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arXiv 2202.04548astro-ph.GA
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前进和后退:Palomar 5潮汐尾的动力学

Forward and Back: Kinematics of the Palomar 5 Tidal Tails

Pete B. Kuzma, Annette M. N. Ferguson, Anna Lisa Varri, Michael J. Irwin, Edouard J. Bernard, Eline Tolstoy, Jorge Peñarrubia, Daniel B. Zucker

摘要:

帕洛玛5号(Palomar 5)的潮汐尾一直是许多光谱研究的焦点,试图识别沿着潮汐流的单个恒星并确定它们的运动学。研究充分的拖尾已经被探索到距离星团中心15^ \text{o}的地方,而沿着前导尾的距离不到4度。在本文中,我们提出了两个领域的光谱研究的结果,我们已经观察到的AAOmega摄谱仪上的英澳望远镜的领先的尾巴。其中一个磁场大约位于7^ \text{o}的前尾,超出了以前光谱学研究的范围。结合我们的测量的运动学和线强度与泛STARRS 1测光数据和盖亚EDR 3天体测量,我们采用概率的方法来确定16颗恒星属于高概率的105流。这些恒星中有八颗位于最外层,它们的天空位置证实了在主臂中存在“扇形”。我们还重新审视了以前发表的径向速度研究,并将盖亚EDR 3天体测量法用于去除干涉场恒星。通过109个{ \it bona fide} Pal 5星系团和潮汐流恒星的最终样本,我们描述了该系统整个范围内的3D运动学特征。我们为将来的建模工作提供此目录。

英文摘要:

The tidal tails of Palomar 5 (Pal 5) have been the focus of many spectroscopic studies in an attempt to identify individual stars lying along the stream and characterise their kinematics. The well-studied trailing tail has been explored out to a distance of 15^\text{o} from the cluster centre, while less than four degrees have been examined along the leading tail. In this paper, we present results of a spectroscopic study of two fields along the leading tail that we have observed with the AAOmega spectrograph on the Anglo-Australian telescope. One of these fields lies roughly 7^\text{o} along the leading tail, beyond what has been previously been explored spectroscopically. Combining our measurements of kinematics and line strengths with Pan-STARRS1 photometric data and Gaia EDR3 astrometry, we adopt a probabilistic approach to identify 16 stars with high probability of belonging to the Pal 5 stream. Eight of these stars lie in the outermost field and their sky positions confirm the presence of ``fanning'' in the leading arm. We also revisit previously-published radial velocity studies and incorporate Gaia EDR3 astrometry to remove interloping field stars. With a final sample of 109 {\it bona fide} Pal 5 cluster and tidal stream stars, we characterise the 3D kinematics along the the full extent of the system. We provide this catalogue for future modeling work.

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。

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