The role of ultraviolet imaging in studies of resolved and unresolved young stellar populations. M31 and M33 |
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Authors: | Luciana Bianchi Yongbeom Kang Paul Hodge Julianne Dalcanton Benjamin Williams |
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Institution: | 1. Department of Physics and Astronomy, The Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA;2. Department of Astronomy and Space Science, Chungnam University, 220 Gun-dong, Daejeon 3-5-764, South Korea;3. Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, USA |
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Abstract: | We discuss the relevance of UV data in the detection and characterization of hot massive stars and young stellar populations in galaxies. We show results from recent extensive surveys in M31 and M33 with Hubble Space Telescope (HST) multi-wavelength data including UV filters, which imaged several regions at a linear resolution (projected) of less than half a pc in these galaxies, and from GALEX far-UV and near-UV wide-field, low-resolution imaging of the entire galaxies. Both datasets allow us to study the hierarchical structure of star formation: the youngest stellar groups are the most compact, and are often arranged within broader, sparser structures. The derived recent star-formation rates are rather similar for the two galaxies, when scaled for the respective areas. We show how uncertainties in metallicity and type of selective extinction for the internal reddening may affect the results, and how an appropriate complement of UV filters could reduce such uncertainties, and significantly alleviate some parameter degeneracies. |
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Keywords: | Ultraviolet: imaging Stars: massive stars Stars: stellar parameters Galaxies: star formation Galaxies: M31 M33 Ultraviolet: galaxies |
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