Fig. 2

Background-substracted LETGS ± 1 0.1−10 keV spectrum of Ark 564. Extrapolation of the best-fit hard power law to low energies to demonstrate the soft excess. The upper panel shows the data with the convolved model in red (black and white [BW] as a solid line). Below, the ratio data/model.
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.