Physical Evolution of Dark Matter Halo around the Depletion Boundary
We investigate the buildup of the halo profile out to large scale in a cosmological simulation, focusing on the roles played by the recently proposed depletion radii. We explicitly show that halo growth is accompanied by the depletion of the environment, with the inner depletion radius demarcating t...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acdfcd |
| _version_ | 1797698098565218304 |
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| author | Hongyu Gao Jiaxin Han Matthew Fong Y. P. Jing Zhaozhou Li |
| author_facet | Hongyu Gao Jiaxin Han Matthew Fong Y. P. Jing Zhaozhou Li |
| author_sort | Hongyu Gao |
| collection | DOAJ |
| description | We investigate the buildup of the halo profile out to large scale in a cosmological simulation, focusing on the roles played by the recently proposed depletion radii. We explicitly show that halo growth is accompanied by the depletion of the environment, with the inner depletion radius demarcating the two. This evolution process is also observed via the formation of a trough in the bias profile, with the two depletion radii identifying key scales in the evolution. The ratio between the inner depletion radius and the virial radius is approximately a constant factor of 2 across redshifts and halo masses. The ratio between their enclosed densities is also close to a constant of 0.18. These simple scaling relations reflect the largely universal scaled mass profile on these scales, which only evolves weakly with redshift. The overall picture of the boundary evolution can be broadly divided into three stages according to the maturity of the depletion process, with cluster halos lagging behind low-mass ones in the evolution. We also show that the traditional slow and fast accretion dichotomy of halo growth can be identified as accelerated and decelerated depletion phases, respectively. |
| first_indexed | 2024-03-12T03:49:22Z |
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| id | doaj.art-4bdccea575ff4fd0925f2bb336e0d6f5 |
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| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T03:49:22Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-4bdccea575ff4fd0925f2bb336e0d6f52023-09-03T12:29:28ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0195313710.3847/1538-4357/acdfcdPhysical Evolution of Dark Matter Halo around the Depletion BoundaryHongyu Gao0Jiaxin Han1https://orcid.org/0000-0002-8010-6715Matthew Fong2Y. P. Jing3https://orcid.org/0000-0002-4534-3125Zhaozhou Li4https://orcid.org/0000-0001-7890-4964Department of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University , Shanghai, 200240, People's Republic of China jiaxin.han@sjtu.edu.cn; Key Laboratory for Particle Astrophysics and Cosmology (MOE) , Shanghai 200240, People's Republic of China; Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University , Shanghai, 200240, People's Republic of ChinaDepartment of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University , Shanghai, 200240, People's Republic of China jiaxin.han@sjtu.edu.cn; Key Laboratory for Particle Astrophysics and Cosmology (MOE) , Shanghai 200240, People's Republic of China; Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University , Shanghai, 200240, People's Republic of ChinaDepartment of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University , Shanghai, 200240, People's Republic of China jiaxin.han@sjtu.edu.cn; Key Laboratory for Particle Astrophysics and Cosmology (MOE) , Shanghai 200240, People's Republic of China; Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University , Shanghai, 200240, People's Republic of ChinaDepartment of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University , Shanghai, 200240, People's Republic of China jiaxin.han@sjtu.edu.cn; Key Laboratory for Particle Astrophysics and Cosmology (MOE) , Shanghai 200240, People's Republic of China; Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University , Shanghai, 200240, People's Republic of China; Tsung-Dao Lee Institute, Shanghai Jiao Tong University , Shanghai, 200240, People's Republic of ChinaCentre for Astrophysics and Planetary Science, Racah Institute of Physics, The Hebrew University , Jerusalem, 91904, IsraelWe investigate the buildup of the halo profile out to large scale in a cosmological simulation, focusing on the roles played by the recently proposed depletion radii. We explicitly show that halo growth is accompanied by the depletion of the environment, with the inner depletion radius demarcating the two. This evolution process is also observed via the formation of a trough in the bias profile, with the two depletion radii identifying key scales in the evolution. The ratio between the inner depletion radius and the virial radius is approximately a constant factor of 2 across redshifts and halo masses. The ratio between their enclosed densities is also close to a constant of 0.18. These simple scaling relations reflect the largely universal scaled mass profile on these scales, which only evolves weakly with redshift. The overall picture of the boundary evolution can be broadly divided into three stages according to the maturity of the depletion process, with cluster halos lagging behind low-mass ones in the evolution. We also show that the traditional slow and fast accretion dichotomy of halo growth can be identified as accelerated and decelerated depletion phases, respectively.https://doi.org/10.3847/1538-4357/acdfcdDark matterGalaxy dark matter halosLarge-scale structure of the universeN-body simulations |
| spellingShingle | Hongyu Gao Jiaxin Han Matthew Fong Y. P. Jing Zhaozhou Li Physical Evolution of Dark Matter Halo around the Depletion Boundary The Astrophysical Journal Dark matter Galaxy dark matter halos Large-scale structure of the universe N-body simulations |
| title | Physical Evolution of Dark Matter Halo around the Depletion Boundary |
| title_full | Physical Evolution of Dark Matter Halo around the Depletion Boundary |
| title_fullStr | Physical Evolution of Dark Matter Halo around the Depletion Boundary |
| title_full_unstemmed | Physical Evolution of Dark Matter Halo around the Depletion Boundary |
| title_short | Physical Evolution of Dark Matter Halo around the Depletion Boundary |
| title_sort | physical evolution of dark matter halo around the depletion boundary |
| topic | Dark matter Galaxy dark matter halos Large-scale structure of the universe N-body simulations |
| url | https://doi.org/10.3847/1538-4357/acdfcd |
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