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
中科院分区:
文献类型:
--
作者:
Dalessandro, Emanuele;Raso, Silvia;Kamann, Sebastian;Bellazzini, Michele;Vesperini, Enrico;Bellini, Andrea;Beccari, Giacomo
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.
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DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
E. Dalessandro;F. Ferraro;R. Schiavon;S. Sohn;B. Lanzoni;R. O’Connell
通讯作者:
R. O’Connell
DOI:
10.3847/2041-8213/ab45f7
发表时间:
2019-10
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
E. Dalessandro;M. Cadelano;E. Vesperini;S. Martocchia;F. Ferraro;B. Lanzoni;N. Bastian;J. Hong;N. Sanna
通讯作者:
E. Dalessandro;M. Cadelano;E. Vesperini;S. Martocchia;F. Ferraro;B. Lanzoni;N. Bastian;J. Hong;N. Sanna
DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
T. Husser;S. Kamann;S. Dreizler;M. Wendt;Nina Wulff;R. Bacon;L. Wisotzki;J. Brinchmann;P. Weilbacher;M. Roth;A. Monreal
通讯作者:
A. Monreal
影响因子:
4.8
作者:
D. Massari;D. Massari;A. Mucciarelli;E. Dalessandro;M. Bellazzini;S. Cassisi;Giuliana Fiorentino;R. Ibata;C. Lardo;M. Salaris
通讯作者:
D. Massari;D. Massari;A. Mucciarelli;E. Dalessandro;M. Bellazzini;S. Cassisi;Giuliana Fiorentino;R. Ibata;C. Lardo;M. Salaris
DOI:
10.1088/0004-6256/135/5/1731
发表时间:
2008
期刊:
The Astronomical Journal
影响因子:
--
作者:
Sidney van den Bergh
通讯作者:
Sidney van den Bergh