Clusters of galaxies in the local universe

Details Clusters of galaxies in the local universe Clusters of galaxies in the local universe

2002-08-07

arxiv.org/abs/astro-ph/0208168v1

Astrophys.J.585:161-181,2003

Astronomy and Astrophysics

Astrophysics

22 pages, 15 figures

Scientific paper

10.1086/345896

We use a matched filter algorithm to find and study clusters in both N-body simulations artificially populated with galaxies and the 2MASS survey. In addition to numerous checks of the matched filter algorithm, we present results on the halo multiplicity function and the cluster number function. For a subset of our identified clusters we have information on X-ray temperatures and luminosities which we cross-correlate with optical richness and galaxy velocity dispersions. With all quantities normalized by the spherical radius corresponding to a mass overdensity of Delta_M=200 or the equivalent galaxy number overdensity of Delta_N=200Omega^{-1}~666, we find that the number of L>L_* galaxies in a cluster of mass M_{200} is log N_{*666} = (1.44 +/- 0.17)+(1.10 +/- 0.09)log(M_{200}h/10^{15}Msun) where the uncertainties are dominated by the scatter created by three choices for relating the observed quantities to the cluster mass. The region inside the virial radius has a K-band cluster mass-to-light ratio of (M/L)_K=(116 +/- 46)h which is essentially independent of cluster mass. Integrating over all clusters more massive than M_{200}=10^{14}Msun/h, the virialized regions of clusters contain ~7% of the local stellar luminosity, quite comparable to the mass fraction in such objects in currently popular LambdaCDM models.

Affiliated with

Also associated with

No associations

Rating

Clusters of galaxies in the local universe 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 Clusters of galaxies in the local universe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Clusters of galaxies in the local universe will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-698694