Free Access

Fig. 7.


Hardness ratio between the 2–8 keV (hard) and 0.5–2 keV (soft) bands (i.e., X-ray hardness) as a function of redshift. The dashed lines are simulated tracks for an absorbed power-law with photon index fixed at 1.8. The red star is the X-ray hardness for GH500.30. For comparison, we also plot in gray dots the hardness ratios for SMGs in Wang et al. (2013), which include the most distant Compton-thick AGN, LESS J033229.4-275619 at z = 4.76 (red circle).

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.