Computer Science
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40508j&link_type=abstract
Spitzer Proposal ID #40508
Computer Science
Scientific paper
We propose to observe massive galaxies forming at the centers of two z>2 protoclusters at z>2 with the IRS/SL2 spectrometer. Our aim is to detect the 1-0S lines (restframe K-band) that are markers of gas cooling and feedback reheating processes. These processes, which we have shown to be present in low-z 'cooling flow' clusters, are required during galaxy formation in the early Universe to produce present-day galaxy populations. The ratio of the 1-0S lines to the nearby Paschen alpha line is a clear indicator of whether feedback is taking place. The targets were chosen on the basis of their large IR luminosities, the associated giant ionized gas halos, high H-alpha brightnesses and extreme star formation rates. They are the typical progenitors of the galaxies that dominate present day clusters. In addition to indicating the presence of feedback, the Spitzer spectra. when compared to groundbased Halpha will allow an accurate estimate of the currently unknown dust extinction in the clusters.
Bremer Malcolm
Hatch Nina
Jaffe Walter
Miley George
Oonk Raymond
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