Neutral and ionised hydrogen in NGC 4214

Details Neutral and ionised hydrogen in NGC 4214 Neutral and ionised hydrogen in NGC 4214

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasa...15..157m&link_type=abstract

Publications Astronomical Society of Australia, vol. 15, no. 1, p. 157-58

Astronomy and Astrophysics

Astronomy

6

Interstellar Medium, Bubbles, Star Clusters, Individual (Ngc 4214)

Scientific paper

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 (greater than 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 H-alpha image. The data appear consistent with the idea that enough UV photons escape from supergiant HII regions to ionise the DIG.

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