Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· References in the article
· Citations to the Article (1) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (4)
· NED Objects (1)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Improved Models for the Evolution of the Coma Cluster of Galaxies
Authors:
Laine, Seppo; Zheng, Jia-Qing; Valtonen, Mauri J.
Affiliation:
AA(Spitzer Science Center, 220-6, California Institute of Technology, Pasadena, CA 91125; ), AB(Tuorla Observatory, University of Turku, Väisälänlie 20, FIN-21500 Piikkiö, Finland; , ), AC(Tuorla Observatory, University of Turku, Väisälänlie 20, FIN-21500 Piikkiö, Finland; , )
Publication:
The Astronomical Journal, Volume 127, Issue 2, pp. 765-770. (AJ Homepage)
Publication Date:
02/2004
Origin:
UCP
AJ Keywords:
Cosmology: Dark Matter, Galaxies: Clusters: Individual: Name: Coma, Galaxies: Interactions
DOI:
10.1086/381481
Bibliographic Code:
2004AJ....127..765L

Abstract

The analysis by Fitchett & Webster of the observations of the Coma cluster of galaxies has demonstrated that the center of the Coma Cluster consists of two subclusters. Therefore, it is important to construct realistic dynamical models of a galaxy cluster with two mass centers. Our previous N-body models for the Coma Cluster consisted of point masses or particles with simple interaction properties. In the current paper, we employ a more sophisticated N-body code, which includes dynamical friction, mass exchange, and mergers between galaxies. Our starting point is a model where the two subclusters form a binary system. The rest of the cluster galaxies are in nearly radial, bound orbits around the center of mass of the binary. The initial galaxy densities and velocities are chosen according to a particular cosmological model. At the end of the N-body simulation of 250 galaxies, we extract the projected galaxy surface density and radial velocity dispersion profiles as a function of the distance from the center of the mass of the cluster. With certain initial parameters, excellent agreement with observations is obtained. In such models, the use of the virial theorem in the standard way gives an overestimate of the cluster mass by a factor of about 3. Therefore, the true mass of the Coma Cluster should be smaller than the usually quoted value by the same factor. The mass-to-light ratio of the Coma Cluster should be about 100 in solar units, in agreement with the analysis of the X-ray data by Cowie et al.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints