Up: AGNs with composite spectra
Previous: Seyfert 2s and Liners
We have shown that:
- Nuclear H II regions, Seyfert 2s and Liners lie in distinct, well
separated regions in the log(5007/H) vs. log(6583/ )
and log(5007/H) vs. log(6300/H) diagrams. There is no continuity
between Liners and Seyfert 2s, with an apparent deficit of objects with
63005007 = 0.25.
- A number of objects have ``transition'' spectra, falling outside the
regions assigned to the three types of emission nebulosities. They probably
all have a ``composite'' spectrum.
- We have isolated a class of Seyfert 2 galaxies with weak [N II] lines.
This weakness could be due to an under-abundance of nitrogen or to the
presence of matter-bounded clouds in these objects.