Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-08
Astrophys.J. 644 (2006) 778-791
Astronomy and Astrophysics
Astrophysics
36 pages, 9 figures, accepted by the Astrophysical Journal. This version corrects the bibliography and typographical errors in
Scientific paper
10.1086/503861
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.
Ashby Matt L. N.
Blaylock Myra
Brodwin Mark
Cadien James
Dye Simon
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