Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21823801b&link_type=abstract
American Astronomical Society, AAS Meeting #218, #238.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The origin of isolated elliptical and fossil group galaxies is a frequently debated and investigated subject related to galaxy evolution. We propose that both X-ray gas and point sources can be used to study the evolution of such systems. Previous research by Fuse et al. (2011) demonstrates that a combination of X-ray gas and point sources is a reasonable indicator of the evolutionary state of a Hickson compact group (HCG). It has been postulated that the members of a compact group will interact and merge resulting in an isolated elliptical galaxy (Vikhlinin et al. 1999). Supporting this hypothesis are numerical simulations of coalescing HCGs, resulting in isolated ellipticals (Barnes 1997). Ponman et al. (1996) have theorized that a fully coalesced compact group will form a fossil group. Additionally, Ponman et al. suggest that the differentiating factor between fossil groups and isolated ellipticals is the dwarf companion gravitationally bound to a fossil group. A recent work by Fuse & Broming refutes the compact group - fossil group evolutionary connection, noting that the X-ray luminosities of isolated elliptical are more commensurate with the range of X-ray luminosities of HCGs, while fossil groups are at least an order of magnitude larger. A tight correlation in X-ray properties is noted between poor clusters and fossil groups (Fuse & Broming in prep). The implication is that isolated elliptical galaxies are likely the merger remnants of compact groups and fossil groups share an evolutionary connection to poor clusters. Further research will examine the connection between fossil groups and poor clusters.
Broming Emma J.
Fuse Chris
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