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Astron. Astrophys. 360, 92-98 (2000)


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Three high-redshift millimeter sources and their radio and near-infrared identifications

F. Bertoldi 1, C.L. Carilli 1,2, K.M. Menten 1, F. Owen 2,6, A. Dey 3, F. Gueth 1, J.R. Graham 4, E. Kreysa 1, M. Ledlow 5,6, M.C. Liu 4, F. Motte 1, L. Reichertz 1, P. Schilke 1 and R. Zylka 1

1 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
2 National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801, USA
3 National Optical Astronomy Observatory, Tucson, AZ 85719, USA
4 University of California at Berkeley, Astronomy Department, Berkeley, CA 94720, USA
5 Gemini Observatory, AURA, Casilla 603, La Serena, Chile
6 Visiting astronomer, Kitt Peak National Observatory, NOAO, Tucson, AZ 85719, USA

Received 14 March 2000 / Accepted 9 June 2000

Abstract

We present millimeter wavelength detections of three faint sources that are most likely high-redshift starburst galaxies. For one of the sources, which was previously discovered with SCUBA at 850 µm, we present a detection with the IRAM interferometer at 240 GHz (1.25 mm) that shows the object unresolved at an angular resolution of [FORMULA], and coincident within 1" with a radio source and a galaxy detected in the near-infrared. The two other sources were discovered in a deep 250 GHz (1.2 mm) survey with the Max-Planck Millimeter Bolometer (MAMBO) array at the IRAM 30 m telescope. Both have fluxes of [FORMULA] mJy and radio counterparts with a 1.4 GHz flux density of [FORMULA]Jy. Their radio-to-mm flux ratios suggest redshifts larger than 2. Both sources are faint in the optical and near-infrared, one showing a 20.5 mag K-band counterpart. From our data and that available in the literature, we estimate the redshift distribution of twenty-two faint mm and sub-mm sources and conclude that the majority of them are likely to be at [FORMULA].

Key words: galaxies: distances and redshifts – galaxies: luminosity function, mass function – cosmology: observations – cosmology: early Universe – cosmology: large-scale structure of Universe – radio continuum: galaxies

Send offprint requests to: Bertoldi@MPIfR-Bonn.MPG.de

© European Southern Observatory (ESO) 2000

Online publication: July 27, 2000

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