Two Galaxy Clusters: A3565 and A3560

Galaxy Clusters

Globular Clusters and Galaxy Formation

We first discuss recent progress in using the Milky Way globular cluster (GC) system as a ‘test-bed’ for properties derived from integrated spectra and stellar population models. Standard techniques may give rise to spuriously high alpha-element ratios at low metallicities. We then discuss evidence for early epoch (z ≥ 2) formation for most GCs in galaxies today. Recent accretions of GCs (and t...

Galaxy Activity in Merging Binary Galaxy Clusters

We present the results of a study of galaxy activity in two merging binary clusters (A168 and A1750) using the Sloan Digital Sky Survey (SDSS) data supplemented with the data in the literature. We have investigated the merger histories of A168 and A1750 by combining the results from a two-body dynamical model and X-ray data. In A168 two subclusters appear to have passed each other and to be com...

Galaxy-galaxy lensing in clusters: new results

A synopsis of the recent results from our study of galaxygalaxy lensing in clusters is presented. We have applied our analysis techniques to the sample of HST cluster-lenses that span a redshift range from z = 0.18–0.58. We find that there is evidence that the total mass of a typical early-type cluster L galaxy increases with redshift. For the lowest redshift bin, a sensible comparison can be m...

Cosmography with Galaxy Clusters

M. Soares-Santos Fermi National Accelerator Laboratory, Batavia, IL 60510, USA and Universidade de São Paulo, São Paulo, SP 05508-090, Brazil R. R. de Carvalho VST Center at Naples, Napoli, 80131, Italy and Instituto Nacional de Pesquisas Espaciais, São José dos Campos, SP 12227-010, Brazil F. La Barbera Osservatorio Astronomico di Capodimonte, Napoli, 80131, Italy P. A. A. Lopes Universidade d...