Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40793s&link_type=abstract
Spitzer Proposal ID #40793
Physics
Scientific paper
Spitzer spectra have enabled detailed studies of the physical properties of the dense, obscuring medium surrounding local deeply embedded nuclei. We propose to extend these studies to z~2 with observations of a sample of 10 z~2 highly obscured ULIRGs, selected from our existing large sample. By obtaining high S/N ratio spectra covering the rest-frame 3-8 microns for this sample we can derive a quantitative description of: (1) the hot inner obscuring shell as given by the 3-5micron hot dust continuum, and the 4.67micron CO gas absorption feature; (2) the cold outer obscuring shell as given by the silicate feature and 3.0 and 6.0micron water ice absorption; and (3) the star-formation activity outside the buried nucleus as probed by the PAH 6.2 micron feature. The proposed spectra will allow a direct comparison with ongoing studies of highly obscured sources locally. Given the upcoming end of the Spitzer mission, and hence lack of opportunity in the near future for mid-IR spectroscopy of high-z ULIRGs, the proposed data will be invaluable in current and future efforts to understand these enigmatic sites of black hole growth and nuclear star formation.
Dasyra Kalliopi
Elitzur Moshe
Sajina Anna
Spoon Henrik
Yan Lin
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