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Optical Spectroscopy of Active Galactic Nuclei in SA57
D. Trevese, V. Zitelli, F. Vagnetti +2
The cosmological evolution of X-ray-selected and optically selected Active Galactic Nuclei (AGNs) show different behaviours interpreted in terms of two different populations. The d…
XMM-Newton observation of the cluster ZW 1305.4+2941 in the field SA 57
Fabio Gastaldello, Dario Trevese, Fausto Vagnetti +1
We report the details of an XMM observation of the cluster of galaxies ZW 1305.4+2941 at the intermediate redshift of z=0.241, increasing the small number of interesting X-ray cons…
An X-ray Survey in SA 57 with XMM-Newton
D. Trevese, F. Vagnetti, S. Puccetti +3
The maximum number density of Active Galactic Nuclei (AGNs), as deduced from X-ray studies, occurs at z<~1, with lower luminosity objects peaking at smaller redshifts. Optical stud…
Line and continuum variability of two intermediate-redshift, high-luminosity quasars
D. Trevese, D. Paris, G. M. Stirpe +2
It has been shown that the luminosity of AGNs and the size of their broad line region obey a simple relation of the type R=a L^g, from faint Seyfert nuclei to bright quasars, allow…