Spitzer Observations of the SCUBA/VLA Sources in the Lockman Hole: Star Formation History of Infrared-Luminous Galaxies

E. Egami, H. Dole, J.-S. Huang, P. Perez-Gonzalez, E. Le Floc'h, C. Papovich, P. Barmby, R. J. Ivison, S. Serjeant, A. Mortier, D. T. Frayer, D. Rigopoulou, G. Lagache, G. H. Rieke, S. P. Willner, A. Alonso-Herrero, L. Bai, C. W. Engelbracht, G. G. Fazio, K. D. Gordon, D. C. Hines, K. A. Misselt, S. Miyazaki, J. E. Morrison, M. J. Rieke, J. R. Rigby, & G. Wilson 2004, ApJS, 154, 130

We present Spitzer Space Telescope imaging observations at 3.6, 4.5, 5.8, 8.0, and 24 µm of the SCUBA submillimeter sources and µJy VLA radio sources in a 5'×5' area in the Lockman Hole East region. Out of the approx. 40 SCUBA/VLA sources in the field, Spitzer counterparts were detected for nearly all except for the few low-weight SCUBA detections. We show that the majority (80%-90%) of the detected sources are cold (i.e., starburst-like) infrared-luminous galaxies (LIR > 1011 Lsolar) at redshift 0.5<z<3.5, whose star-formation rate density (SFRD) is comparable to that of the optically selected star-forming galaxies.

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