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Mass Distribution in Compact Groups

Published online by Cambridge University Press:  12 April 2016

J. Perea ,
A. del Olmo ,
L. Verdes-Montenegro ,
M. S. Yun ,
W.K. Huchtmeier  and
B. A. Williams
J. Perea
Affiliation:
Instituto de Astrofísica de Andalucía(CSIC), Granada, Spain
A. del Olmo
Affiliation:
Instituto de Astrofísica de Andalucía(CSIC), Granada, Spain
L. Verdes-Montenegro
Affiliation:
Instituto de Astrofísica de Andalucía(CSIC), Granada, Spain
M. S. Yun
Affiliation:
National Radio Astronomy Observatory, 1, Socorro, NM, USA
W.K. Huchtmeier
Affiliation:
Max-Planck-Institut für Radioastronomie, Bonn, D-53121, Germany
B. A. Williams
Affiliation:
University of Delaware, Newark, Delaware, USA

Abstract

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New redshift surveys of galaxies in the field of compact groups have discovered a population of faint galaxies which act as satellites orbiting in the potential well of the bright group. Here we analyze the mass distribution of the groups by comparing the mass derived from the bright members and the mass obtained from the satellite galaxies. Our analysis indicates the presence of a dark halo around the main group with a mass roughly four times that measured for the dominant galaxies of the compact group.

We found that heavier halos are ruled out by the observations when comparing the distribution of positions and redshifts of the satellite galaxies with the distribution of satellites of isolated spiral galaxies. The results agree with a picture where compact groups may form a stable system with galaxies moving in a common dark halo.

Type
Part 5. Dark Matter and Clustering
Information
International Astronomical Union Colloquium , Volume 174: Small Galaxy Groups , 2000 , pp. 377 - 380
Copyright
Copyright © Astronomical Society of the Pacific 2000

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