Foreground dust and gas and the extinction curve of the Large Magellanic Cloud

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmic Dust, Interstellar Extinction, Interstellar Gas, Magellanic Clouds, Emission Spectra, Infrared Astronomy Satellite, Infrared Cirrus (Astronomy), Interstellar Matter

Scientific paper

The large-scale distributions of Galactic infrared and H I emission toward the Magellanic Clouds were compared, resulting in estimates of the infrared foreground of the Clouds. The Galactic gas-to-dust ratio by mass was found to be 420 (+250, -120) is found. From H I maps, maps were derived of the Galactic foreground color excess toward the Magellanic Clouds on scales of 48 arcmin. Over the LMC surface, the foreground reddening is not constant; it ranges from E(B - V) = 0.07 to 0.17 mag. For the SMC, a foreground reddening E(B - V) = 0.07 to 0.09 mag is found. The amplitude of foreground reddening variations is probably much greater on smaller scales. Toward the 30 Doradus region, the mean foreground reddening is quite low. As a result, differences between the 30 Doradus and the average LMC extinction curves are much less than previously suggested.

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