Dust-Obscured Star-Formation in Intermediate Redshift Galaxy Clusters

Details Dust-Obscured Star-Formation in Intermediate Redshift Galaxy Clusters Dust-Obscured Star-Formation in Intermediate Redshift Galaxy Clusters

2010-10-25

arxiv.org/abs/1010.5164v1

ApJ, 720:87-98, 2010 Sept 1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

15 pages, 9 figures

Scientific paper

We present Spitzer MIPS 24-micron observations of 16 0.45A, and ~75% exhibit optical signatures of dusty starbursts. On average, the fraction of cluster LIRGs increases with projected cluster-centric radius but remains systematically lower than the field fraction over the area probed (< 1.5xR200). 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.

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