Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-02-02
Astronomy and Astrophysics
Astrophysics
To appear in "Molecular Lines at High Redshift". Greenbank Oct. 97. C. Arilli, S. Radford, K. Menten eds. Latex with paspconf.
Scientific paper
We present a new investigation of the Cloverleaf (z$=$2.56) based on the HST/WFPC2, IRAM and CFHT/FOCAM images data. The WFPC2 data shows a significant overdensity of galaxies around the Cloverleaf that we interpret as the presence of a distant cluster of galaxies along the line of sight. The Cloverleaf is probably the result of the lensing effects which include, in addition to a single galaxy, a distant clusters of galaxies. We have modelled the lens accordingly. The high-resolution IRAM/CO map provides the orientation and the ellipticity of the CO spots induced by the shear component. Velocity-positional effects are detected at the 8$\sigma$ level in the CO map. A strong limit can then be put on the size, shape and location of the CO source around the quasar. The CO source is found to form a disk- or ring- structure orbiting the central engine at $\sim$ 100km/s at a radial distance of $\sim$ 100pc, leading to a central mass of $\sim$ 10$^{9}$ M$_\odot$ possibly in the form of a black hole.
Alloin Danielle
Kneib Jean Paul
Mellier Yannick
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