Compact Groups of Galaxies in the SDSS Early Data Release

Details Compact Groups of Galaxies in the SDSS Early Data Release Compact Groups of Galaxies in the SDSS Early Data Release

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19910019l&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #100.19; Bulletin of the American Astronomical Society, Vol. 33, p.1460

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Compact groups (CGs) of galaxies --- relatively poor groups of galaxies in which the typical separations between members is of the order of a galaxy diameter --- offer an exceptional laboratory for the study of dense galaxian environments with short (< 1 Gyr) dynamical timescales. We are studying methods for extracting an objectively defined catalog of CGs from the Sloan Digital Sky Survey (SDSS) Early Data Release down to a limiting galaxy magnitude of r*=21. As a first attempt, we have examined Hickson's (1982) criteria for finding CGs on over 200 deg2 of SDSS commissioning data down to a magnitude of r*=21. Modifications to the criteria were examined in order to reduce the rate of chance alignments. For the final catalog, redshifts and colors of group members are compared to a similarly selected catalog of field galaxies.

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