IRS Spectra of Extreme IRAS Sources

Details IRS Spectra of Extreme IRAS Sources IRS Spectra of Extreme IRAS Sources

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30121h&link_type=abstract

Spitzer Proposal ID #30121

Computer Science

Scientific paper

The 28 optically-faintest targets (E mag > 18) from the IRAS FSC survey, chosen by identification with the FIRST radio survey, will be observed in the full low resolution modes of the Spitzer IRS in order to provide a comparison sample for high redshift objects which we discovered in previous GTO observations on the basis of extreme Inrared/optical ratios. The median IR/optical of this new sample is 40, whereas the same ratio is ~10 in the classical ULIRGS Markarian 231 and Arp 220, implying that the new sample is much more obscured than typical ULIRGS. Median IRAS 25u flux density is 140 mJy, so IRS exposures are short, requiring only 16 minutes per source. Results will provide a relatively local comparison sample for measuring strength of silicate absorption and PAH emission features. This will enable determination of whether our high redshift samples are biassed toward AGN and whether we should always expect to find sufficiently strong features for redshift identification. To complete an unbiased flux-limited sample of infrared sources for comparison to the extreme sources, we will also observe ten sources brighter than 10 mJy at 24u in our Bootes survey field, to finish the total sample of 32 such sources.

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