Mathematics – Logic
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12264m&link_type=abstract
HST Proposal ID #12264. Cycle 18
Mathematics
Logic
Scientific paper
The way in which gas cools and contracts into gravitational potentials dominated by dark matter to form stars {and hence galaxies}, and the way in which these stars and their deaths then affect the incoming gas, is a topic of great importance and high current interest. It was also recognised as a key science goal for HST by some of its original builders such as Bahcall, Spitzer and Salpeter.We propose to use COS to complement and extend the planned COS GTO and GO surveys by extending to higher redshifts {z<1.2}, and also by substantially increasing the redshift pathlength within which both the gas and the galaxy distributions are known. We will do this by observing the lines-of-sight to four carefully selected QSOs in regions of the sky with extensive deep galaxy redshift surveys {VVDS and GDDS} already in place. This will allow us to study the evolution in the relationship between gas and galaxies over the second half of the history of the Universe and over a large range of physical scales. By comparing with independent, state-of-the-art hydrodynamic cosmological models, we will test our understanding of the formation of galaxies, and determine whether the AGN and supernova feedback prescriptions currently used in these simulations are correct. It is likely that only by using the combination of absorption line information from hydrogen and metals, with large galaxy samples, that the complexities of the feedback process can be unscrambled. We have assembled a strong consortium of experts in HST absorption line analysis, deep galaxy redshift surveys, and cosmological simulations including baryons. With this team, and the proposed observations, we are confident that our understanding of galaxy formation and evolution can be significantly improved.;
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