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Fig. 9

image

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.

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