Cosmic Reionization on Computers: Baryonic Effects on Halo Concentrations during the Epoch of Reionization
Baryons both increase halo concentration through adiabatic contraction and expel mass through feedback processes. However, it is not well understood how the radiation fields prevalent during the epoch of reionization affect the evolution of concentration in dark matter halos. We investigate how bary...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2023-01-01
|
| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/aca1b3 |
| _version_ | 1797701477872959488 |
|---|---|
| author | Hanjue Zhu Nickolay Y. Gnedin |
| author_facet | Hanjue Zhu Nickolay Y. Gnedin |
| author_sort | Hanjue Zhu |
| collection | DOAJ |
| description | Baryons both increase halo concentration through adiabatic contraction and expel mass through feedback processes. However, it is not well understood how the radiation fields prevalent during the epoch of reionization affect the evolution of concentration in dark matter halos. We investigate how baryonic physics during the epoch of reionization modify the structure of dark matter halos in the Cosmic Reionization On Computers (CROC) simulations. We use two different measures of halo concentration to quantify the effects. We compare concentrations of halos matched between full-physics simulations and dark-matter-only simulations with identical initial conditions between 5 ≤ z ≤ 9. Baryons in full-physics simulations do pull matter toward the center, increasing the maximum circular velocity compared to dark-matter-only simulations. However, their overall effects are much less than if all the baryons were simply centrally concentrated indicating that heating processes efficiently counteract cooling effects. Finally, we show that the baryonic effects on halo concentrations at z ≈ 5 are relatively insensitive to environmental variations of reionization history. These results are pertinent to models of galaxy–halo connection during the epoch of reionization. |
| first_indexed | 2024-03-12T04:36:17Z |
| format | Article |
| id | doaj.art-acf395666cd249e888cdf5f0d44dc511 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T04:36:17Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-acf395666cd249e888cdf5f0d44dc5112023-09-03T09:55:28ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0194215210.3847/1538-4357/aca1b3Cosmic Reionization on Computers: Baryonic Effects on Halo Concentrations during the Epoch of ReionizationHanjue Zhu0https://orcid.org/0000-0003-0861-0922Nickolay Y. Gnedin1https://orcid.org/0000-0001-5925-4580Department of Astronomy & Astrophysics; The University of Chicago ; Chicago, IL 60637, USA ; hanjuezhu@uchicago.eduDepartment of Astronomy & Astrophysics; The University of Chicago ; Chicago, IL 60637, USA ; hanjuezhu@uchicago.edu; Particle Astrophysics Center; Fermi National Accelerator Laboratory; Batavia, IL 60510, USA; Kavli Institute for Cosmological Physics; The University of Chicago ; Chicago, IL 60637, USABaryons both increase halo concentration through adiabatic contraction and expel mass through feedback processes. However, it is not well understood how the radiation fields prevalent during the epoch of reionization affect the evolution of concentration in dark matter halos. We investigate how baryonic physics during the epoch of reionization modify the structure of dark matter halos in the Cosmic Reionization On Computers (CROC) simulations. We use two different measures of halo concentration to quantify the effects. We compare concentrations of halos matched between full-physics simulations and dark-matter-only simulations with identical initial conditions between 5 ≤ z ≤ 9. Baryons in full-physics simulations do pull matter toward the center, increasing the maximum circular velocity compared to dark-matter-only simulations. However, their overall effects are much less than if all the baryons were simply centrally concentrated indicating that heating processes efficiently counteract cooling effects. Finally, we show that the baryonic effects on halo concentrations at z ≈ 5 are relatively insensitive to environmental variations of reionization history. These results are pertinent to models of galaxy–halo connection during the epoch of reionization.https://doi.org/10.3847/1538-4357/aca1b3ReionizationGalaxy formation |
| spellingShingle | Hanjue Zhu Nickolay Y. Gnedin Cosmic Reionization on Computers: Baryonic Effects on Halo Concentrations during the Epoch of Reionization The Astrophysical Journal Reionization Galaxy formation |
| title | Cosmic Reionization on Computers: Baryonic Effects on Halo Concentrations during the Epoch of Reionization |
| title_full | Cosmic Reionization on Computers: Baryonic Effects on Halo Concentrations during the Epoch of Reionization |
| title_fullStr | Cosmic Reionization on Computers: Baryonic Effects on Halo Concentrations during the Epoch of Reionization |
| title_full_unstemmed | Cosmic Reionization on Computers: Baryonic Effects on Halo Concentrations during the Epoch of Reionization |
| title_short | Cosmic Reionization on Computers: Baryonic Effects on Halo Concentrations during the Epoch of Reionization |
| title_sort | cosmic reionization on computers baryonic effects on halo concentrations during the epoch of reionization |
| topic | Reionization Galaxy formation |
| url | https://doi.org/10.3847/1538-4357/aca1b3 |
| work_keys_str_mv | AT hanjuezhu cosmicreionizationoncomputersbaryoniceffectsonhaloconcentrationsduringtheepochofreionization AT nickolayygnedin cosmicreionizationoncomputersbaryoniceffectsonhaloconcentrationsduringtheepochofreionization |