The Impact of Environment on Galaxy Group Evolution in the Coma-A1367 Supercluster

Type Conference Paper
Names Kelley M. Hess, E. M. Wilcots, M. P. Haynes, R. Giovanelli, ALFALFA Team
Proceedings Title Bulletin of the American Astronomical Society
Conference Name American Astronomical Society, AAS Meeting #217, #115.03
Volume 43
Date January 1, 2011
Library Catalog NASA ADS
Abstract We present the HI content of galaxies and galaxy groups in the Coma-Abell 1367 Supercluster derived from a 180 square degree strip of the ALFALFA survey between +24d and +28d from 11h to 14h. We use this data to present a complete view of the neutral gas content in galaxy groups as a function of the large scale environment and derive a group HI mass function. The galaxy groups, derived from SDSS, span a range of global environments from the highest density sub-clumps falling into the center of the Coma cluster, to groups that make up the filament between the Coma and Abell 1367, to poor groups that exist on the edges of voids. Using the results from ALFALFA as well as widefield imaging and GALEX UV data we test the idea that the majority of galaxy evolution happens in groups prior to their in-fall into a galaxy cluster. In addition we correlate the frequency of low luminosity AGN activities with the HI properties of the environment. Together these multi-wavelength observations show how the HI content, the star formation rate and the AGN frequency change as a function of local galaxy density and distance from the cluster center and show how the role of environment affects galaxy evolution.
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