Comparison between mean optical (R filter) luminosities of the analyzed BL Lac objects and their averaged optical colors ⟨ B − R ⟩ (see Table 3). In the diagram, the color-coding denotes the Pearson’s correlation coefficient of the optical CM relation, C(B − R,R), as depicted in the stripe below the panel. Different symbols here are used to denote three different types of BL Lac objects included in the sample, namely HBLs (circles), LBLs (triangles), and LBLs (stars). The error bars are evaluated as described in Sect. 2.4.
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.