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2008MNRAS.389..749M - Mon. Not. R. Astron. Soc., 389, 749-765 (2008/September-2)

The anatomy of the NGC5044 group - I. Group membership and dynamics.


Abstract (from CDS):

We use a combination of new AAOmega multi-object wide-field spectroscopic observations and literature data to define 111 spectroscopically confirmed members of the massive NGC5044 group with MB≤ -13.5mag, providing a three-fold increase in group members over previous analyses of this group. We find the group to have a dynamical mass of 9.2x1013M, placing it on the border between rich groups and poor clusters. However, comparison to the LXν and LX-Mass relations shows that it more closely follows the cluster scaling relations. Using a combination of crossing time, X-ray contours and line-of-sight velocity profile, we are able to preclude growth of the NGC5044 group via major subgroup mergers within the last ∼1Gyr. While the majority of dynamical indicators for the group suggest it is virialized, we find evidence for a small, dynamically distinct subgroup at 1.4Mpc from the group centre, suggesting that the NGC5044 group is the dominant structure in its local environment, and is currently accreting smaller groups.

Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): galaxies: clusters: NGC5044 group - galaxies: distances and redshifts - galaxies: evolution - galaxies: formation - galaxies: fundamental parameters

Simbad objects: 148

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