The Resolved Sunyaev–Zel’dovich Profiles of Nearby Galaxy Groups

The Dwarf Galaxy Population in Nearby Groups. the Data

We used V and I CCD photometry to search for low-surface brightness dwarf galaxies in the central (< 0.5 h Mpc) region of the loose groups NGC 6868 (Telescopium) and NGC 5846, the compact group HCG 42 and the poor cluster IC 4765. We used the parameters given by the exponential profile fit (central surface brightness, scale length and limiting diameter) to identify 80 low surfacebrightness dwar...

The Nearby Field Galaxy

Testing of the dwarf galaxy content and the evolutionary status of nearby groups of galaxies

We carried out visual and parametric searches for dwarf galaxies in five loose groups of galaxies. Follow-up spectroscopy with the HET has shown a 50% success rate of morphological selection. The evolutionary status of the studied groups differs: while the NGC 6962 group has a partially relaxed core, surrounded by an infall region, the NGC 5005/5033 group and the IC 65 group, which consist only...

A Redshift Survey of Nearby Galaxy Groups: the Shape of the Mass Density Profile

We constrain the mass profile and orbital structure of nearby groups and clusters of galaxies. Our method yields the joint probability distribution of the density slope n, the velocity anisotropy β, and the turnover radius r0 for these systems. The measurement technique does not use results from N-body simulations as priors. We incorporate 2419 new redshifts (included here) in the fields of 41 ...

The ESO nearby Abell cluster survey VII. Galaxy density profiles of rich clusters of galaxies

We have analyzed the projected galaxy distributions in a subset of the ENACS cluster sample, viz. in those 77 clusters that have z < 0.1 and RACO ≥ 1 and for which ENACS and COSMOS data are available. For 20 % of these, the distribution of galaxies in the COSMOS catalogue does not allow a reliable centre position to be determined. For the other 62 clusters, we first determined the centre and el...