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

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

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sptz.prop70039s&link_type=abstract

Spitzer Proposal ID #70039

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Scientific paper

We request 10.6 hours to complete deep imaging at 3.6 and 4.5 microns with IRAC of a sample of fourteen extraordinary objects that are very bright at 24 microns, but were undetected at all other Spitzer, optical, or near-infrared survey 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. Ultradeep IRAC observations of a handful of these objects in the last Spitzer cycle provided the first detections at 3.6 microns; interestingly, some are significantly brighter than they were five years ago, suggesting a role for variability in these objects. Based on this pilot deep imaging, we believe all the objects will be detected in the imaging requested here, or will have detection limits more than a magnitude fainter than the current ones. The new photometric points will be crucial for constraining the spectral shapes, the rest-frame near-IR luminosity, and for determining the extent of variability in the sample.

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