Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21812924d&link_type=abstract
American Astronomical Society, AAS Meeting #218, #129.24; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Scheduled for launch in summer 2011, the Interstellar Medium Absorption Gradient Experiment Rocket (IMAGER) will probe the correlation between ultraviolet dust extinction, and the metallicity and radiation environment in M101. IMAGER simultaneously images M101 in four 400Å-wide bandpasses, targeting UV extinction features. We present technical results from telescope and instrument calibration and integration, as well as expected science results from the unique IMAGER design.
With nearly face-on orientation, large angular extent, a steep metallicity gradient, and many well-studied HII regions, M101 is an ideal laboratory for the study of dust near regions of massive star formation. 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 measure the apparent strength of the 2175Å bump, the far-UV rise, and the UV continuum. IMAGER observations, infrared data from Spitzer, the DIRTY radiative transfer model, and stellar evolution models allow us to examine the morphology in the UV extinction curve and the 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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