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Spitzer/MIPS 24 μm observations of galaxy clusters: an increasing fraction of obscured star-forming members from z = 0.02 to z = 0.83


Saintonge, A; Tran, K V H; Holden, B P (2008). Spitzer/MIPS 24 μm observations of galaxy clusters: an increasing fraction of obscured star-forming members from z = 0.02 to z = 0.83. Astrophysical Journal Letters, 685(2):L113-L116.

Abstract

We study the mid-infrared properties of 1315 spectroscopically confirmed members in eight massive (Mvirgtrsim 5 × 1014 Msun) galaxy clusters covering the redshift range from 0.02 to 0.83. The selected clusters all have deep Spitzer/MIPS 24 μm 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 Msun yr−1 from 3% at z = 0.02 to 13% at z = 0.83 (RP ≤ 1 Mpc). This increase is reproduced even when considering only the most massive members (M* ≥ 4 × 1010 Msun). The 24 μm 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 [Δ (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.

We study the mid-infrared properties of 1315 spectroscopically confirmed members in eight massive (Mvirgtrsim 5 × 1014 Msun) galaxy clusters covering the redshift range from 0.02 to 0.83. The selected clusters all have deep Spitzer/MIPS 24 μm 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 Msun yr−1 from 3% at z = 0.02 to 13% at z = 0.83 (RP ≤ 1 Mpc). This increase is reproduced even when considering only the most massive members (M* ≥ 4 × 1010 Msun). The 24 μm 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 [Δ (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.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:October 2008
Deposited On:06 Mar 2009 10:26
Last Modified:05 Apr 2016 13:06
Publisher:Institute of Physics Publishing
ISSN:2041-8205
Publisher DOI:10.1086/592730
Related URLs:http://arxiv.org/abs/0806.2157
Permanent URL: http://doi.org/10.5167/uzh-16565

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