Identification of Luminous Infrared Galaxies at 1 <~ z <~ 2.51,2,3,4,

Le Floc'h, E., Pérez-González, P. G., Rieke, G. H., Papovich, C., Huang, J.-S., Barmby, P., Dole, H., Egami, E., Alonso-Herrero, A., Wilson, G., Miyazaki, S., Rigby, J. R., Bei, L., Blaylock, M., Engelbracht, C. W., Fazio, G. G., Frayer, D. T., Gordon, K. D., Hines, D. C., Misselt, K. A., Morrison, J. E., Muzerolle, J., Rieke, M. J., Rigopoulou, D., Su, K. Y. L., Willner, S. P., & Young, E. T.
2004, The Astrophysical Journal Supplement Series, 154, 170


We present preliminary results on 24 μm detections of luminous infrared galaxies at z>~1 with the Multiband Imaging Photometer for Spitzer (MIPS). Observations were performed in the Lockman Hole and the Extended Groth Strip (EGS) and were supplemented by data obtained with the Infrared Array Camera (IRAC) between 3 and 9 μm. The positional accuracy of <~2" for most MIPS/IRAC detections provides unambiguous identifications of their optical counterparts. Using spectroscopic redshifts from the Deep Extragalactic Evolutionary Probe survey, we identify 24 μm sources at z>~1 in the EGS, while the combination of the MIPS/IRAC observations with BVRIJHK ancillary data in the Lockman Hole also shows very clear cases of galaxies with photometric redshifts at 1<~z<~2.5. The observed 24 μm fluxes indicate infrared luminosities greater than 1011 Lsolar, while the data at shorter wavelengths reveal rather red and probably massive (M>~M*) galaxy counterparts. It is the first time that this population of luminous objects is detected up to z~2.5 in the infrared. Our work demonstrates the ability of the MIPS instrument to probe the dusty universe at very high redshift and illustrates how the forthcoming Spitzer deep surveys will offer a unique opportunity to illuminate a dark side of cosmic history not explored by previous infrared experiments. Based on observations collected at the German-Spanish Astronomical Center, Calar Alto, operated jointly by Max-Planck-Institut für Astronomie and Instituto de Astrofísica de Andalucia (CSIC). Based on observations made with the Isaac Newton Telescope, operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.

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