Free Access

Fig. 9


Comparison between the HE γ-ray photon indices for the LAT-detected sources in the sample and their optical luminosities. The color-coding denotes the Pearson’s correlation coefficient of the optical CM relation, C(BR,R), as depicted in the stripe below the diagram. Different symbols here are used to denote three types of BL Lac objects included in the sample: HBLs (circles), LBLs (triangles), and LBLs (stars). The error bars for LR are evaluated as described in Sect. 2.4. The error bars for the Fermi-LAT spectral indices are taken from 2FGL.

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.