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| Paper: |
Shocks as a Secondary Source of Ionization in Diffuse Ionized Gas Halos |
| Volume: |
240, Gas and Galaxy Evolution: A Conference in Honor of the 20th Anniversary of the VLA |
| Page: |
392 |
| Authors: |
Collins, J. A.; Rand, R. J. |
| Abstract: |
Using spectroscopic data for the edge-on spiral NGC 5775, discussed in a paper by Rand in these proceedings, we attempt to address the issue of how Diffuse Ionized Gas (DIG) halos are energized. Data are interpreted in the context of composite photo-ionization/shock models. We find that an increasing contribution from shocks with z is necessary to explain observed line ratios. In addition, the runs of [oiii]/Hα vs. z in NGC 5775 suggest that shocks make a greater contribution in regions where DIG is of a filamentary morphology. |
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