Understanding the shape of the galaxy two-point correlation function at z~1 in the COSMOS field

Details Understanding the shape of the galaxy two-point correlation function at z~1 in the COSMOS field Understanding the shape of the galaxy two-point correlation function at z~1 in the COSMOS field

2010-07-12

arxiv.org/abs/1007.1984v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 3 figures, accepted for publication in MNRAS

Scientific paper

We investigate how the shape of the galaxy two-point correlation function as measured in the zCOSMOS survey depends on local environment, quantified in terms of the density contrast on scales of 5 Mpc/h. We show that the flat shape previously observed at redshifts between z=0.6 and z=1 can be explained by this volume being simply 10% over-abundant in high-density environments, with respect to a Universal density probability distribution function. When galaxies corresponding to the top 10% tail of the distribution are excluded, the measured w_p(r_p) steepens and becomes indistinguishable from LCDM predictions on all scales. This is the same effect recognised by Abbas & Sheth in the SDSS data at z~0 and explained as a natural consequence of halo-environment correlations in a hierarchical scenario. Galaxies living in high-density regions trace dark matter halos with typically higher masses, which are more correlated. If the density probability distribution function of the sample is particularly rich in high-density regions because of the variance introduced by its finite size, this produces a distorted two-point correlation function. We argue that this is the dominant effect responsible for the observed "peculiar" clustering in the COSMOS field.

Affiliated with

Also associated with

No associations

Rating

Understanding the shape of the galaxy two-point correlation function at z~1 in the COSMOS field 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 Understanding the shape of the galaxy two-point correlation function at z~1 in the COSMOS field, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Understanding the shape of the galaxy two-point correlation function at z~1 in the COSMOS field will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-350010