Recent star formation in the extreme outer disk of M83



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Gil de Paz, Armando and otros, ... (2005) Recent star formation in the extreme outer disk of M83. Astrophysical journal, 619 (1). L79-L82. ISSN 0004-637X

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Ultraviolet imaging with the Galaxy Evolution Explorer (GALEX) has revealed an extensive sample of UV-bright stellar complexes in the extreme outer disk of M83, extending to about 4 times the radius at which the majority of H II regions are detected (R_H II = 5´.1, or 6.6 kpc). These sources are typically associated with large-scale filamentary H I structures in the warped outer disk of M83 and are distributed beyond the galactocentric radii at which molecular interstellar medium has yet been detected. We present measured properties of these stellar complexes, including far-UV and near-UV magnitudes and local gas surface density. Only a subset of the outer-disk UV sources have corresponding H II regions detected in Hα imaging, consistent with a sample of mixed age in which some sources are a few megayears old and others are much more evolved (~10^8 yr).

Item Type:Article
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© 2005. The American Astronomical Society. All rights reserved. Artículo firmado por 27 autores. GALEX (Galaxy Evolution Explorer) is a NASA Small Explorer, launched in 2003 April. We gratefully acknowledge NASA’s support for construction, operation, and science analysis for the GALEX mission, developed in cooperation with the Centre National d’Etudes Spatiales of France and the Korean Ministry of Science and Technology.

Uncontrolled Keywords:Galactic disks; Molecular gas; NGC-5236 M83; Young stars; Galaxies; Regions
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:36010
Deposited On:29 Feb 2016 16:09
Last Modified:10 Dec 2018 15:05

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