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Astron. Astrophys. 328, L1-L4 (1997)

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Letter to the Editor

The second detection of CO at redshift larger than 4

S. Guilloteau 1, A. Omont 2, R.G. McMahon 3, P. Cox 4 and P. Petitjean 2

1 IRAM, 300 rue de la Piscine, F-38406 Saint Martin d'Hères Cedex, France
2 Institut d'Astrophysique de Paris, CNRS, 98bis Bd Arago, F-75014 Paris, France
3 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, U.K.
4 Institut d'Astrophysique Spatiale, Université Paris 11, F-91406 Orsay Cedex, France

Received 29 August 1997 / Accepted 16 September 1997

Abstract

We report the detection with the IRAM interferometer at 3 mm of J=5-4 CO line in the radio quiet quasar BRI 1335-0415 at redshift of [FORMULA]. After BR 1202-0725 at [FORMULA] (Ohta et al. 1996, Omont et al. 1996a), this is the second detection of CO at [FORMULA]. The integrated line intensity is [FORMULA] Jy km s-1 with a linewidth of 420 [FORMULA] 60 km s-1. The dust continuum emission has also been mapped at 1.35 mm. The 1.35 mm flux is found to be 5.6 [FORMULA] 1.1 mJy. The ratio of the CO to 1.35 mm continuum flux is slightly larger than for BR 1202-0725. Contrary to the case of BR 1202-0725, there is only marginal evidence of extension of the 1.35 mm continuum and 3mm CO emission. In the absence of gravitational lensing, for which there is no a priori evidence, and within the uncertainties of the CO to M(H2) conversion factors, the mass of molecular gas M(H2) could be [FORMULA] M [FORMULA].

Key words: galaxies: formation – quasars: emission lines – quasars: BRI 1335-0415 – Cosmology: observations – Cosmology: early universe – Radio lines: galaxies

Send offprint requests to: S.Guilloteau
Correspondence to: guillote@iram.fr

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© European Southern Observatory (ESO) 1997

Online publication: March 24, 1998

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