arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0801.1213astro-ph
收藏

M83中部地区

The Central Region of M83

R. C. W. Houghton, N. Thatte

摘要:

我们将VLT/ISAAC近红外光谱与存档的HST/WFPC 2和HST/NICMOS成像相结合,以研究M83的中心20“x20”。我们的近红外指数在环核星爆区域的集群是不一致的简单的瞬时爆发模型。然而,一个单一的爆发分散在一个持续时间为600万年的模型很好地拟合数据,并提供了最清晰的证据,沿着恒星形成弧的年龄梯度,最年轻的集群最接近东北尘埃带。长缝运动学没有证据支持先前关于第二个隐藏质量浓度的说法,尽管我们确实观察到了与尘埃带边缘激波存在一致的分子气体速度变化。

英文摘要:

We combine VLT/ISAAC NIR spectroscopy with archival HST/WFPC2 and HST/NICMOS imaging to study the central 20"x20" of M83. Our NIR indices for clusters in the circumnuclear star-burst region are inconsistent with simple instantaneous burst models. However, models of a single burst dispersed over a duration of 6 Myrs fit the data well and provide the clearest evidence yet of an age gradient along the star forming arc, with the youngest clusters nearest the north-east dust lane. The long slit kinematics show no evidence to support previous claims of a second hidden mass concentration, although we do observe changes in molecular gas velocity consistent with the presence of a shock at the edge of the dust lane.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑