A New Look at Poor Groups of Galaxies

Details A New Look at Poor Groups of Galaxies A New Look at Poor Groups of Galaxies

1999-04-23

arxiv.org/abs/astro-ph/9904332v1

Astronomy and Astrophysics

Astrophysics

7 pages, no figures, LaTeX, uses paspconf.sty. To appear in proceedings of IAU Symp. 192, "The Stellar Content of Local Group

Scientific paper

We use a new fiber spectroscopic survey of 12 nearby, poor groups of galaxies to examine the dynamics and evolution of galaxies in these common, but poorly studied, environments. Some of our conclusions are: (1) The nine groups in our sample with diffuse X-ray emission are in fact bound systems with at least 20-50 group members with absolute magnitudes as faint as M_B ~ -14 + 5 log h. (2) Galaxies in each X-ray-detected group have not all merged together because a significant fraction of the group mass lies outside of the galaxies and in a common halo, thereby reducing the rate of galaxy-galaxy interactions. (3) The similarity of the recent star formation histories and the fraction of early type galaxies in some poor groups to those in rich clusters suggests that cluster-specific environmental effects may not play a dominant role in the recent evolution of cluster galaxies. The evolution of group and cluster members may be driven instead by galaxy-galaxy interactions, which are likely to occur with equal frequency in field groups and in groups that have recently fallen into clusters (i.e., subclusters).

Affiliated with

Also associated with

No associations

Rating

A New Look at Poor Groups of Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A New Look at Poor Groups of Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A New Look at Poor Groups of Galaxies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-626774