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The Galaxy Populations of X-Ray Detected, Poor Groups

By Kim-vy H. Tran, Luc Simard, Ann I. Zabludoff and John S. Mulchaey

Abstract

We determine the quantitative morphology and star formation properties of galaxies in six nearby X-ray detected, poor groups using multi-object spectroscopy and wide-field R imaging. The mean recessional velocities of the galaxy groups range from 2843 to 7558 km s −1. Each group has 15 to 38 confirmed members ranging in luminosity from dwarfs to giants (−13.7 ≥ MR − 5logh ≥ −21.9). We measure structural parameters for each galaxy by fitting a PSF-convolved, two component model to their surface brightness profiles. To compare directly the samples, we fade, smooth, and rebin each galaxy image so that we effectively observe each galaxy at the same redshift (9000 km s −1) and physical resolution (0.87h −1 kpc). The structural parameters are combined with [OII] measurements to test for correlations between morphological characteristics and current star formation in these galaxies. We compare results for the groups to a sample 1 Department of Astronomy and Steward Observatory, University of Arizona, Tucson, AZ 85721 – 2 of field galaxies. We find that: 1) Galaxies spanning a wide range in morphological typ

Year: 2000
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