3D core kinematics of NGC 6362: central rotation in a dynamically evolved globular cluster

3D core kinematics of NGC 6362: central rotation in a dynamically evolved globular cluster
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NGC 6362 的 3D 核心运动学:动态演化的球状星团中的中心旋转

DOI:
10.1093/mnras/stab1257
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发表时间:
2021
影响因子:
4.8
通讯作者:
Beccari, Giacomo
Beccari, Giacomo
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Dalessandro, Emanuele;Raso, Silvia;Kamann, Sebastian;Bellazzini, Michele;Vesperini, Enrico;Bellini, Andrea;Beccari, Giacomo

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本文对低质量动态演化的球状星团NGC 6362的中心区域(R< 30角秒)进行了详细的三维运动学分析。这项研究是根据欧洲南方天文台-甚大望远镜/MUSE与自适应光学模块结合使用所获得的数据进行的,并提供了3000万个视线径向速度,这些速度已被哈勃空间望远镜自行补充。数据的质量和可用的径向速度的数量使我们能够第一次检测到一个显著的旋转信号,沿着星系团核心的视线,振幅为10.1 km s-1,峰值位于距离星系团中心仅10.20 arcsec处,仅相当于星系团半光半径的。这一结果进一步支持的检测的中心和显着的切向各向异性的集群最里面的区域。这是迄今为止在GC中观察到的最中心的旋转信号之一。我们还探讨了这个集群托管的多个人口的旋转特性,并发现富钠恒星旋转速度约为2倍,比钠穷人的子人口,从而表明,目前的GC属性的解释需要一个多组分的化学动力学方法。由于长期的动力学演化和与银河系的相互作用,系统的旋转幅度和峰值位置都定性地符合理论预期。然而,为了更定量地匹配观测结果,还需要进一步的理论研究来探索团簇的初始动力学性质。
We present a detailed 3D kinematic analysis of the central regions (R< 30 arcsec) of the low mass and dynamically evolved galactic globular cluster (GC) NGC 6362. The study is based on data obtained with ESO-VLT/MUSE used in combination with the adaptive optics module and providing ∼3000 line-of-sight radial velocities, which have been complemented withHubble Space Telescopeproper motions. The quality of the data and the number of available radial velocities allowed us to detect for the first time a significant rotation signal along the line of sight in the cluster core with amplitude of ∼1 km s−1and with a peak located at only ∼20 arcsec from the cluster centre, corresponding to onlyof the cluster half-light radius. This result is further supported by the detection of a central and significant tangential anisotropy in the cluster innermost regions. This is one of the most central rotation signals ever observed in a GC to date. We also explore the rotational properties of the multiple populations hosted by this cluster and find that Na-rich stars rotate about two times more rapidly than the Na-poor sub-population thus suggesting that the interpretation of the present-day GC properties require a multicomponent chemo-dynamical approach. Both the rotation amplitude and peak position would fit qualitatively the theoretical expectations for a system that lost a significant fraction of its original mass because of the long-term dynamical evolution and interaction with the Galaxy. However, to match the observations more quantitatively further theoretical studies to explore the initial dynamical properties of the cluster are needed.
使用 GALEX 分析银河系球状星团的紫外特性
DOI: --
发表时间: 2013
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发表时间: 2016
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DOI: 10.1093/mnras/stx549
发表时间: 2017-03
影响因子: 4.8
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D. Massari;D. Massari;A. Mucciarelli;E. Dalessandro;M. Bellazzini;S. Cassisi;Giuliana Fiorentino;R. Ibata;C. Lardo;M. Salaris
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DOI: 10.1088/0004-6256/135/5/1731
发表时间: 2008
期刊: The Astronomical Journal
影响因子: --
作者:
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