| Description |
We propose deep five-band imaging with SPIRE and PACS of 10 of the most massive galaxy clusters in a 455 square degree southern strip surveyed by the Atacama Cosmology Telescope (ACT). Our targets lie at 0.3 < z < 1.1 and were identified by their 2mm Sunyaev-Zel.dovich Effect (SZE) decrements, which provide a redshift-independent mass selection, and confirmed with optical imaging. Herschel observations, building on X-ray, optical, near-IR, submillimeter, and radio data, will allow us to study how star formation within individual galaxy members and integrated across clusters is influenced by the process of cluster assembly in the most massive systems out to z virgul 1. We will also extract our targets. SZE decrement/increment spectra and mass profiles, providing useful inputs to the cross-calibration and interpretation of large SZE surveys. Finally, our observations will exploit the clusters. gravitational lensing for the detection of dusty background galaxies, down to flux levels that would otherwise be below the confusion limit of blank-field imaging. By combining PACS and SPIRE data with our ancillary observations, we will be able to determine photometric redshifts for these background galaxies sufficiently well to allow followup observations with ALMA, for which our fields. southern declinations are ideal, in order to understand the detailed physical properties of dusty star-forming galaxies at high redshift. |
