Measurements of He I λ5876 Recombination Line Radiation from the Diffuse, Warm Ionized Medium in Irregular Galaxies

Details Measurements of He I λ5876 Recombination Line Radiation from the Diffuse, Warm Ionized Medium in Irregular Galaxies Measurements of He I λ5876 Recombination Line Radiation from the Diffuse, Warm Ionized Medium in Irregular Galaxies

1997-02-14

arxiv.org/abs/astro-ph/9702123v1

Astronomy and Astrophysics

Astrophysics

Scheduled for publication in the July 10, 1997 Astrophysical Journal. 20 Pages LaTeX including 3 postscript figures

Scientific paper

10.1086/304277

We report measurements of He I 5876 emission from the ionized gas outside the HII regions in three Magellanic irregular galaxies. The mean reddening-corrected He I / H-alpha intensity ratio is 0.041 independent of spatial location within each galaxy. This value is much higher than that measured in the warm ionized medium of the Milky Way and implies the DIG is ionized by radiation harder than that from a 40,000 K star.

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