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Clustering of Absorbers
S. Cristiani, S. D'Odorico, V. D'Odorico +4
The observed clustering of Lyman- lines is reviewed and compared with the clustering of CIV systems. We argue that a continuity of properties exists between Lyman- and metal…
The Optical-UV Continuum of a Sample of QSOs
F. Natali, E. Giallongo, S. Cristiani +1
The average optical-UV continuum shape of QSOs has been investigated using spectra of 62 QSOs having good relative photometric calibrations. The QSO spectra were extracted from two…
Quasar clustering: evidence for an increase with redshift and implications for the nature of AGNs
Fabio La Franca, Paola Andreani, Stefano Cristiani
The evolution of quasar clustering is investigated with a new sample of 388 quasars with 0.3<z<=2.2, B<=20.5 and Mb<-23, selected over an area of 24.6 sq. deg. in the South Galacti…
The UV Background and the Lyman alpha Clouds at High Redshift
E. Giallongo, S. Cristiani, S. D'Odorico +2
The estimate of the ionizing UV background through the proximity effect analysis is discussed. Taking into account the correct bending of the column density distribution which appe…
The absorption spectrum of the QSO PKS 2126-158 (z_em = 3.27) at high resolution
V. D'Odorico, S. Cristiani, S. D'Odorico +2
Spectra of the z_em = 3.268 quasar PKS 2126-158 have been obtained in the range lambda lambda 4300-6620 A with a resolution R = 27000 and an average signal-to-noise ratio s/n = 25…