arXiv 2510.021302025-10astro-ph.GAastro-ph.CO

原位球状星团在替代暗物质银河系中的研究：对模糊暗物质和核心状暗物质理论的初步探索

In-situ globular clusters in alternative dark matter Milky Way galaxies: a first approach to fuzzy and core-like dark matter theories

LIRA, Observatoire de Paris, Université PSL, Sorbonne Université, Université Paris Cité, CY Cergy Paris Université, CNRS（拉格朗日天体物理实验室，巴黎天文台，巴黎文理研究大学，索邦大学，巴黎西岱大学，塞吉-蓬图瓦兹大学，法国国家科学研究中心）

Pierre Boldrini, Paola Di Matteo

备注：: 14 pages, 9 figures. Accepted by A&A
发表信息：: A&A 708, A261 (2026)
DOI：: 10.1051/0004-6361/202557703

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AI总结：

研究通过模拟分析原位球状星团在模糊暗物质银河系中的动力学，探讨不同暗物质模型对星团分布和性质的影响，发现暗物质质量影响星团形成特性，为未来欧几里得任务提供观测约束。

摘要：

我们首次分析了在模糊暗物质（FDM）晕中嵌套的银河系（MW）类星系中原位球状星团（GCs）的动力学，结合TNG50模拟的宇宙组装历史与专用轨道积分和解析模型。GC种群在匹配的CDM和FDM晕中以相同的归一化E-Lz分布初始化。在以FDM为主导的宇宙中，我们识别出三种不同的原位GC种群模式，取决于粒子质量m22≡m_χ/10^{-22} eV。对于m22<7，物质主导内势场，保持陡峭和中心集中的特性，限制GC轨道到狭窄区域，产生质量更小、更紧凑的系统。对于m22≈7，GC特性与CDM相似，质量与空间分布相似。对于m22>7，暗物质变得紧凑且全球主导，产生更深且更扩展的引力势能，支持更宽范围的稳定GC轨道，产生更高质量和空间扩展的GC系统。最后，我们扩展框架以预测MW类和矮星系中其他暗物质模型（如暖暗物质和自相互作用暗物质）的GC种群。我们的发现表明，原位GC系统为暗物质物理提供了敏感且独立的探测手段，为未来欧几里得任务提供新的观测约束。

英文摘要：

We present a first analysis of the dynamics of in-situ globular clusters (GCs) in Milky Way (MW)-like galaxies embedded in fuzzy dark matter (FDM) halos, combining cosmological assembly histories from the TNG50 simulation with dedicated orbital integrations and analytical models. GC populations are initialized with identical distributions in normalized $E$-$L_{z}$ in matched CDM and FDM halos. In a universe dominated by FDM, we identify three distinct regimes for the in-situ GC population depending on the particle mass $m_{22} \equiv m_χ/ 10^{-22}~\mathrm{eV}$. For $m_{22} < 7$, baryons dominate the inner potential, which remains steep and centrally concentrated, confining GC orbits to a narrow region and producing less massive, more compact systems than in CDM. For $m_{22} \sim 7$, GC properties resemble those in CDM, with similar mass and spatial distributions. For $m_{22} > 7$, the dark matter becomes both compact and globally dominant, generating a deeper and more extended gravitational potential that supports a wider range of stable GC orbits, resulting in more massive and spatially extended GC systems. Finally, we extend our framework to make predictions for GC populations in alternative DM models, including warm dark matter and self-interacting dark matter, in both MW-like and dwarf galaxies. Our findings demonstrate that in-situ GC systems offer a sensitive and independent probe of the underlying DM physics, opening new avenues for observational constraints with upcoming Euclid.

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