We identify 17 possible 8.0 micron-selected counterparts to the submillimeter
galaxies in the CUDSS 14-hour field, derived from deep imaging carried out with
the IRAC and MIPS instruments aboard the Spitzer Space Telescope. Ten of the 17
counterparts are not the same as those previously identified at shorter
wavelengths. We argue that 8.0 micron selection offers a better means for
identifying counterparts to submillimeter galaxies than near-infrared or
optical selection. Based on the panchromatic SEDs, most counterparts appear to
be powered by ongoing star formation. Power-law fits to the SEDs suggest that
five objects in the 8.0 micron-selected counterpart sample harbor dominant
AGNs; a sixth object is identified as a possible AGN. The 3.6 to 8.0 micron
colors of the infrared-selected counterparts are significantly redder than the
general IRAC galaxy population in the CUDSS 14-hour field.Comment: 36 pages, 9 figures, accepted by the Astrophysical Journal. This
version corrects the bibliography and typographical errors in the text and
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