Small groups of Galaxies as Cosmological Clocks

Details Small groups of Galaxies as Cosmological Clocks Small groups of Galaxies as Cosmological Clocks

1996-10-29

arxiv.org/abs/astro-ph/9610231v1

Astronomy and Astrophysics

Astrophysics

7 pages, 5 postscript figures included. To appear in "Dark and Visible Matter in Galaxies and Cosmological Implications", eds

Scientific paper

We study the formation and evolution of small groups of galaxies using new Monte Carlo simulations. These are directly based on the random walk approach to the statistics of condensations collapsing by gravitational instability, and the results are consistent with the Press and Schechter formula. We stress how observational features of groups, such as galaxy membership, depend on the global dynamics of the Universe. This is because the amount of aggregations between infalling galaxies is governed by the ratio of the group age to the time scale for dynamical friction. This ratio strongly depends on cosmology. Thus in low-density models, even if flat, collapse of group sized perturbations followed by fast mergers, would often originate a single massive remnant. This is contrast to observed associations as compact groups of galaxies.

Affiliated with

Also associated with

No associations

Rating

Small groups of Galaxies as Cosmological Clocks 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 Small groups of Galaxies as Cosmological Clocks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Small groups of Galaxies as Cosmological Clocks will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-575304