V.J. McIntyre, PASA, 15 (1), 157
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Neutral and ionised hydrogen in NGCá 4214
V.J. McIntyre 
Physics Dept. University of Wollongong, Wollongong NSWá 2522, AUSTRALIA
Astrophysics Dept. Sydney University, Sydney NSWá 2006
vjm@physics.usyd.edu.au
Abstract:
It is not clear at present how the diffuse ionized gas (DIG) component in galaxies is ionized. The leading hypothesis is that ultraviolet photons from star clusters are responsible, but this requires a rather porous interstellar medium if the photons are to travel the large distances (
1á kpc) between the bright clusters and diffuse-emission regions. To examine this hypothesis, we present high-resolution VLA observations of the neutral hydrogen in the Magellanic galaxy NGCá 4214, and compare them with an H
image. The data appear consistent with the idea that enough UV photons escape from supergiant Há II regions to ionise the DIG.
Keywords: ISM: bubbles galaxies: star clusters galaxies: individual (NGCá 4214)
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