The Dwarf Galaxy Population in Nearby Groups: The Data

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...

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...

The dwarf galaxy population in Abell 2218

We present results from a deep photometric study of the rich galaxy cluster Abell 2218 (z = 0.18) based on archival HST WFPC2 F606W images. These have been used to derive the luminosity function to extremely faint limits (MF606W ≈ −13.2 mag, μ0 ≈ 24.7mag arcsec ) over a wide field of view (1.3 h Mpc). We find the faint-end slope of the luminosity function to vary with environment within the clu...

Holes and Shells in the Interstellar Medium of the Nearby Dwarf Galaxy IC 2574

We present H I synthesis observation of the nearby dwarf galaxy IC 2574 (a member of the M81 group of galaxies) made with the NRAO Very Large Array in its B–, C– and D–array configurations at high spatial and velocity resolution (95 pc × 2.6 km s−1). In addition, we present optical broad and narrow band images obtained with the 2.2– m telescope of the Calar Alto observatory. The VLA H I observa...

The Nearby Field Galaxy