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Astron. Astrophys. 328, L1-L4

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Letter to the Editor

The second detection of CO at redshift larger than 4

S. Guilloteau1, A. Omont2, R.G. McMahon3, P. Cox4, and P. Petitjean2

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

Received 29 August 1997 / Accepted 16 September 1997


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 z=4.41. After BR 1202-0725 at z=4.69 (Ohta et al. 1996, Omont et al. 1996a), this is the second detection of CO at z>3. The integrated line intensity is $2.8 \pm 0.3$ Jy km s-1 with a linewidth of 420$\pm$60 km s-1. The dust continuum emission has also been mapped at 1.35 mm. The 1.35 mm flux is found to be 5.6$\pm$1.1 mJy. The ratio of the CO to 1.35 mm continuum flux is slightly larger than for BR 1202-0725. Contrary to the case of BR 1202-0725, there is only marginal evidence of extension of the 1.35 mm continuum and 3mm CO emission. In the absence of gravitational lensing, for which there is no a priori evidence, and within the uncertainties of the CO to M(H2) conversion factors, the mass of molecular gas M(H2) could be 1011M$_\odot$.

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

© European Southern Observatory (ESO) 1997

Online publication: October 30, 1997
Last change: March 24, 1998