Free Access
Fig. 1
Top panel: distribution of the observed 0.5–2 keV flux versus redshift for the main sample of 2119 quasars (small black points) and the one of 545 sources (gold points). Bottom panel: redshift distribution for the best quasar sample.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.