Continuum Observations at 350 microns of High-Redshift Molecular Emission Line Galaxies

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We report observations of 15 high redshift (z = 1 - 6) molecular emission line galaxies at 350 microns using the SHARCII array detector at the Caltech Submillimeter Observatory. Detections were made of eight galaxies, including one possible detection. Using a single-temperature optically-thin greybody model, we fit the spectral energy density to the data of the detected galaxies and derived their far-infrared luminosities, star formation rates, and dust masses. The star formation rates of these galaxies range from 10 to 2100 Msun/yr, with a median of 330 Msun/yr. The mean star formation efficiency of the detected galaxies is 2.4 X 10^4 Lsun/Msun, with a median of 1.8 X 10^4 Lsun/Msun. The star formation rates and efficiencies are comparable to those reported in other high redshift molecular emission line galaxies. We analyze the data in terms of a model in which the starburts galaxies are composed of many dense star-forming clumps with properties based on such objects found in the Milky Way. This work was supported in part by NSF grant AST-0607793.

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