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

Details 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

2002-06-06

arxiv.org/abs/astro-ph/0206098v2

Mon.Not.Roy.Astron.Soc. 335 (2002) L89

Astronomy and Astrophysics

Astrophysics

5 pages with 3 figures; minor revisions, accepted for publication in MNRAS (Letters)

Scientific paper

10.1046/j.1365-8711.2002.05899.x

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 halos. With the simulations of different resolutions, we find that the ellipticity correlations converge once the halos have more than 160 members. For halos with fewer members, the correlations are underestimated, and the underestimation amounts to a factor of 2 when the halos have only 20 particles. After correcting for the resolution effects, we show that the ellipticity correlations of halos in the bigger box (L=300 mpc) agree very well with those obtained in the smaller box (L=100 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.

Affiliated with

Also associated with

No associations

Rating

Intrinsic correlation of halo ellipticity and its implications for large-scale weak lensing surveys does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Intrinsic correlation of halo ellipticity and its implications for large-scale weak lensing surveys, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intrinsic correlation of halo ellipticity and its implications for large-scale weak lensing surveys will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-436285