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Title:
The Masses and Luminosities of Submillimeter-Selected Galaxies
Authors:
Hainline, Laura J.
Affiliation:
AA(Caltech)
Publication:
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #195.02; Bulletin of the American Astronomical Society, Vol. 38, p.1171
Publication Date:
12/2006
Origin:
AAS
Bibliographic Code:
2006AAS...20919502H

Abstract

The observed far-infrared SEDs of the population of high-redshift galaxies revealed through deep submillimeter surveys suggest that the population is characterized by large bolometric luminosities, mostly emitted at infrared wavelengths. As X-ray observations indicate that this luminosity is dominated by reprocessed emission from obscured star formation, star formation rates of 1000 Msol yr-1 are required to account for the enormous IR emission inferred from the SEDs, leading to the hypothesis that submillimeter-selected galaxies represent the formation epoch of the massive bulges and ellipticals observed locally. However, our knowledge of the SEDs of submillimeter-selected galaxies in the near and mid-IR and their total mass has until recently been limited by the faintness of the galaxy population; thus, our estimates of the IR luminosity of the galaxies, their stellar content, and the mass of gas available for conversion into stars have been poorly constrained. The mid-IR windows opened up by the Spitzer Space Telescope, together with its unprecedented sensitivity, allow us to fill in the gaps in the IR SEDs of submillimeter-selected galaxies and determine the relative contributions to their luminosities from stars, dust, and AGN, while the wide-bandwidth spectrometer and 18-40 GHz receivers at the GBT permit us to measure their total molecular gas masses. We have exploited the unique capabilities of both Spitzer and the GBT by obtaining IRAC and MIPS imaging of a sample of 100 submillimeter-selected galaxies with redshifts confirmed through optical spectroscopy, and GBT spectroscopy of a subsample of these objects. We present here new estimates of stellar mass and age derived from IRAC data and IR luminosity from MIPS data, plus estimates of molecular hydrogen mass in galaxies with GBT observations.
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