Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40460o&link_type=abstract
Spitzer Proposal ID #40460
Physics
Scientific paper
The origin of hot baryons in the massive intracluster media of galaxy clusters is an unsolved mystery. We will map the potential sources of hot baryons in a high-redshift, radio-selected galaxy protocluster. We propose a very deep (6 hr/pixel), 2 square arcminute spectral map of the redshift z=2.156 protocluster surrounding the MRC 1138-262 radio galaxy. Spitzer IRS LL observations will map star formation, AGN activity, and shocked molecular hydrogen in a large number of cluster galaxies. The recent Spitzer discovery of massive, high luminosity molecular hydrogen emission in galaxy clusters and radio galaxies motivates our search. High-velocity galaxy collisions, starburst super-winds, relativistic radio jets, and cluster accretion shocks are all potential mechanisms for shocking, disrupting, and removing the cool baryons in galaxy potential wells and ejecting them into the intracluster medium. Spitzer is sensitive to all of these processes through detection of the pure-rotational lines of molecular hydrogen and PAH emission from luminous, star-forming infrared galaxies and AGNs.
Appleton Phil
Fadda Dario
Ogle Patrick
Seymour Nick
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