Chandra and XMM-Newton observations of the first quasars: X-rays from the age of cosmic enlightenment

C. Vignali, W. N. Brandt, D. P. Schneider +6

We report on Chandra and XMM-Newton observations of a sample of 13 quasars at z~4.7-5.4 mostly taken from the Sloan Digital Sky Survey (SDSS). The present sample complements previo…