Free Access

Fig. 6


Relative probability density distribution of the hardness ratio (H  −  S)/(H + S) for the high Galactic-latitude sample. The dashed line indicates the most probable value of hardness ratio, which corresponds to a power-law spectral model with Γ = 1.8, absorbed by an hydrogen column density NH = 3.3 × 1020 cm-2.

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.