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D.Alloin , S.Guilloteau , R.Barvainis ,
R.Antonucci , L.Tacconi
Service d'Astrophysique, CE Saclay, 91191 Gif-sur-Yvette Cedex,
Institut de Radio Astronomie Millimétrique,
300 Rue de la Piscine, F-38406 Saint Martin d'Hères, France
MIT Haystack Observatory, Westford, MA 01886, USA
UC Santa Barbara, Physics Department, Santa Barbara, CA 93106 USA
Max Planck Institut fur extraterrestrische Physik, D-85748 Garching,
Abstract: We report 0.5'' resolution imaging of the Cloverleaf quasar in the
CO(7-6) line and 1.3 mm continuum,, as well as 1'' resolution
imaging in the CO(3-2) line, performed with the IRAM
interferometer. The CO(7-6) image is clearly resolved into 4 spots,
demonstrating that the CO emission is also gravitationally lensed.
We do not find any convincing evidence for a velocity gradient
in the maps.
As compared to the optical spots from a V band HST image,
some of the CO spots are found to be stretched along the
Einstein ring. Using the available lens model for the Cloverleaf,
this suggests an intrinsic radius of pc for the CO emitting region.
No continuum emission is detected: the measured flux density is mJy,
consistent with a spectral index larger than 3.