M83的中心区域：大质量恒星的形成，运动学，以及核心的位置和起源
The central region of M83: Massive star formation, kinematics, and the location and origin of the nucleus
摘要：
我们报告新的近红外积分场光谱的中央星暴区域的棒旋星系M83获得与CIRPASS双子座-S，我们分析结合GHaFaS法布里-珀罗数据，AAT IRIS 2 KS波段图像，近和中红外成像的哈勃和斯皮策太空望远镜。目前的恒星形成活动的大部分被尘埃消光从光学视野中隐藏起来，但可以在核北部的近红外和中红外看到。这一区域由通过M83棒的气体流入提供，由从北部进入环核区域的突出尘埃带追踪。对恒星年龄的分析证实，最年轻的恒星确实在西北部。逐渐的年龄梯度，较老的恒星在更南边，是M83中心区域著名的恒星形成弧的特征。对Pa β电离气体运动学和近红外成像的详细分析证实，运动学中心与M83的光度中心重合，并且这些中心与星系的可见核有大约3角秒或60 pc的明显偏移。我们讨论了两种可能的选择，其中第一个假设的运动学和光度中心跟踪隐藏的大量的尘埃消光的星系核，在A_V=3-10马格的范围内。通过结合这些信息与运动学的结果，并使用从文献中的参数，我们得出结论，这样的情况是，然而，不太可能的，因为是存在的其他“隐藏”的核在M83。因此，我们同意最近的作者，并赞成第二种选择，其中星系的核心是从它的运动和光度中心偏移。这大概是过去某些相互作用的结果，可能与星系外盘扰动起源的事件有关。（节录）
英文摘要：
We report new near-IR integral field spectroscopy of the central starburst region of the barred spiral galaxy M83 obtained with CIRPASS on Gemini-S, which we analyse in conjunction with GHaFaS Fabry-Perot data, an AAT IRIS2 Ks-band image, and near- and mid-IR imaging from the Hubble and Spitzer space telescopes. The bulk of the current star formation activity is hidden from optical view by dust extinction, but is seen in the near- and mid-IR to the north of the nucleus. This region is being fed by inflow of gas through the bar of M83, traced by the prominent dust lane entering into the circumnuclear region from the north. An analysis of stellar ages confirms that the youngest stars are indeed in the northwest. A gradual age gradient, with older stars further to the south, characterises the well-known star-forming arc in the central region of M83. Detailed analyses of the Pa beta ionised gas kinematics and near-IR imaging confirm that the kinematic centre coincides with the photometric centre of M83, and that these are offset significantly, by about 3 arcsec or 60 pc, from the visible nucleus of the galaxy. We discuss two possible options, the first of which postulates that the kinematic and photometric centre traces a galaxy nucleus hidden by a substantial amount of dust extinction, in the range A_V=3-10 mag. By combining this information with kinematic results and using arguments from the literature, we conclude that such a scenario is, however, unlikely, as is the existence of other "hidden" nuclei in M83. We thus concur with recent authors and favour a second option, in which the nucleus of the galaxy is offset from its kinematic and photometric centre. This is presumably a result of some past interaction, possibly related to the event which lies at the origin of the disturbance of the outer disk of the galaxy. (Abridged)
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