Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21731205k&link_type=abstract
American Astronomical Society, AAS Meeting #217, #312.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
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 Hickson (1982; Hickson compact groups, or HCGs) share the distinctive characteristics of low membership, isolation and high density. They exhibit low velocity dispersions, which which lead to prolonged 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 HCGs in the context of galaxy evolution in general. For example, in HCG 7 we observed the strengthening of interactions due to the complexity of the tidal field, in a system that is likely headed toward a dry merger. In the low mass grouping of HCG 31 we recorded morphological transformation reminiscent
of the intermediate redshift universe, with multiple simultaneous
interactions leading to the build-up of a gaseous intra-group medium. These results, along with many more, allow us to examine the overall themes that arise from the study of the aforementioned dozen: the usage of gas; the possibility of rapid morphological transformation of compact group galaxies; and the role of groups as the tail end of the galaxy clustering N-distribution.
HCG Collaboration
Konstantopoulos Iraklis
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