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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2507.00410 |
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| _version_ | 1866915762984189952 |
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| author | Shields, Tristen Salazar, Edgar M. Rozo, Eduardo Adya, Aakanksha Osinga, Calvin Vladimir, Ze'ev |
| author_facet | Shields, Tristen Salazar, Edgar M. Rozo, Eduardo Adya, Aakanksha Osinga, Calvin Vladimir, Ze'ev |
| contents | Among the most fundamental properties of a dark matter halo is its density profile. Motivated by the recent proposal by García et al. [R. García et. al., MNRAS 521, 2464 (2023)] to define a dynamical halo as the collection of orbiting particles in a gravitationally bound structure, we characterize the mean and scatter of the orbiting profile of dynamical halos as a function of their orbiting mass. We demonstrate that the orbiting profile of individual halos at fixed mass depends on a single dynamical variable -- the halo radius $r_{\rm h}$ -- which characterizes the spatial extent of the profile. The scatter in halo radius at fixed orbiting mass is $\approx 16\%$. Only a small fraction of this scatter arises due to differences in halo formation time, with late-forming halos being more compact (smaller halo radii). Accounting for this additional correlation results in an $\approx 11\%$ scatter in halo radius at fixed mass and halo formation time. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_00410 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Density Profile of Dynamical Halos Shields, Tristen Salazar, Edgar M. Rozo, Eduardo Adya, Aakanksha Osinga, Calvin Vladimir, Ze'ev Cosmology and Nongalactic Astrophysics Among the most fundamental properties of a dark matter halo is its density profile. Motivated by the recent proposal by García et al. [R. García et. al., MNRAS 521, 2464 (2023)] to define a dynamical halo as the collection of orbiting particles in a gravitationally bound structure, we characterize the mean and scatter of the orbiting profile of dynamical halos as a function of their orbiting mass. We demonstrate that the orbiting profile of individual halos at fixed mass depends on a single dynamical variable -- the halo radius $r_{\rm h}$ -- which characterizes the spatial extent of the profile. The scatter in halo radius at fixed orbiting mass is $\approx 16\%$. Only a small fraction of this scatter arises due to differences in halo formation time, with late-forming halos being more compact (smaller halo radii). Accounting for this additional correlation results in an $\approx 11\%$ scatter in halo radius at fixed mass and halo formation time. |
| title | The Density Profile of Dynamical Halos |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2507.00410 |