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Dust-obscured Star Formation in Intermediate Redshift Galaxy Clusters

Finn, Rose A. and Desai, Vandana and Rudnick, Gregory and Poggianti, Bianca and Bell, Eric F. and Hinz, Joannah and Jablonka, Pascale and Milvang-Jensen, Bo and Moustakas, John and Rines, Kenneth and Zaritsky, Dennis (2010) Dust-obscured Star Formation in Intermediate Redshift Galaxy Clusters. Astrophysical Journal, 720 (1). pp. 87-98. ISSN 0004-637X.

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We present Spitzer MIPS 24 μm observations of sixteen 0.4 < z < 0.8 galaxy clusters drawn from the ESO Distant Cluster Survey. This is the first large 24 μm survey of clusters at intermediate redshift. The depth of our imaging corresponds to a total IR luminosity of 8 × 10^(10) L_⊙ , just below the luminosity of luminous infrared galaxies (LIRGs), and 6^(+1)_(–1)% of M_V < –19 cluster members show 24 μm emission at or above this level. We compare with a large sample of coeval field galaxies and find that while the fraction of cluster LIRGs lies significantly below that of the field, the IR luminosities of the field and cluster galaxies are consistent. However, the stellar masses of the EDisCS LIRGs are systematically higher than those of the field LIRGs. A comparison with optical data reveals that ~80% of cluster LIRGs are blue and the remaining 20% lie on the red sequence. Of LIRGs with optical spectra, 88^(+4)_(–5)% show [O II] emission with EW([O II]) > 5 Å, and ~75% exhibit optical signatures of dusty starbursts. On average, the fraction of cluster LIRGs increases with projected clustercentric radius but remains systematically lower than the field fraction over the area probed (<1.5× R _(200)). The amount of obscured star formation declines significantly over the 2.4 Gyr interval spanned by the EDisCS sample, and the rate of decline is the same for the cluster and field populations. Our results are consistent with an exponentially declining LIRG fraction, with the decline in the field delayed by ~1 Gyr relative to the clusters.

Item Type:Article
Related URLs:
URLURL TypeDescription
Finn, Rose A.0000-0001-8518-4862
Desai, Vandana0000-0002-1340-0543
Rudnick, Gregory0000-0001-5851-1856
Poggianti, Bianca0000-0001-8751-8360
Milvang-Jensen, Bo0000-0002-2281-2785
Zaritsky, Dennis0000-0002-5177-727X
Additional Information:© 2010 The American Astronomical Society. Received 2009 November 20; accepted 2010 July 5; published 2010 August 5. R.A.F. thanks L. Bai for useful discussions and for aiding with the comparison to her work. B.M.P. acknowledges financial support from ASI contract I/016/07/0. We thank the anonymous referee for suggestions that significantly improved the paper. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech. The Dark Cosmology Centre is funded by the Danish National Research Foundation.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Agenzia Spaziale Italiana (ASI)I/016/07/0
Subject Keywords:galaxies: clusters: general; galaxies: evolution
Issue or Number:1
Classification Code:PACS: 98.65.Cw; 98.54.Ep; 98.62.Qz; 98.62.Ai; 98.62.Py; 98.58.Ca
Record Number:CaltechAUTHORS:20100928-143207991
Persistent URL:
Official Citation:Rose A. Finn et al 2010 ApJ 720 87 doi: 10.1088/0004-637X/720/1/87
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20204
Deposited By: Ruth Sustaita
Deposited On:29 Sep 2010 22:01
Last Modified:28 Oct 2019 20:24

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