The number of rich galaxy clusters per unit volume is a strong function of , the cosmological density parameter, and 8 , the linear extrapolation to z = 0 of the density contrast in 8h ?1 Mpc spheres. The CNOC cluster redshift survey provides a sample of clusters whose average mass prooles are accurately known, which enables a secure association between cluster numbers and the ltered density pe...

The clustering signals of galaxy clusters are known to be powerful tools for self-calibrating the mass-observable relation and complementary cluster abundance lensing. In this work, we explore possibility combining three correlation functions -- lensing, cluster-galaxy cross-correlation function, auto-correlation function self-calibrate optical selection bias, boosted lensing in a richness-sele...

We combine semi–analytical methods with a ultra-high resolution simulation of a cluster (of mass 2.3 × 10hM⊙, and 4 × 10 6 particles within its virial radius) formed in a standard CDM universe to study the spatial distribution and orbital properties of the present–day descendents of Lyman Break galaxies (LBG). At redshift 3 we find a total of 12 halos containing at least one Lyman Break galaxy ...

We present a strong-lensing (SL) analysis of the galaxy cluster MACS J1319.9+7003 (z=0.33, also known as Abell 1722), as part of our ongoing effort to analyze massive clusters with archival Hubble Space Telescope (HST) imaging. We spectroscopically measured with Keck/Multi-Object Spectrometer For Infra-Red Exploration (MOSFIRE) two galaxies multiply imaged by the cluster. Our analysis reveals...

There exists a relationship between globular cluster mean metallicity and parent galaxy luminosity (e.g. Brodie & Huchra 1991; Forbes et al. 1996), which appears to be similar to that between stellar metallicity and galaxy luminosity. The globular cluster relation has a similar slope but is offset by about 0.5 dex to lower metallicity. The similarity of these relations suggests that both the gl...