The interesting Mrs Abell

Dynamics of the X - ray clusters Abell 222 , Abell 223 and Abell 520 ⋆

We present the results of a dynamical analysis of three rich, X-ray luminous galaxy clusters, Abell 222, Abell 223 and Abell 520, that are at intermediate redshifts. Our study is based on radial velocities for 71 cluster members, respectively 30 for A 222, 20 for A 223 and 21 for A 520, measured from spectra obtained at the Canada-France-Hawaii Telescope, the European Southern Observatory, and ...

Abell Clusters

Photometry of Abell 2390

We present the results of a search for strong Hα emission line galaxies (rest frame equivalent widths greater than 50Å) in the z ≈ 0.23 cluster Abell 2390. The survey contains 1189 galaxies over 270 ⊓⊔′, and is 50% complete at Mr ≈ −17.5 + 5 log h. The fraction of galaxies in which Hα is detected at the 2σ level rises from 0.0 in the central regions (excluding the cD galaxy) to 12.5±8% at R200....

Spectral index maps of the radio halos in Abell 665 and Abell 2163

New radio data at 330 MHz are presented for the rich clusters Abell 665 and Abell 2163, whose radio emission is characterized by the presence of a radio halo. These images allowed us to derive the spectral properties of the two clusters under study. The integrated spectra of these halos between 0.3 GHz and 1.4 GHz are moderately steep: α1.4 0.3 = 1.04 and α1.4 0.3 = 1.18, for A665 and A2163, re...

The morphological decomposition of Abell 868 1

We report on the morphological luminosity functions (LFs) and radial profiles derived for the galaxy population within the rich cluster Abell 868 (z = 0.153) based purely on Hubble Space Telescope Imaging in F 606W. We recover Schechter functions (−24.