The Nature of 350 μ m-selected Galaxies

Details The Nature of 350 μ m-selected Galaxies The Nature of 350 μ m-selected Galaxies

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20720206k&link_type=abstract

American Astronomical Society Meeting 207, #202.06; Bulletin of the American Astronomical Society, Vol. 37, p.1501

Astronomy and Astrophysics

Astronomy

Scientific paper

As part of an ongoing blank deep field extragalactic survey, using the 350 μ m-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 1σ 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 (3.6σ , designated SSG 1) is also detected by Spitzer (IRAC and MIPS-24 μ m), 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 μ m, a photometric redshift of ˜1, and a predicted 850 μ m 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 3σ detection of sources at z ˜1. By selecting sources at 350 μ m 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 μ m 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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