2 papers
astro-ph2003
X-rays from the Dawn of the Modern Universe. Chandra and XMM-Newton Observations of z>4 Quasars
C. Vignali, W. N. Brandt, D. P. Schneider
Quasars at z>4 provide direct information on the first massive structures to form in the Universe. Recent ground-based optical surveys (e.g., the Sloan Digital Sky Survey) have dis…
astro-ph2003
X-raying Active Galaxies Found and Missed by the Sloan Digital Sky Survey
W. N. Brandt, D. P. Schneider, C. Vignali
Current X-ray observatories, archival X-ray data, and the Sloan Digital Sky Survey (SDSS) represent a powerful combination for addressing key questions about active galactic nuclei…