Deep IRAC Imaging of 24-micron Only Sources: Constraining the SEDs

Details Deep IRAC Imaging of 24-micron Only Sources: Constraining the SEDs Deep IRAC Imaging of 24-micron Only Sources: Constraining the SEDs

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sptz.prop60180s&link_type=abstract

Spitzer Proposal ID #60180

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Scientific paper

We request 17 hours for deep 3.6 micron IRAC observations of three extraordinary objects that are very bright at 24 microns, but are undetected at all other Spitzer, optical, or near-infrared wavelengths. Found in the widest of the extragalactic areal surveys (SWIRE; 45 square degrees) these are the only such objects found by Spitzer. Followup infrared spectroscopy centered on the 24-micron band indicates that at least two of the objects are extragalactic in nature and lie near a redshift of 2.5. However, the photometric non-detections are not compatible with the spectral energy distribution (SED) of any known class of objects. The new Spitzer data will lower the detection limits by an order of magnitude relative to the existing data, providing much stronger limits on the rest-frame near-IR luminosity.

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