Minimum star-forming halo mass in axion cosmology
Minimum star-forming halo mass in axion cosmology
复制标题
轴子宇宙学中的最小恒星形成晕质量
DOI：
10.1093/mnrasl/sly164
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发表时间：
2018
影响因子：
--
通讯作者：
Bromm Volker
中科院分区：
文献类型：
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作者：
Sullivan James M;Hirano Shingo;Bromm Volker
阐明暗物质的粒子物理本质是现代科学面临的重大挑战之一。目前在实验室中缺乏任何直接的DM探测，这就增加了对天体物理约束的需求，将搜索范围扩展到DM模型，超越了流行的弱相互作用大质量粒子场景。在这里，我们适用于经典的里斯Ostriker丝绸冷却标准的星系形成的模型与超轻轴子DM，也被称为模糊暗物质（FDM）。由此产生的约束条件提供了一个启发式的框架，为即将到来的观察，我们的近似分析激励需要未来的FDM结构形成的自洽模拟。我们使用观测约束DM主机的超暗矮（UFD）星系的本地组，连同红移约束的发病的原始星星形成从最近的EDGES 21厘米宇宙学测量，来说明这种方法。我们发现，现有的限制是直接与标准的ΛCDM，但不利于FDM轴子质量以下。利用DM粒子物理的天体物理探测器的未来潜力是引人注目的。
Elucidating the particle physics nature of dark matter (DM) is one of the great challenges in modern science. The current lack of any direct DM detections in the laboratory heightens the need for astrophysical constraints, extending the search to DM models beyond the popular weakly interacting massive particle scenario. We here apply the classical Rees–Ostriker–Silk cooling criterion for galaxy formation to models with ultralight axion DM, also known as fuzzy dark matter (FDM). The resulting constraints provide a heuristic framework for upcoming observations, and our approximate analysis motivates the need for future self-consistent simulations of FDM structure formation. We use observational constraints for the DM hosts of ultra-faint dwarf (UFD) galaxies in the Local Group, together with the redshift constraints for the onset of primordial star formation from the recent EDGES 21-cm cosmology measurement, to illustrate this approach. We find that the existing constraints are straightforward to reconcile with standard ΛCDM, but disfavour FDM axion masses below. The future potential for harnessing astrophysical probes of DM particle physics is compelling.