AAS 207th Meeting, 8-12 January 2006
Session 202 Galaxies and their Components
Oral, Thursday, 2:00-3:30pm, January 12, 2006, Virginia

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[202.06] The Nature of 350\,\mum-selected Galaxies

S.A. Khan (Imperial College London/GSFC), M.L.N. Ashby (Harvard/Smithsonian Center for Astrophysics), D.J. Benford (NASA/GSFC), D.L. Clements (Imperial College London), E. Dwek, S.H. Moseley, R.A. Shafer (NASA/GSFC), T.J. Sumner (Imperial College London), S.P. Willner (Harvard/Smithsonian Center for Astrophysics)

As part of an ongoing blank deep field extragalactic survey, using the 350\,\mum-optimised second generation Submillimeter High Angular Resolution Camera (SHARC~II) at the Caltech Submillimeter Observatory, we have imaged a 6 square arcminute region in the Boötes Deep Field to a 1\sigma sensitivity of 6\,mJy. Our survey is expected to be dominated by luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs) around the peak of their spectral energy distribution, at 1< z <3, the epoch of peak cosmic star formation rate. Our most significant source (3.6\sigma, designated SSG~1) is also detected by Spitzer (IRAC and MIPS-24\,\mum), with additional optical/NIR photometry from the NOAO-NDWFS and FLAMEX surveys. SSG~1 is a ULIRG with a warmer dust temperature than ULIRGs selected at 850\,\mum, a photometric redshift of ~1, and a predicted 850\,\mum flux density near the SCUBA detection threshold. We also characterise the submillimetre properties of IRAC-selected sources in the Boötes field via a stacking analysis, finding a 3\sigma detection of sources at z~1. By selecting sources at 350\,\mum we can begin to address the parameter space of shorter-wavelength submillimetre galaxies (e.g., redshift, luminosity, dust temperature, mergers, AGN), their evolution and their relation to locally selected IRAS and high redshift 850\,\mum SCUBA galaxies. These considerations are necessary for planning future surveys in this waveband (e.g., with Herschel) and to characterise the submillimetre population as a whole.

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