Computer Science
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12220m&link_type=abstract
HST Proposal ID #12220. Cycle 18
Computer Science
Scientific paper
Numerous studies of the cores of galaxy clusters have revealed that the gas in central regions is not cooling at the rates predicted by the traditional cooling flow model. This discrepancy has inspired a search for heating models that can explain current observations. AGN feedback is considered an attractive solution to several connected problems, such as the high-mass end truncation of galaxy distribution and the absence of cooling-flows in centers of galaxy clusters. Amidst the emerging hypothesis of self-regulated AGN feedback, infrared, optical and FUV observations of clusters also indicate the presence of large amounts of cold gas in their brightest cluster galaxies {BCGs}. There are over 30 BCGs that exhibit active star formation based on their mid-infrared and several of those have direct evidence based on FUV and/or optical imaging. In this proposal we aim to investigate a sample of 11 BCGs forming the basis of a Herschel Key Project, which has been awarded 130 hrs to study the detailed properties of the cold gas and dust in these clusters. We propose ACS/SBC FUV observations of five of the 11 BCGs lacking high resolution FUV data needed to probe the star forming regions. The remaining six already have archival ACS/SBC FUV data. We further propose ACS/WFC and WFC3/UVIS observations of two BCGs lacking HST optical data which will allow us to obtain FUV-optical colours to discriminate between young and old stellar populations. These observations are vital to understand the complex inter-relationship between the cooling of the intracluster-medium, cold gas and dust, star formation and AGN activity.;
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