Fig. 4.

Upper panel: Dn(4000) spectroscopic index vs. concentration index Cr for WATCAT sources (green diamonds), FRICAT sources (black dots), and FRIICAT sources (red squares). It appears that WATs are hosted in red early-type galaxies, as FR Is are, while high-excitation FR IIs show lower values of Dn(4000). Lower panel: concentration index Cr vs. black hole mass (in solar units). WATs show a similar behavior to FR Is, while FR IIs extend to lower black hole masses with respect to the WATCAT sample, probably due to relatively large errors particularly in the measurement of σ*, a possible uncertain identification of their spectroscopic class, or a substantial contribution from a bright nonthermal nucleus.
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.