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

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 <sup>1

1</sup> 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 , 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 mJy and radio counterparts with a 1.4 GHz flux density of 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 .

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

SIMBAD Objects

Contents

• 1. Introduction
• 2. Observations and results
  • 2.1. Previous observation of CFRS14A
  • 2.2. Interferometric observation of CFRS14A
  • 2.3. Sources from the MAMBO millimeter survey
    • 2.3.1. R-band
    • 2.3.2. J-band
    • 2.3.3. K-band
• 3. Discussion
  • 3.1. Redshift estimates
  • 3.2. Redshift distribution
• Acknowledgements
• References

© European Southern Observatory (ESO) 2000

Online publication: July 27, 2000
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