Extinction of H II regions in the Large Magellanic Cloud

Astronomy and Astrophysics – Astronomy

Scientific paper

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Magellanic Clouds, H Ii Regions, Cosmic Dust, Supernova Remnants, Radio Spectra, Balmer Series, Continuous Spectra, Milky Way Galaxy, H I Regions, Radiant Flux Density

Scientific paper

The extinction properties of H II regions in the Large Magellanic Cloud are investigated using radio continuum data obtained from the Molonglo Observatory Synthesis Telescope, digitized and calibrated H-alpha data, and published Balmer decrement measurements. The resulting extinction-color excess diagram suggests that (1) most H II regions in the Magellanic Clouds have similar extinction properties to the Galactic ones, (2) all imaginable gas/dust configurations are possible, and (3) the extinction of some highly reddened H II region cores originates externally in cocoon shells. The puzzle of different extinction-color excess ratios of Galactic and extragalactic H II regions is explained as being due to the different populations of observed samples rather than any intrinsic differences. The extinction of the observed Galactic H II regions produced by foreground dust overwhelms the internal extinction, while the situation in the observed extragalactic H II regions is just the opposite.

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