Extremely Isolated Early-Type Galaxies

Details Extremely Isolated Early-Type Galaxies Extremely Isolated Early-Type Galaxies

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aps..tsfap1008f&link_type=abstract

American Physical Society, Texas Section of the APS Joint Fall Meeting, October 5-7, 2006, abstract #AP1.008

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Scientific paper

Isolated galaxies provide a unique means of assessing the evolution of galactic systems. Extremely isolated galaxies define the zero-interaction baseline for comparative studies of galaxy evolution. Here we present results for a sample of isolated early-type galaxies (IEGs) in the local universe. Candidate IEGs were identified using the optical imaging data from Release 1-5 of the Sloan Digital Sky Survey (SDSS). Objects are selected according to strict isolation criteria: IEGs must be separated by at least 2.5 Mpc from any neighboring non-dwarf companion galaxy (MV> -16.5 mag). These criteria insure that the IEGs have never interacted with another existing galaxy since formation. We have combined SDSS images in the u,g,r filters to improve the signal-to-noise ratio. The stacked images permit a more robust determination of the morphology and photometric structure of the candidate galaxies. The images are interpreted using annular surface photometry and a bulge/disk decomposition technique. Our sample defines a complete volume-limited population of extremely isolated early-type galaxies within a distance of 72Mpc.

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