UVOT Measurements of Dust and Star Formation in the SMC and M33
Lea M. Z. Hagen, Michael H. Siegel, Caryl A. Gronwall, Erik A., Hoversten, Angelica Vargas, Stefan Immler
TL;DR
This study uses UVOT data to measure dust extinction curves and recent star formation histories in the SMC and M33, highlighting variability in dust properties and improving star formation rate corrections.
Contribution
It provides new measurements of dust extinction curves and detailed star formation histories for the SMC and M33 using UVOT observations.
Findings
Variability in the dust extinction curve slopes
Differences in the 2175 Angstrom bump strength
Detailed recent star formation histories derived
Abstract
When measuring star formation rates using ultraviolet light, correcting for dust extinction is a critical step. However, with the variety of dust extinction curves to choose from, the extinction correction is quite uncertain. Here, we use Swift/UVOT to measure the extinction curve for star-forming regions in the SMC and M33. We find that both the slope of the curve and the strength of the 2175 Angstrom bump vary across both galaxies. In addition, as part of our modeling, we derive a detailed recent star formation history for each galaxy.
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