M83极端外缘盘的近期星形成
天体物理学
2009-11-10 v1
摘要
使用Galaxy Evolution Explorer (GALEX)的紫外成像揭示了M83极端外缘盘中大量紫外亮星际复合体，径向延伸至HII区域主要检测半径(R_HII = 5.1'或6.6 kpc)的约4倍处。这些源通常与M83扭曲外缘盘中的大尺度HI结构相关联，分布在分子ISM尚未检测到的 galactocentric 半径处。我们测量了这些星际复合体的性质，包括FUV和NUV 星 magnitudes 以及局部气体面积密度。只有部分外缘盘紫外源在H-alpha 成像中检测到相应的HII区域，这与包含混合年龄的样本相符，其中一些源年龄仅为几百万年，而另一些则年龄约为10^8年。
引用
@article{arxiv.astro-ph/0411306,
title = {Recent Star Formation in the Extreme Outer Disk of M83},
author = {D. A. Thilker and L. Bianchi and S. Boissier and A. Gil de Paz and B. F. Madore and C. Martin and G. R. Meurer and S. G. Neff and M. Rich and D. Schiminovich and M. Seibert and T. K. Wyder and T. A. Barlow and Y. Byun and J. Donas and K. Forster and P. G. Friedman and T. M. Heckman and P. N. Jelinsky and Y. Lee and R. F. Malina and B. Milliard and P. Morrissey and O. H. W. Siegmund and T. Small and A. S. Szalay and B. Y. Welsh},
journal= {arXiv preprint arXiv:astro-ph/0411306},
year = {2009}
}
备注
This paper will be published as part of the Galaxy Evolution Explorer (GALEX) Astrophysical Journal Letters Special Issue. Links to the full set of papers will be available at http://www.galex.caltech.edu/PUBLICATIONS/ after November 22, 2004