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arXiv 2602.15940astro-ph.GAastro-ph.CO
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AS1063中暗物质和球状星团的大核心。可能自相互作用暗物质的证据?或不是

The large cores of dark matter and globular clusters in AS1063. Possible evidence of self-interacting dark matter. Or not

Instituto de Física de Cantabria (CSIC-UC)(坎塔布里亚物理研究所(CSIC-UC))

Jose M. Diego

AI总结:

AS1063星系团中球状星团与暗物质的大核心分布可能暗示自相互作用暗物质的存在,但需进一步高分辨率模拟验证。

摘要:

深空JWST图像揭示了AS1063星系团中成千上万个球状星团。当与基于相同JWST数据的引力透镜模型进行比较时,球状星团的分布紧密地追踪了引力透镜质量(主要由暗物质组成)的分布。有趣的是,暗物质和球状星团的分布都有较大的中心核心。然而,球状星团分布中的核心大小大约是暗物质分布核心大小的一半。我们论证标准冷暗物质和模糊暗物质模型难以解释这些大核心。同时,具有速度依赖交叉截面的自相互作用暗物质,结合核心停滞,如果对于星系团晕有σ_SI≈0.3 cm²/g⁻¹,则能自然解释这些核心的存在。但我们还讨论了缺乏能够解析星系团尺度晕中球状星团的流体动力学N体模拟,阻碍了排除标准非碰撞暗物质情景的可能性。未来高分辨率的星系团流体动力学模拟,包含数万亿粒子,并包含上万个球状星团,可以提供必要的洞察,将暗物质的认知性质转变为本体性质。

英文摘要:

Deep JWST images of AS1063 reveals tens of thousands of globular clusters in the galaxy cluster AS1063. When compared with the lensing model based on the same JWST data, the distribution of globular clusters traces closely the distribution of lensing mass (mostly composed of dark matter). Interestingly, both the distributions of dark matter and globular clusters have large central cores. However the size of the core in the distribution of globular clusters is about half the size the core of the dark matter distribution. We argue that the standard cold dark matter and fuzzy dark matter models struggle to explain these large cores. Meanwhile, the self interacting dark matter with a velocity dependent cross section, combined with core stalling, offers a natural explanation to the existence of these cores if $σ_{\rm SI}\approx 0.3$ cm$^2$ g$^{-1}$ for galaxy cluster halos. But we also discuss how the lack of hydrodynamical N-body simulations capable of resolving globular clusters in galaxy cluster scale halos, hinders the possibility of ruling out the standard non-collisional dark matter scenario. Future high-resolution hydrodynamical simulations of galaxy clusters, with several trillion particles, and containing over a hundred thousand globular clusters, can provide the insight needed to transform the epistemic nature of dark matter into an ontological one

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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