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Published September 2007 | Published
Journal Article Open

COSBO: The MAMBO 1.2 Millimeter Imaging Survey of the COSMOS Field


The inner 20 × 20 arcmin^2 of the COSMOS field was imaged at 250 GHz (1.2 mm) to an rms noise level of ~1 mJy per 11" beam using the Max-Planck Millimeter Bolometer Array (MAMBO-2) at the IRAM 30 m telescope. We detect 15 sources at significance between 4 and 7 σ, 11 of which are also detected at 1.4 GHz with the VLA with a flux density >24 μJy (3 σ). We identify 12 more lower significance mm sources based on their association with faint radio sources. We present the multifrequency identifications of the MAMBO sources, including VLA radio flux densities, optical and near-infrared identifications, as well as the XMM-Newton X-ray detection for two of the mm sources. We compare radio and optical photometric redshifts and briefly describe the host galaxy morphologies. The colors of the identified optical counterparts suggest most of them to be high-redshift (z ~ 2-3) star-forming galaxies. At least three sources appear lensed by a foreground galaxy. We highlight some MAMBO sources that do not show obvious radio counterparts. These sources could be dusty starburst galaxies at redshifts >3.5. The 250 GHz source areal density in the COSMOS field is comparable to that seen in other deep mm fields.

Additional Information

© 2007 The American Astronomical Society. Received 2006 September 22; accepted 2007 April 25. The research of the Bonn-Heidelberg group was supported through a grant from the Deutsche Forschungsgemeischaft within the focus program SPP1177. K. J. acknowledges support by the German DFG under grant SCHI 536/3-1. We gratefully acknowledge the contributions of the entire COSMOS collaboration consisting of more than 70 scientists. More information on the COSMOS survey is available at http://www.astro.caltech.edu/~cosmos. We thank Mara Salvato and the anonymous referee for helpful comments. Facilities: IRAM (30 m), HST (ACS), VLA, Subaru, XMM, CSO (Bolocam), KPNO (FLAMINGOS)

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August 22, 2023
October 19, 2023