arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1303.0290astro-ph.CO
收藏

致密群中的星系相互作用I:HCG16的星系风

Galaxy Interactions in Compact Groups I : The Galactic Winds of HCG16

Frédéric P. A. Vogt, Michael A. Dopita, Lisa J. Kewley

摘要:

利用WiFeS积分场摄谱仪,我们对致密星系群中的恒星形成星系进行了一系列观测。在致力于该项目的第一篇论文中,我们介绍了螺旋星系NGC838,希克森致密群16的成员,及其星系风的分析。我们的观测显示,恒星风形成了一个不对称的、两极的、旋转的结构,由核恒星暴提供动力。发射线比诊断表明,光电离是占主导地位的激发机制在风的基础。来自慢激波的混合(高达20%)沿着外流轴进一步增加。风的不对称性很可能是由风泡的两个叶中的一个从HI包络中破裂出来引起的,如线比和径向速度图所示。这种星系风的特征表明,它是早期(几百万年)风的演变序列。这种风也与伙伴星系NGC839中的星系风有很大的不同,后者包含对称的激波激发风。假设这两个星系有相似的相互作用历史,这两种不同的风一定是NGC838和NGC839的内在性质和它们的星爆的结果。

英文摘要:

Using the WiFeS integral field spectrograph, we have undertaken a series of observations of star-forming galaxies in Compact Groups. In this first paper dedicated to the project, we present the analysis of the spiral galaxy NGC838, a member of the Hickson Compact Group 16, and of its galactic wind. Our observations reveal that the wind forms an asymmetric, bipolar, rotating structure, powered by a nuclear starburst. Emission line ratio diagnostics indicate that photoionization is the dominant excitation mechanism at the base of the wind. Mixing from slow shocks (up to 20%) increases further out along the outflow axis. The asymmetry of the wind is most likely caused by one of the two lobes of the wind bubble bursting out of its HI envelope, as indicated by line ratios and radial velocity maps. The characteristics of this galactic wind suggest that it is caught early (a few Myr) in the wind evolution sequence. The wind is also quite different to the galactic wind in the partner galaxy NGC839 which contains a symmetric, shock-excited wind. Assuming that both galaxies have similar interaction histories, the two different winds must be a consequence of the intrinsic properties of NGC838 and NGC839 and their starbursts.

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。

↑