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C.L. Carilli (NRAO), F. Bertoldi (Bonn Univ), E. Schinnerer (MPIA), H. Voss (MPIfR), V. Smolcic (MPIA), A. Blain, N. Z. Scoville (Caltech), K. Menten (MPIfR), D. Lutz (MPE), Cosmos
The inner 20\times20 arcmin2 of the COSMOS field was imaged at 250 GHz (1.2 mm) to an rms noise level of 1 mJy per 11 arcsec beam using the Max-Planck Millimeter Bolometer Array (MAMBO-2) at the IRAM 30-m telescope. We detect 23 sources at significance between 3.5 and 7\sigma, about half of which are also detected at 1.4 GHz with the VLA with a flux density >3\sigma= 30 \muJy. The 250 GHz source areal density in the COSMOS field is comparable to that seen in other deep mm fields. We present the multi-frequency properties of the MAMBO sources, including: (i) HST/ACS i magnitudes (or limits) and morphologies, (ii) ground-based optical and near-IR magnitudes, (iii) XMM X-ray flux densities, and (iv) VLA radio flux densities. We compare radio and optical photometric redshifts, discuss the AGN fraction derived from the X-ray data, and describe the host galaxy properties apparent from the HST and ground based optical imaging. We highlight some relatively bright MAMBO sources that do not show obvious optical counterparts to very faint levels (i'AB > 26.9). These sources could be dusty starburst galaxies at redshifts >3.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.