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The Gravitational Lensing in the QSO 1208+10 from the Proximity Effect in its Lyman alpha Forest
E. Giallongo, A. Fontana, S. Cristiani +1
The quasar Q1208+1011 (z_{em}=3.8) is the second highest redshift double quasar ever detected. Several indications point toward it being a gravitational lensed system, although a d…
The size and geometry of the Ly_alpha clouds
V. D'Odorico, S. Cristiani, S. D'Odorico +3
Spectra of the QSO pair Q0307-195A,B have been obtained in the Ly-alpha Forest (3660 - 3930 A) and C IV (4720 - 4850 A) regions with a FWHM resolution between 0.7 and 0.5 A. 46 lin…
The Photometric Redshift Distribution and Evolutionary Properties of Galaxies up to z= 4.5 in the Field of the Quasar BR1202-0725
E. Giallongo, S. D'Odorico, A. Fontana +4
We present a deep BVrIK multicolor catalog of galaxies in the field of the high redshift (z=4.7) quasar BR 1202-0725. Reliable colors have been measured for galaxies selected down…
Star-formation at z=4.7 in the environment of the QSO BR1202-07
A. Fontana, S. D'Odorico, E. Giallongo +3
We present here the spectrum of the galaxy companion to the z=4.7 quasar BR1202-0725, in the optical range 6000-9000 A, corresponding to 1050-1580 A rest-frame. We detect a strong…