Surface Brightness Profiles and Fine Structure of Isolated Elliptical Galaxies

Details Surface Brightness Profiles and Fine Structure of Isolated Elliptical Galaxies Surface Brightness Profiles and Fine Structure of Isolated Elliptical Galaxies

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..tsf.ab003a&link_type=abstract

American Physical Society, Texas Section Fall Meeting, October 4-6, 2001 Fort Worth, Texas Meeting ID: TSF01, abstract #AB.003

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Elliptical galaxies are thought to be the result of merger processes and are found predominantly in high-density regions of the universe. Because galaxy collisions are commonplace in the dense environment of clusters, distinguishing which characteristics of elliptical morphology in cluster members are caused by environment vs initial conditions is difficult, as is establishing the timescales over which merger-induced fine structure persists. These limitations make isolated elliptical galaxies particularly valuable for answering the above questions. In our study, we have defined isolated elliptical galaxies as separated by at least 2.5 Mpc from any other galaxy with MV < -16.5. This separation precludes interaction with galaxies of similar luminosity known to be in the isolated elliptical’s environment over a Hubble time. We have verified this level of isolation for 6 elliptical galaxies in the northern hemisphere of the sky. We have performed isophotal analysis and unsharp masking on these objects to search for the presence of fine structure. We compare our results to those published for elliptical galaxies in more clustered environments.

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