A WISE View of Star Formation in Local Galaxy Clusters
We present results from a systematic study of star formation in local galaxy clusters using 22 μm data from the Wide-field Infrared Survey Explorer (WISE). The 69 systems in our sample are drawn from the Cluster Infall Regions Survey, and all have robust mass determinations. The all-sky WISE data enable us to quantify the amount of star formation, as traced by 22 μm, as a function of radius well beyond R_(200), and investigate the dependence of total star formation rate upon cluster mass. We find that the fraction of star-forming galaxies increases with cluster radius but remains below the field value even at 3R_(200). We also find that there is no strong correlation between the mass-normalized total specific star formation rate and cluster mass, indicating that the mass of the host cluster does not strongly influence the total star formation rate of cluster members.
Additional Information© 2011 The American Astronomical Society. Received 2011 April 12; accepted 2011 August 22; published 2011 November 21. This publication makes use of data products from the Widefield Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. The authors thank Emilio Donoso for his help and advice on navigating the SDSS database. We also thank the anonymous referee for a careful reading and comments which improved the paper.
Published - Chung2011p16913Astrophys_J.pdf