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ニシミチ タカヒロ
NISHIMICHI TAKAHIRO
西道 啓博 所属 京都産業大学 理学部 宇宙物理・気象学科 職種 准教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2025/03 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | Inner structure of cold and warm dark matter halos from particle dynamics |
| 執筆形態 | 共著 |
| 掲載誌名 | Publications of the Astronomical Society of Japan |
| 掲載区分 | 国外 |
| 巻・号・頁 | 77(2),pp.337-355 |
| 著者・共著者 | Yohsuke Enomoto,Atsushi Taruya,Satoshi Tanaka,Takahiro Nishimichi |
| 概要 | Using the number of apocenter passages $p$ and the radial action $J_r$ of
each particle, we characterize the phase-space structure within the multi-stream regions of cold and warm dark matter halos in cosmological $N$-body simulations. Building on previous work by Enomoto et al. (2024), we analyze the radial density profiles of particles classified by $p$ and $J_r$. We find that the profiles consistently follow a double power-law structure, independent of the dark matter model or halo mass. The inner profile exhibits a $\rho \propto r^{-1}$ behavior, which is consistent with previous studies. Notably, this characteristics persist across both classification schemes. In contrast, the outer power-law profiles display distinct behaviors depending on the classification. While particles classified by $p$ exhibit a steeper slope, ranging from $-6$ to $-8$, those classified by $J_r$ follow a common slope of approximately $-3.5$. Overall, the amplitude of the double power-law profiles varies between simulations for different dark matter models, but this variation can be attributed to statistical differences in the concentration of halos across the models. |
| DOI | 10.1093/pasj/psaf00 |
| PermalinkURL | http://arxiv.org/abs/2410.00195v2 |
| researchmap用URL | http://arxiv.org/pdf/2410.00195v2 |