| Description |
We propose a definitive census of obscured star formation in intermediate redshift clusters and its relationship with the recent mass assembly and thermodynamic histories of the clusters. Specifically, we propose to use Herschel/PACS observations at 100 and 160um in conjunction with our Spitzer 24um data to characterize the dust-obscured galaxy populations (star formation rate, AGN contamination, bolometric IR luminosity, dust temperature) in a large unbiased sample of galaxy clusters at 0.15<z<0.3. The sample of 32 clusters is drawn from the Local Cluster Substructure Survey (LoCuSS) for which outstanding supporting data are available, including gravitational lensing, X-ray spectro-imaging, and Spitzer 24um maps. This unprecedented dataset on a large and unbiased cluster sample will enable us to answer definitively the question: what physical process(es) are responsible for triggering obscured star-formation in cluster galaxies?. The enduring legacy will be a baseline study of the demographics of low-intermediate redshift clusters against which to compare and thus interpret the rapidly growing menagerie of high redshift cluster observations. This will be achieved through a series of public data releases, that will include quantities derived from the Herschel data (e.g. L_IR, T_dust) and from our huge investment in supporting data (e.g. dark matter density, galaxy redshifts, galaxy morphologies). All of this can be achieved with a modest Key Programme of 145 hours duration. |
| Publication |
LoCuSS: Probing galaxy transformation physics with Herschel . Smith G. P. et al. . Astronomy and Astrophysics, Volume 518, id.L18, 5 pp. . 518 . 10.1051\/0004-6361\/201014691 . 2010A&A...518L..18S ,
A Herschel Study of 24 μμm-Selected AGNs and Their Host Galaxies . Xu Lei et al. . The Astrophysical Journal Supplement Series, Volume 219, Issue 2, article id. 18, 36 pp. (2015). . 219 . 10.1088\/0067-0049\/219\/2\/18 . 2015ApJS..219...18X ,
LoCuSS: The Steady Decline and Slow Quenching of Star Formation in Cluster Galaxies over the Last Four Billion Years . Haines C. P. et al. . The Astrophysical Journal, Volume 775, Issue 2, article id. 126, 23 pp. (2013). . 775 . 10.1088\/0004-637X\/775\/2\/126 . 2013ApJ...775..126H ,
The role of massive halos in the star formation history of the Universe . Popesso P. et al. . Astronomy & Astrophysics, Volume 579, id.A132, 17 pp. . 579 . 10.1051\/0004-6361\/201424715 . 2015A&A...579A.132P ,
The Relation between Luminous AGNs and Star Formation in Their Host Galaxies . Xu Lei et al. . The Astrophysical Journal, Volume 808, Issue 2, article id. 159, 10 pp. (2015). . 808 . 10.1088\/0004-637X\/808\/2\/159 . 2015ApJ...808..159X ,
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