Mathematics – Logic
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21544007o&link_type=abstract
American Astronomical Society, AAS Meeting #215, #440.07; Bulletin of the American Astronomical Society, Vol. 42, p.398
Mathematics
Logic
Scientific paper
A major cosmological event is the formation of the first massive galaxies, which evolve to the luminous elliptical galaxies of today. Star formation in these galaxies was regulated and ultimately stifled by energetic AGN feedback processes, according to simulations. However, the nature of these processes is open to speculation because at these enormous distances, observations provide few constraints. Similar processes occur in some low redshift galaxy clusters where star formation and cold gas is detected in and around the brightest cluster galaxies. These modern-day analogs provide us with the opportunity to understand the heating, cooling, and star formation that occur on a grand scale at high redshift. In this Herschel Key Project, we will determine the location and mass of cooled gas, along with its temperature, ionization state, density and cooling rate. These new data, only possible with Herschel, are supplemented by radio, X-ray, and optical studies of the stars, hot gas, and AGN activity. To accomplish our goals, we will use PACS to measure the line strengths of [OI], [OIII], [NII], [CII] and [SiI], major coolants at low temperatures that also reflect the ionization state of the gas. In addition we will use PACS and SPIRE photometry to determine the distribution of dust temperatures and masses, and to detect cool gas clouds. These datasets will reveal the pathway from the hot ambient medium to cool gas to star formation, a process that was widespread when the universe was young. We will observe 11 BCGs selected to cover a range of X-ray luminosity, radio power, optical appearance, and predicted cold molecular gas mass. Observations of 3 objects - Zw3146, A1068, and A2597 - will be obtained during the Science Demonstration Phase. We will present early results if available.
Allen Stephanie
Baum Stefi
Boehringer Hans
Bregman Jesse
Bremer Malcolm
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