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The X-ray properties of z>6 quasars: no evident evolution of accretion physics in the first Gyr of the Universe
Astronomy and Astrophysics
X-ray emission from QSOs has been used to assess SMBH accretion properties up to z 6. However, at z>6 only 15 QSOs are covered by sensitive X-ray observations, preventing a statistically significant investigation of the X-ray properties of QSOs in the first Gyr of the Universe. We present new Chandra observations of 10 z>6 QSOs, selected to have virial black-hole mass estimates from Mg II line spectroscopy. Adding archival X-ray data for an additional 15 z>6 QSOs, we investigate the X-raydoi:10.1051/0004-6361/201936217 fatcat:o6nkx3a57nhd5f3lfcgqmbjyse