Neutral and ionised hydrogen in NGC 4214

V.J. McIntyre, PASA, 15 (1), 157
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Neutral and ionised hydrogen in NGC 4214

V.J. McIntyre tex2html_wrap_inline45

tex2html_wrap_inline47 Physics Dept. University of Wollongong, Wollongong NSW 2522, AUSTRALIA
tex2html_wrap_inline49 Astrophysics Dept. Sydney University, Sydney NSW 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 (tex2html_wrap_inline51 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 Htex2html_wrap_inline53 image. The data appear consistent with the idea that enough UV photons escape from supergiant H II regions to ionise the DIG.

Keywords: ISM: bubbles galaxies: star clusters galaxies: individual (NGC 4214)


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