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arXiv 1302.1497astro-ph.CO
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M101中星团的运动学

Kinematics of Star Clusters in M101

Lesley Simanton, Rupali Chandar, Bryan Miller

摘要:

我们已经从哈勃太空望远镜(HST)的多波段图像中识别出了附近晚型螺旋星系M101中的几千个星团,其中包括大约90个候选的古老球状星团(GC)。我们获得了后续的低分辨率(R约2000)光学光谱从Gemini-GMOS的43个总的集群,其中18个是老GC和25个是年轻的大质量集群(YMC)。我们测量这些集群的径向速度,并发现,正如预期的那样,YMC旋转HI磁盘。旧的GC没有显示出任何明显的自转证据,并且比YMC有更高的速度色散,这表明M101中的GC可能是恒星晕或厚盘的一部分。

英文摘要:

We have identified a few thousand star clusters in the nearby, late-type spiral galaxy M101, including approximately 90 candidate ancient globular clusters (GCs), from multi-band Hubble Space Telescope (HST) images. We obtained follow-up low-resolution (R approximately 2000) optical spectroscopy from Gemini-GMOS for 43 total clusters, of which 18 are old GCs and 25 are young massive clusters (YMCs). We measure radial velocities for these clusters and find that, as expected, the YMCs rotate with the HI disk. The old GCs do not show any obvious evidence for rotation and have a much higher velocity dispersion than the YMCs, suggesting that the GCs in M101 are likely part of a stellar halo or thick disk.

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