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Date and Time of the Query: 2019-07-19 T16:09:42 PDT
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For refcode 2008ApJ...685L.113S:
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2008ApJ...685L.113S Spitzer/MIPS 24 micron Observations of Galaxy Clusters: An Increasing Fraction of Obscured Star-forming Members from z = 0.02 to z = 0.83 Saintonge, Amelie; Tran, Kim-Vy H.; Holden, Bradford P. Abstract. We study the mid-infrared properties of 1315 spectroscopically confirmed members in eight massive (M_vir_>~5x10^14^ M_sun_) galaxy clusters covering the redshift range from 0.02 to 0.83. The selected clusters all have deep Spitzer/MIPS 24 micron observations, Hubble and ground-based photometry, and extensive redshift catalogs. We observe for the first time an increase in the fraction of cluster galaxies with mid-infrared star formation rates higher than 5 M_sun_ yr^-1^ from 3% at z=0.02 to 13% at z=0.83 (R_P_<=1 Mpc). This increase is reproduced even when considering only the most massive members (M_*_>=4x10^10^ M_sun_). The 24 micron observations reveal stronger evolution in the fraction of blue/star-forming cluster galaxies than in color-selected samples: the number of dusty, strongly star-forming cluster galaxies increases with redshift, and combining these with the optically defined Butcher-Oemler members [{DELTA}(B-V)<-0.2] doubles the total fraction of blue/star-forming galaxies in the inner Mpc of the clusters to ~23% at z=0.83. These results, the first of our Spitzer/MIPS Infra-Red Cluster Survey (SMIRCS), support earlier studies indicating that the increase in star-forming members is driven by cluster assembly and galaxy infall, as is expected in the framework of hierarchical formation. Key words: Galaxies: Clusters: General, Galaxies: Evolution, Galaxies: Fundamental Parameters
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