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Unconventional AGN in hard X-ray surveys
A. Comastri, M. Brusa, M. Mignoli +1
Extensive programs of follow-up observations of hard X-ray selected sources have unambiguosly revealed that the sources of the X-ray background are characterized by an extremely la…
Extremely Red Objects: an X-ray dichotomy
M. Brusa, A. Comastri, E. Daddi +3
We analyze the X-ray properties of a near-infrared selected (Ks < 20) sample of spectroscopically identified Extremely Red Objects (R-Ks>5) in a region of the Chandra Deep Field-So…
The K20 survey. IV. The redshift distribution of Ks<20 galaxies: a test of galaxy formation models
A. Cimatti, L. Pozzetti, M. Mignoli +11
We present the redshift distribution of a complete sample of 480 galaxies with Ks<20 distributed over two independent fields covering a total area of 52 arcmin^2. The redshift comp…
The K20 survey. III. Photometric and spectroscopic properties of the sample
A. Cimatti, M. Mignoli, E. Daddi +12
The K20 survey is an ESO VLT optical and near-infrared spectroscopic survey aimed at obtaining spectral information and redshifts of a complete sample of about 550 objects to K_s\l…
On the nature of X-ray Bright Optically Normal galaxies
A. Comastri, M. Brusa, P. Ciliegi +10
Multiwavelength observations of the hard X-ray selected sources by Chandra and XMM-Newton surveys have significantly improved our knowledge of the objects responsible of the hard X…
The HELLAS2XMM survey: II. Multiwavelength observations of P3: an X-ray bright, optically inactive galaxy
A. Comastri, M. Mignoli, P. Ciliegi +11
Recent X-ray surveys have clearly demonstrated that a population of optically dull, X-ray bright galaxies is emerging at 2-10 keV fluxes of the order of 10^{-14} erg cm^{-2} s^{-1}…