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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…
A Chandra observation of the z=2.285 galaxy FSC10214+4724: Evidence for a Compton-thick quasar?
D. M. Alexander, G. Chartas, F. E. Bauer +3
We present a ~20 ks Chandra ACIS-S observation of the strongly lensed z=2.285 ultra-luminous infrared galaxy FSC10214+4724. Although this observation achieves the equivalent sensit…
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…
High-redshift QSOs in the GOODS
S. Cristiani, D. M. Alexander, F. Bauer +15
The Great Observatories Origins Deep Survey provides significant constraints on the space density of less luminous QSOs at high redshift, which is particularly important to underst…
Fact: Many SCUBA galaxies harbour AGNs
D. M. Alexander, F. E. Bauer, S. C. Chapman +4
Deep SCUBA surveys have uncovered a large population of ultra-luminous galaxies at z>1. These sources are often assumed to be starburst galaxies, but there is growing evidence that…