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| Paper: |
Physical Conditions in Diffuse Ionized Gas Halos |
| Volume: |
230, Galaxy Disks and Disk Galaxies |
| Page: |
307 |
| Authors: |
Collins, J. A.; Rand, R. J. |
| Abstract: |
Using spectroscopic data for a selection of edge-on spiral galaxies, we attempt to address the issue of how Diffuse Ionized Gas (DIG) halos are energized. Data are interpreted in the context of a pure photo-ionization model with an increasing temperature with z. Such a model can explain the general trend of an increase in ratios of forbidden lines to Balmer lines observed in these galaxies. However, the ionization fraction of O++ indicated by the [OIII]/Hα ratio in NGC 5775 cannot be explained by such a scenario, indicating the need for an additional source of ionization. |
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