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Paper: Mass Distribution in Compact Groups
Volume: 209, Small Galaxy Groups, IAU Colloquium 174
Page: 377
Authors: Perea, J.; del Olmo, A.; Verdes-Montenegro, L.; Yun, M. S.; Huchtmeier, W. K.; Williams, B. A.
Abstract: 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.
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