Obscured activity and environment: a 24um survey of two well-studied clusters at z~0.5

Details Obscured activity and environment: a 24um survey of two well-studied clusters at z~0.5 Obscured activity and environment: a 24um survey of two well-studied clusters at z~0.5

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30263s&link_type=abstract

Spitzer Proposal ID #30263

Physics

Scientific paper

We propose to use MIPS to obtain high quality panoramic 24um mid-infrared imaging of galaxies within two rich clusters at z~0.5 which are part of an panoramic photometric survey using Subaru. Our survey traces the galaxy properties within the large scale structure around these massive clusters. In the outer regions of galaxy clusters critical processes take place which transform the properties of in-falling, star-forming spiral field galaxies and convert these to the passive, early-type galaxies which dominate the cluster population. In our optical survey of rich clusters at z=0.4-0.5 we have discovered a sharp dependence with local galaxy density in the apparent star formation activity within galaxies. This critical density threshold is characteristic of groups and filaments. We now propose to extend ourinvestigation of this behaviour using sensitive mid-infrared observations to trace the variation of obscured activity within the large-scale structure around these clusters. 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. The results of our analysis will provide a clearer view of the physical processes responsible for creating the strong environmental variations in galaxy properties which underpin the local morphology-density relation.

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