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arXiv 2601.02466astro-ph.CO
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冷暗物质和暖暗物质 paradigm 的一个挑战

A possible challenge for Cold and Warm Dark Matter

Max Planck Institute for Astrophysics(马克斯·普朗克天体物理研究所);Kapteyn Astronomical Institute, University of Groningen(格罗宁根大学卡佩恩天文研究所);South African Radio Astronomy Observatory(南非射电天文台);Department of Physics, University of Pretoria(比勒陀利亚大学物理系);Istituto di Radioastronomia, INAF(INAF射电天文研究所);Osservatorio di Astrofisica e Scienza dello Spazio, INAF(INAF天体物理学与空间科学观测站);Dipartimento di Fisica e Astronomia, Alma Mater Studiorum Università di Bologna(博洛尼亚大学物理与天文学系);Sezione di Bologna, INFN(INFN博洛尼部分部);Department of Physics and Astronomy, University of California Davis(加州大学戴维斯分校物理与天文学系)

S. Vegetti, S. D. M. White, J. P. McKean, D. M. Powell, C. Spingola, D. Massari, G. Despali, C. D. Fassnacht

AI总结:

该研究通过引力透镜发现了一个可能由自相互作用暗物质构成的天体,其结构与冷暗物质模型不兼容,可能对暗物质理论产生重大影响。

摘要:

测量暗物质晕的密度分布和质量集中度是检验标准冷暗物质范式的关键测试。此类对象是黑暗的,因此难以表征,但可以通过引力透镜进行研究。最近,一个一百万太阳质量的天体被发现叠加在延伸且极薄的引力弧上。本文报告了对这一天体质量密度分布和红移的各种假设的广泛测试。我们发现最能描述数据的模型包含两个组成部分:一个未解析的点质量,半径小于等于10 pc,位于一个延伸的质量分布中心,该分布在截断半径139 pc内具有几乎恒定的表面密度。这些特性不相似于任何已知的天体。然而,如果该天体由暗物质主导,其结构与冷暗物质模型不兼容,但可能与自相互作用暗物质晕相容,其中中心区域已坍缩形成黑洞。该检测可能对当前暗物质的理解产生重大影响。

英文摘要:

Measuring the density profile and mass concentration of dark-matter haloes is a key test of the standard cold dark matter paradigm. Such objects are dark and thus challenging to characterise, but they can be studied via gravitational lensing. Recently, a million-solar-mass object was discovered superposed on an extended and extremely thin gravitational arc. Here we report on extensive tests of various assumptions for the mass density profile and redshift of this object. We find models that best describe the data have two components: an unresolved point-mass of radius $\leq10$ pc centred on an extended mass distribution with an almost constant surface density out to a truncation radius of 139 pc. These properties do not resemble any known astronomical object. However, if the object is dark matter-dominated, its structure is incompatible with cold dark matter models, but may be compatible with a self-interacting dark matter halo where the central region has collapsed to form a black hole. This detection could thus carry substantial implications for our current understanding of dark matter.

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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