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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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