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A Catalogue of Galactic GEMS: Globular Cluster Extra-tidal Mock Stars

Monthly Notices of the Royal Astronomical Society(2024)

Univ Toronto | Univ Concepcion

Cited 0|Views18
Abstract
This work presents the Globular cluster Extra-tidal Mock Star (GEMS) catalogue of extra-tidal stars and binaries created via three-body dynamical encounters in globular cluster cores. Using the particle-spray code Corespray, we sample N=50,000 extra-tidal stars and escaped recoil binaries for 159 Galactic globular clusters. Sky positions, kinematics, stellar properties and escape information are provided for all simulated stars. Stellar orbits are integrated in seven different static and time-varying Milky Way gravitational potential models where the structure of the disc, perturbations from the Large Magellanic Cloud and the mass and sphericity of the Milky Way's dark matter halo are all investigated. We find that the action coordinates of the mock extra-tidal stars are largely Galactic model independent, where minor offsets and broadening of the distributions between models are likely due to interactions with substructure. Importantly, we also report the first evidence for stellar stream contamination by globular cluster core stars and binaries for clusters with pericentre radii larger than five kiloparsecs. Finally, we provide a quantitative tool that uses action coordinates to match field stars to host clusters with probabilities. Ultimately, combining data from the GEMS catalogue with information of observed stars will allow for association of extra-tidal field stars with any Galactic globular cluster; a requisite tool for understanding population-level dynamics and evolution of clusters in the Milky Way.
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software: simulations,stars: kinematics and dynamics,galaxies: star clusters: general,globular clusters: star clusters: individual
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要点】:该论文介绍了通过三星系统动力学作用在球状星团核心中创建的球状星团额外外延模拟星(GEMS)目录,创新点在于提出了一个工具,通过动量坐标匹配场星与宿主星团,为理解银河系中球状星团的动力学与演化提供了必要工具。

方法】:使用粒子喷射代码Corespray,对159个银河球状星团的50,000颗额外外延星体和逃离反冲双星进行了抽样。

实验】:在七种不同的静态和随时间变化的银河引力势模型中,对所有模拟星体进行了轨道积分,这些模型考虑了银河盘结构、大麦哲伦云的扰动以及银河系暗物质晕的质量和球对称性。研究发现在这些模拟的额外外延星体的动量坐标很大程度上不依赖于银河模型,且首次报告了星团核心恒星和双星对大于五千帕秒的星团径向距离的星流污染的证据。最后,提供了一个使用动量坐标匹配场星与宿主星团的量化工具,并最终可通过结合GEMS目录数据与观测恒星信息,将额外外延场星与银河系中任何球状星团联系起来。