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| Paper: |
The Nature of Ionized Gas in Early-type Galaxies |
| Volume: |
421, Galaxies in Isolation: Exploring Nature Versus Nurture |
| Page: |
77 |
| Authors: |
Annibali, F.; Bressan, A.; Rampazzo, R.; Zeilinger, W. W. |
| Abstract: |
We present a study of the ionized gas in a sample of 65 nearby early-type galaxies, for which we have acquired optical intermediate-resolution spectra. Emission lines are detected in ∼ 89% of the sample. The incidence of emission appears independent from the E or S0 morphological classes. According to classical diagnostic diagrams, the majority of the galaxies are LINERs. However, the galaxies tend to move toward the “Composites” region (at lower [NII]λ6584/Hα values) as the emission lines are measured at larger galacto-centric distances. This suggests that different ionization mechanisms may be at work in LINERs. |
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