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A. Kovács, C.D. Dowell, C. Borys, M. Yang, T.G. Phillips (Caltech)
We report intermediate results from four distinct extra-galactic surveys taken at 350 microns using the SHARC-2 camera at the Caltech Submillimeter Observatory. The galaxies observed range from local group galaxies to distant objects, covering all distance scales up to redshifts in the neighborhood of z ~ 3. From the nearby universe, our sample includes follow-up observations of the SCUBA Local Universe Galaxy Survey (SLUGS) of several dozen objects, and a smaller sample of a handful of interacting galaxies. At intermediate distances (z ~ 0.1-1) we have successfully observed 27 galaxies from Stanford's sample of ULIRG's, 26 of which have been detected at submillimeter wavelengths for the first time. Last but not least, we present several sources from the high redshift universe in complement to existing optical and 850um submillimeter data. The importance of 350 micron observations owes to the ability to better constrain spectral energy distributions (SED's) from dust emission, and determine far infrared luminosities of the emitting objects. The wavelength is especially useful in case of the distant objects, both because of the lack of other SED constraining data points, and because it falls on the near side of the typical dust emission peak. Accordingly, based on our observation data we present spectral energy distribution templates for the different redshift regimes under study, and report derived dust temperatures and far infrared luminosities for all objects. Furthermore, we conclude that our first high redshift results seem to confirm the validity of using photometric redshift determination in cases when the redshift is not otherwise known or obtainable.
This research has been funded by a National Science Foundation grant.
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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.