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Neutral and Ionised Hydrogen in NGC 4214

Published online by Cambridge University Press:  16 May 2016

V. J. McIntyre
V. J. McIntyre*
Affiliation:
Physics Department, University of Wollongong, Wollongong, NSW 2522, Australia Astrophysics Department, University of Sydney, NSW 2006, Australia; [email protected]
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Abstract

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It is not clear at present how the diffuse ionised gas (DIG) component in galaxies is ionised. 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 (≥ 1 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 NGC 4214, and compare them with an Hα image. The data appear consistent with the idea that enough UV photons escape from supergiant H II regions to ionise the DIG.

Keywords

ISM: bubblesgalaxies: star clustersgalaxies: individual (NGC 4214)
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 15 , Issue 1 , 1998 , pp. 157 - 158
Copyright
Copyright © Astronomical Society of Australia 1998

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