Infrared Properties of Radio-selected Submillimeter Galaxies in the Spitzer First Look Survey Verification Field

September 2004 • 2004ApJS..154..137F

Authors • Frayer, D. T. • Chapman, S. C. • Yan, L. • Armus, L. • Helou, G. • Fadda, D. • Morganti, R. • Garrett, M. A. • Appleton, P. • Choi, P. • Fang, F. • Heinrichsen, I. • Im, M. • Lacy, M. • Marleau, F. • Masci, F. J. • Shupe, D. L. • Soifer, B. T. • Squires, G. K. • Storrie-Lombardi, L. J. • Surace, J. A. • Teplitz, H. I. • Wilson, G.

Abstract • We report on submillimeter and infrared observations of 28 radio-selected galaxies in the Spitzer First Look Survey verification field. All of the radio-selected galaxies that show evidence for emission at 850 μm with SCUBA have Spitzer counterparts at 24 μm, while only half of the radio-selected galaxies without 850 μm emission have detectable counterparts at 24 μm. The data show a wide range of infrared colors (S_70μm/S_24μm<5-30, S_8μm/S_3.6μm<0.3-4), indicative of a mixture of infrared-warm AGN-dominated and cooler starburst-dominated sources. The galaxies showing 850 μm emission have Spitzer flux densities and flux density ratios consistent with the range of values expected for high-redshift (z=1-4) ultraluminous infrared galaxies.

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