Free Access

Fig. 1

thumbnail

The BPT (Baldwin et al. 1981) diagnostic diagram used to classify the spectra of galaxies in this work, based on the [Nii]/Hα and [Oiii]/Hβ line ratios. Objects for which a measurement of [Oiii]/Hβ is not available are plotted at log([Oiii]/Hβ) = −1.3. The Decarli et al. (2007) scheme (straight dashed lines) marks the classification boundaries between star-forming, LINER, Seyfert and composite/transition galaxies. In addition, the demarcation line between star-forming and AGN-host galaxies from Kauffmann et al. (2003, solid black line) is shown. Potential AGN-host galaxies (red open circles) are thus removed from the sample of normal star-forming systems (blue closed circles).

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.