Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21546308c&link_type=abstract
American Astronomical Society, AAS Meeting #215, #463.08; Bulletin of the American Astronomical Society, Vol. 42, p.495
Astronomy and Astrophysics
Astronomy
Scientific paper
The availability of multiple narrow-band images targeting hydrogen recombination lines (H-beta, H-alpha, P-beta), across a wide range of the electromagnetic spectrum, with the newly commissioned Wide Field Camera 3 on the Hubble Space Telescope enables, for the first time, the measurement of dust extinction and of the extinction-free luminosity function of compact HII regions in the nearby starburst galaxy M83. At a distance of 4.5 Mpc, the angular resolution (2 pixels) of the UVIS camera on WFC3 corresponds to a linear scale of 1.7 parsec, and the resolution of the IR camera to 5.7 parsec. With these resolutions, HII regions ionized by single stars can be separated from those ionized by stellar clusters. The availability of multi-wavelength hydrogen emission lines also enables a crude analysis of the dust geometry in the regions. This paper is based on Early Release Science observations made by the WFC3 Scientific Oversight Committee. We are grateful to the Director of the Space Telescope Science Institute for awarding Director's Discretionary time for this program.
Calzetti Daniela
Chandar Rupali
Hong Seung Sae
Liu Gaisheng
WFC3 SOC Team
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