Reddening law and interstellar dust properties along Magellanic sight-lines
Frederic Zagury
TL;DR
This paper demonstrates that the extinction curves in the SMC, LMC, and Milky Way follow a unified law based on the 2200A bump and a single parameter, indicating similar dust properties across these galaxies.
Contribution
It generalizes the Cardelli, Clayton, and Mathis (1989) extinction law to include SMC, LMC, and Milky Way, showing their dust properties are fundamentally similar.
Findings
Extinction curves obey a common law dependent on the 2200A bump and one parameter.
Linear reddening laws are applicable across the visible/UV spectrum in all three galaxies.
Extinction in SMC, LMC, and Milky Way is of the same nature.
Abstract
This study establishes that SMC, LMC and Milky Way extinction curves obey the same extinction law which depends on the 2200A bump size and one parameter, and generalizes the Cardelli, Clayton and Mathis (1989) relationship. This suggests that extinction in all three galaxies is of the same nature. The role of linear reddening laws over all the visible/UV wavelength range, particularly important in the SMC but also present in the LMC and in the Milky Way, is also highlighted and discussed.
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