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X-rays from the First Massive Black Holes
W. N. Brandt, C. Vignali, B. D. Lehmer +3
We briefly review some recent results from Chandra and XMM-Newton studies of the highest redshift (z > 4) active galactic nuclei (AGNs). Specific topics covered include radio-quiet…
The European Large Area ISO Survey VIII: 90-micron final analysis and source counts
Ph. Heraudeau, S. Oliver, C. del Burgo +17
We present a re--analysis of the European Large Area ISO Survey (ELAIS) 90mum observations carried out with ISOPHOT, an instrument on board the ESA's Infrared Space Observatory (IS…
Type II quasar candidates in the Sloan Digital Sky Survey: evidence for X-ray obscuration
C. Vignali, D. M. Alexander, A. Comastri
Recent X-ray surveys with Chandra and XMM-Newton have found several genuine Type II quasars, the long sought-after population of high-luminosity (high-redshift) Seyfert 2 galaxies,…
Obscured AGN and the X-ray, Optical and Far-Infrared Number Counts of AGN in the GOODS Fields
E. Treister, C. M. Urry, E. Chatzichristou +12
The deep X-ray, optical, and far-infrared fields that constitute GOODS are sensitive to obscured AGN (N_H>10^{22} cm^{-2}) at the quasar epoch (z~2-3), as well as to unobscured AGN…
The Fall of AGN and the Rise of Star-Forming Galaxies: A Close Look at the Chandra Deep Field X-ray Number Counts
F. E. Bauer, D. M. Alexander, W. N. Brandt +4
We investigate the X-ray number counts in the 1-2 Ms Chandra Deep Fields (CDFs) to determine the contributions of faint X-ray source populations to the extragalactic X-ray backgrou…
Evidence for X-ray Obscuration in Type II Quasar Candidates from the Sloan Digital Sky Survey
C. Vignali, D. M. Alexander, A. Comastri
Recently, Zakamska et al. (2003) selected 291 high-ionization narrow emission-line AGN in the redshift range 0.3-0.83 from the Sloan Digital Sky Survey spectroscopic data. The samp…