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S. Guilloteau , A. Omont , R.G. McMahon ,
P. Cox , P. Petitjean
Institut de RadioAstronomie Millimétrique, 300
rue de la Piscine, F-38406 Saint Martin d'Hères, France
Institut d'Astrophysique de Paris, CNRS, 98bis Bd Arago,
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, U.K.
Institut d'Astrophysique Spatiale, Université Paris 11,
F-91406 Orsay Cedex
Abstract: We report the detection with the IRAM interferometer at 3mm of
J=5-4 CO line in the radio quiet quasar BRI 1335-0415 at redshift of
z=4.41 (Fig. 7). After BR 1202-0725 at z=4.69 (Ohta
1996, Omont 1996a), this is the second detection of CO
at z>3. The integrated line intensity is Jy km s with a linewidth of 420 60 km s . The
dust continuum emission has also been mapped at 1.35 mm
(Fig. 6). The 1.35 mm flux is found to be 5.6 1.1 mJy.
The ratio of the CO to 1.35mm 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(H ) conversion factors, the mass of molecular gas
M(H ) could be M .
Figure: 1.35 mm continuum map of BRI 1335-0415. Contour step is 1 mJy/beam,
and the rms noise 0.7 mJy/beam. The cross indicates the optical position.
Figure: Spectrum of the CO J=5-4 line towards BRI 1335-0415,
superimposed with the best Gaussian profile. Errorbars are . The velocity scale corresponds to a frequency of 106.570
GHz corresponding to a redshift .