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Date and Time of the Query: 2019-04-19 T06:02:48 PDT
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For refcode 2008MNRAS.389..749M:
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Copyright by Royal Astronomical Society. 2008MNRAS.389..749M The anatomy of the NGC5044 group - I. Group membership and dynamics Mendel, J. Trevor; Proctor, Robert N.; Forbes, Duncan A.; Brough, Sarah Abstract. We use a combination of new AA{OMEGA} multi-object wide-field spectroscopic observations and literature data to define 111 spectroscopically confirmed members of the massive NGC5044 group with M_B_ <= -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 9.2 x 10^13^M_sun_, placing it on the border between rich groups and poor clusters. However, comparison to the L_X_-{sigma}_nu_ and L_X_-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. Key words: galaxies: clusters: NGC5044 group, galaxies: distances and redshifts, galaxies: evolution, galaxies: formation, galaxies: fundamental parameters
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