Revised optical classification of a sample of gamma-ray-emitting active galactic nuclei with GTC and VLT

Open Access

Fig. 2.

FWHM(Hβ_broad)–R₄₅₇₀ plane that defines the quasar MS. Pop. A and B are shown, together with their finer subdivisions. Shaded regions indicate the areas populated by quasars, with the color intensity representing the source density in each region. The pink points represent the objects in the current sample for which the FWHM(Hβ_broad) and R₄₅₇₀ were measured.

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