Free Access

Fig. 1


Distribution of blazars in the sky in Galactic coordinates (Aitoff projection), superimposed to the LAB absorption map, representing the distribution of Galactic column densities (see Kalberla et al. 2005, for further details). Black stars represent the high-z Silver sample. As black diamonds, blazars of the low-z sample.

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.