Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725009d&link_type=abstract
American Astronomical Society, AAS Meeting #217, #250.09; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The Interstellar Medium Absorption Gradient Experiment Rocket (IMAGER) will probe the correlation between ultraviolet dust extinction, and the metallicity and radiation environment in M101. With four 400Å-wide bandpasses, IMAGER targets UV extinction features and will utilize M101 as a laboratory for studying dust in HII regions. M101 is nearly face-on, has large angular extent, a steep metallicity gradient, and contains many well-studied HII regions. Evidence from studies of starburst galaxies indicates that active, high mass star formation modifies the UV dust extinction curve, demonstrated by the lack of a characteristic 2175Å bump. With ultraviolet photometry from IMAGER, we will measure the apparent strength of the 2175Å bump, the far-UV rise, and the UV continuum. With this data, infrared data from Spitzer, the DIRTY radiative transfer model, and stellar evolution models, we will examine changes seen in the UV extinction curve and IR emission features as a function of metallicity and radiation field hardness. This study will directly impact our understanding of the nature of dust and our ability to accurately account for the effects of dust on observations at all redshifts.
Chakrabarti Sangeeta
Cook Theodore Andrea
Danowski Meredith E.
Gordon Karl Douglas
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