Oral Presentation Astronomical Society of Australia Annual Scientific Meeting including HWWS 2013

The Evolution of Galaxies in Compact Groups.  (#7)

Iraklis Konstantopoulos 1
  1. Australian Astronomical Observatory, North Ryde, NSW, Australia

Galaxies are seldom found in isolation. As a small unit of large clusters, individual members are subject to the volition of their groupings and evolve most commonly through interactions and mergers. In the parameter-space between too many friends and none at all lie compact galaxy groups. The ones classified by Hickson1  (Hickson compact groups, or HCGs) share the distinctive characteristics of low membership, isolation and high density. They exhibit low velocity dispersions, which result in prolonging interactions, when such events occur, or quasi-secular evolution, when they do not. They are also HI-deficient, to a very intriguing extent. I will be discussing multi-wavelength observations of a sample of 12 HCGs2 3  and explore several themes, including the usage of gas, the dwarf galaxy membership, and the apparent rapid morphological transformation of compact group galaxies. 

  1. Hickson, 1982, ApJ, 255, 382
  2. Konstantopoulos et al., 2012, ApJ, 745, 30
  3. Konstantopoulos et al., 2010, ApJ, 723, 197