Free Access

Fig. 6.


Emission lines in the spectrum of NGC 4513: Hα and the [NII] doublet (left) and the BPT-diagram for the southern tip of the ring (right). At the BPT-diagram the known boundaries between HII-region excitation type and the others are plotted: the green dashed line is a theoretical boundary by Kewley et al. (2001), and the dotted red line is an empirical star-formation sequence from Kauffmann et al. (2003). We have plotted separately the inner edge of the ring, R = 71.5″ (upper dot), and the outer edge of the ring, R = 76.5″ (lower dot). The whole (integrated) ring is shown by a black star.

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.