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The Chandra Deep Field South: Optical Spectroscopy I
G. P. Szokoly, J. Bergeron, G. Hasinger +15
We present the results of our spectroscopic follow-up program of the X-ray sources detected in the 942 ks exposure of the Chandra Deep Field South (CDFS). 288 possible counterparts…
Local Supermassive Black Holes, Relics of Active Galactic Nuclei and the X-ray Background
A. Marconi, G. Risaliti, R. Gilli +3
We quantify the importance of mass accretion during AGN phases in the growth of supermassive black holes (BH) by comparing the mass function of black holes in the local universe wi…
The nuclear SED of NGC6251: a BL Lac in the center of an FR I radio galaxy
Marco Chiaberge, Roberto Gilli, Alessandro Capetti +1
We determine the nuclear spectral energy distribution (SED) from the radio to the gamma-ray band for the FR I radio galaxy NGC6251, by using both data from the literature and analy…
Elusive Active Galactic Nuclei
R. Maiolino, A. Comastri, R. Gilli +8
A fraction of active galactic nuclei do not show the classical Seyfert-type signatures in their optical spectra, i.e. they are optically "elusive". X-ray observations are an optima…
Tracing the large scale structure in the Chandra Deep Field South
R. Gilli, A. Cimatti, E. Daddi +16
We report the discovery of large scale structures of X-ray sources in the 1Msec observation of the Chandra Deep Field South. Two main structures appear as narrow (Delta_z < 0.02) s…
The X-ray background and the deep X-ray surveys
R. Gilli
The deep X-ray surveys performed by the two major X-ray observatories on flight, Chandra and XMM, are being resolving the bulk of the cosmic X-ray background (XRB) in the 2-10 keV…