Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2012-02-14
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
8 pages, 7 figures. Accepted to MNRAS
Scientific paper
Using N-body simulations and galaxy formation models, we study the galaxy stellar mass correlation and the two-point auto-correlation. The simulations are run with cosmological parameters from the WMAP first, third and seven year results, which mainly differ in the perturbation amplitude of \sigma_{8}. The stellar mass of galaxies are determined using either a semi-analytical galaxy formation model or a simple empirical abundance matching method. Compared to the SDSS DR7 data at z=0 and the DEEP2 results at z=1, we find that the predicted galaxy clusterings from the semi-analytical model are higher than the data at small scales, regardless of the adopted cosmology. Conversely, the abundance matching method predicts good agreement with the data at both z=0 and z=1 for high \sigma_8 cosmologies (WMAP1 & WMAP7), but the predictions from a low \sigma_8 cosmology (WMAP3) are significantly lower than the data at z=0. We find that the excess clustering at small-scales in the semi-analytical model mainly arises from satellites in massive haloes, indicating that either the star formation is too efficient in low-mass haloes or tidal stripping is too inefficient at high redshift. Our results show that galaxy clustering is strongly affected by the models for galaxy formation, thus can be used to constrain the baryonic physics. The weak dependence of galaxy clustering on cosmological parameters makes it difficult to constrain the WMAP1 and WMAP7 cosmologies.
Elahi Pascal J.
Kang Xi
Li Maohua
Lin Wei-Peng
No associations
LandOfFree
Exploring Galaxy Formation Models and Cosmologies with Galaxy Clustering 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 Exploring Galaxy Formation Models and Cosmologies with Galaxy Clustering, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exploring Galaxy Formation Models and Cosmologies with Galaxy Clustering will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-555864