Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-06-19
Astronomy and Astrophysics
Astrophysics
18 pages, 17 figures, accepted by MNRAS. Updated to match proof version
Scientific paper
10.1111/j.1365-2966.2008.13514.x
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 NGC 5044 group with M_B <= -13.5 mag, 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 solar masses, placing it on the border between rich groups and poor clusters. However, comparison to the L_x-sigma and L_x-mass relations shows it more closely follows 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 NGC 5044 group via major sub-group mergers within the last ~1 Gyr. While the majority of dynamical indicators for the group suggest it is virialised, we find evidence for a small, dynamically distinct sub-group at 1.4 Mpc from the group centre, suggesting that the NGC 5044 group is the dominant structure in its local environment, and is currently accreting smaller groups.
Brough Sarah
Forbes Duncan A.
Mendel Trevor J.
Proctor Robert N.
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