A Panoramic 24-um/HST Survey for Obscured Activity in Clusters at z~0.5

Details A Panoramic 24-um/HST Survey for Obscured Activity in Clusters at z~0.5 A Panoramic 24-um/HST Survey for Obscured Activity in Clusters at z~0.5

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3143s&link_type=abstract

Spitzer Proposal ID #3143

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We propose to use MIPS to obtain high quality panoramic 24um mid-IR imaging of galaxies within two rich clusters at z~0.5 which are the subject of an extremely wide-field imaging with HST and massive spectroscopic coverage with ground-based telescopes. We aim to test recent claims for a previously unidentified obscured-starburst population in distant clusters. These galaxies show radio synchotron and mid-IR emission indicative of current strong star formation, but have classical ``Post-starburst'' optical spectra. The proposed mid-IR imaging will trace the photometric signatures of dust-obscured activity in morphologically- and spectrally-classified samples of galaxies from the high-density cores of the clusters out to their turn-around radii, ~5 Mpc, where they merge into the surrounding field. This will allow us to construct the evolutionary cycle for galaxies as they are accreted onto a cluster, by tracing the variation in their activity as a function of their environment parameterised in terms of their local galaxy, gas and dark matter density. Using these data we will distinguish between the environmental variations characteristic of the different proposed triggering mechanisms. The results of our analysis will provide a clearer view of the physical processes responsible for driving this behaviour as well as the prevelence of dust and obscured starbursts in distant cluster and field galaxies.

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