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Published July 20, 2014 | Submitted + Published
Journal Article Open

The GISMO Two-millimeter Deep Field in GOODS-N

Abstract

We present deep continuum observations using the GISMO camera at a wavelength of 2 mm centered on the Hubble Deep Field in the GOODS-N field. These are the first deep field observations ever obtained at this wavelength. The 1σ sensitivity in the innermost ~4' of the 7' diameter map is ~135 μJy beam^(−1), a factor of three higher in flux/beam sensitivity than the deepest available SCUBA 850 μm observations, and almost a factor of four higher in flux/beam sensitivity than the combined MAMBO/AzTEC 1.2 mm observations of this region. Our source extraction algorithm identifies 12 sources directly, and another 3 through correlation with known sources at 1.2 mm and 850 μm. Five of the directly detected GISMO sources have counterparts in the MAMBO/AzTEC catalog, and four of those also have SCUBA counterparts. HDF850.1, one of the first blank-field detected submillimeter galaxies, is now detected at 2 mm. The median redshift of all sources with counterparts of known redshifts is med(z) = 2.91±0.94. Statistically, the detections are most likely real for five of the seven 2 mm sources without shorter wavelength counterparts, while the probability for none of them being real is negligible.

Additional Information

© 2014 The American Astronomical Society. Received 2013 February 22; accepted 2014 June 7; published 2014 July 7. We would like to thank Carsten Kramer, Santiago Navarro, David John, Albrecht Sievers, and the entire IRAM Granada staff for their support during the instrument installation and observations. IRAM is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain). This work was supported through NSF ATI grants 1020981 and 1106284. Facility: IRAM:30m (GISMO) - Institute de Radioastronomie Millimetrique 30 meter telescope

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Published - 0004-637X_790_1_77.pdf

Submitted - 1311.1485v3.pdf

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