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The QSO evolution derived from the HBQS and other complete QSO surveys
Fabio La Franca, Stefano Cristiani
An ESO Key programme dedicated to an Homogeneous Bright QSO Survey (HBQS) has been completed. 327 QSOs (Mb<-23, 0.3<z<2.2) have been selected over 555 deg^2 with 15<B<18.75. For B<…
The optical variability of QSOs. II. The wavelength dependence
S. Cristiani, S. Trentini, F. La Franca +1
The long-term variability of a sample of 149 optically selected QSOs in the field of the Selected Area 94 has been studied in the R-band. The relations between variability and lumi…
The QSO evolution derived from the HBQS and other complete QSO surveys
Fabio La Franca, Stefano Cristiani
An ESO Key programme dedicated to an Homogeneous Bright QSO Survey (HBQS) has been completed. 327 QSOs (Mb<-23, 0.3<z<2.2) have been selected over 555 deg^2 with 15<B<18.75. For B<…
The clustering properties of the Lyman-alpha clouds
S. Cristiani, S. D'Odorico, V. D'Odorico +3
We analyze the clustering properties of a high-resolution (~10 km/s) sample of about 1600 Lyman-alpha lines in the spectra of 15 quasars, obtained in the framework of an ESO key-pr…
The shape of the ionizing UV background at from the metal absorption systems of Q
S. Savaglio, S. Cristiani, S. D'Odorico +3
Spectra of the \ze~ quasar Q have been obtained in the range Å~with a resolution of 13 \kms~and signal--to--noise ratio of per resolut…
Search for Galaxies at z>4 from a Deep Multicolor Survey
E. Giallongo, S. Charlot, S. Cristiani +2
We present deep BVrI multicolor photometry in the field of the quasar BR1202-07 (z_{em}=4.694) aimed at selecting field galaxies at z>4. We compare the observed colors of the galax…
The Proximity Effect, the UV Background and the Statistics of the Lyman-Alpha Lines at High Resolution
E. Giallongo, S. Cristiani, S. D'Odorico +2
We present results from high resolution (R\simeq 28000) spectra of six high- redshift QSOs taken at the ESO NTT telescope that allow the detailed study of the Ly-alpha population i…
The Optical Identification of a Primeval Galaxy at z >~ 4.4
Adriano Fontana, Stefano Cristiani, Sandro D'Odorico +2
We have obtained with the SUSI CCD camera on the ESO 3.5m NTT deep images in the BVRI bands of the field centered on the QSO BRI 1202-0725 (). In the final combin…