)(r) and for the projected correlation functions Sigma(11)(r(p)) and Sigma(22) (r(p)) over three orders of magnitude in halo mass. The latter two functions are useful for predicting the contribution of the intrinsic correlations to deep lensing surveys. With reasonable assumptions for the redshift distribution of galaxies and for the mass of galaxies, we find that the intrinsic ellipticity correlation can contribute significantly not only to shallow surveys but also to deep surveys. Our results indicate that previous similar studies significantly underestimated this contribution for their limited simulation resolutions.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	GALAXY ELLIPTICITIES ; COSMIC SHEAR ; DARK-MATTER ; DISTANT GALAXIES ; ALIGNMENTS ; STATISTICS ; IMAGES ; FIELDS
收录类别	SCI
语种	英语
WOS记录号	WOS:000178284000003
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/28310]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Max Planck Inst Astrophys, Partner Grp, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Peking Univ, Beijing Astrophys Ctr, Beijing 100871, Peoples R China 3.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Jing, YP. Intrinsic correlation of halo ellipticity and its implications for large-scale weak lensing surveys[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2002,335(4):L89-L93.
APA	Jing, YP.(2002).Intrinsic correlation of halo ellipticity and its implications for large-scale weak lensing surveys.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,335(4),L89-L93.
MLA	Jing, YP."Intrinsic correlation of halo ellipticity and its implications for large-scale weak lensing surveys".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 335.4(2002):L89-L93.