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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2512.03132 |
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| _version_ | 1866911573000323072 |
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| author | Garcia, Alex M. Rose, Jonah C. Torrey, Paul Caputo, Andrea Lisanti, Mariangela Pace, Andrew B. Liu, Hongwan Hussein, Abdelaziz Liu, Haozhe Villaescusa-Navarro, Francisco Barry, John Leisher, Ilem Costanza, Belén Kho, Jonathan Lilie, Ethan Li, Jiaxuan Ahvazi, Niusha Bhowmick, Aklant Nguyen, Tri O'Neil, Stephanie Ou, Xiaowei Shen, Xuejian Farahi, Arya Kallivayalil, Nitya Necib, Lina Vogelsberger, Mark |
| author_facet | Garcia, Alex M. Rose, Jonah C. Torrey, Paul Caputo, Andrea Lisanti, Mariangela Pace, Andrew B. Liu, Hongwan Hussein, Abdelaziz Liu, Haozhe Villaescusa-Navarro, Francisco Barry, John Leisher, Ilem Costanza, Belén Kho, Jonathan Lilie, Ethan Li, Jiaxuan Ahvazi, Niusha Bhowmick, Aklant Nguyen, Tri O'Neil, Stephanie Ou, Xiaowei Shen, Xuejian Farahi, Arya Kallivayalil, Nitya Necib, Lina Vogelsberger, Mark |
| contents | In this work, we utilize a new suite of Milky Way-mass halos from the DREAMS Project, simulated with Cold Dark Matter (CDM), to quantify the influence of baryon feedback and intrinsic halo-to-halo variance on dark matter density profiles. Our suite of 1024 halos varies over supernova and black hole feedback parameters from the IllustrisTNG model, as well as variations in two cosmological parameters. We find that, for the DREAMS parameter variations, Milky Way-mass dark matter density profiles in the IllustrisTNG model are largely insensitive to astrophysics and cosmology variations, with the dominant source of scatter instead arising from halo-to-halo variance. However, most of the (comparatively minor) feedback-driven variations come from the changes to supernova prescriptions. By comparing to dark matter-only simulations, we find that the strongest supernova wind energies are so effective at preventing galaxy formation that the halos are nearly entirely collisionless dark matter. Finally, regardless of physics variation, all the DREAMS halos are roughly consistent with a halo contracting adiabatically from the presence of baryons, unlike models that have bursty stellar feedback. This work represents a step toward assessing the uncertainty in Milky Way dark matter profiles, with direct implications for dark matter searches where systematic uncertainty in the density profile remains a major challenge. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_03132 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The DREAMS Project: Disentangling the Impact of Halo-to-Halo Variance and Baryonic Feedback on Milky Way Dark Matter Density Profiles Garcia, Alex M. Rose, Jonah C. Torrey, Paul Caputo, Andrea Lisanti, Mariangela Pace, Andrew B. Liu, Hongwan Hussein, Abdelaziz Liu, Haozhe Villaescusa-Navarro, Francisco Barry, John Leisher, Ilem Costanza, Belén Kho, Jonathan Lilie, Ethan Li, Jiaxuan Ahvazi, Niusha Bhowmick, Aklant Nguyen, Tri O'Neil, Stephanie Ou, Xiaowei Shen, Xuejian Farahi, Arya Kallivayalil, Nitya Necib, Lina Vogelsberger, Mark Astrophysics of Galaxies In this work, we utilize a new suite of Milky Way-mass halos from the DREAMS Project, simulated with Cold Dark Matter (CDM), to quantify the influence of baryon feedback and intrinsic halo-to-halo variance on dark matter density profiles. Our suite of 1024 halos varies over supernova and black hole feedback parameters from the IllustrisTNG model, as well as variations in two cosmological parameters. We find that, for the DREAMS parameter variations, Milky Way-mass dark matter density profiles in the IllustrisTNG model are largely insensitive to astrophysics and cosmology variations, with the dominant source of scatter instead arising from halo-to-halo variance. However, most of the (comparatively minor) feedback-driven variations come from the changes to supernova prescriptions. By comparing to dark matter-only simulations, we find that the strongest supernova wind energies are so effective at preventing galaxy formation that the halos are nearly entirely collisionless dark matter. Finally, regardless of physics variation, all the DREAMS halos are roughly consistent with a halo contracting adiabatically from the presence of baryons, unlike models that have bursty stellar feedback. This work represents a step toward assessing the uncertainty in Milky Way dark matter profiles, with direct implications for dark matter searches where systematic uncertainty in the density profile remains a major challenge. |
| title | The DREAMS Project: Disentangling the Impact of Halo-to-Halo Variance and Baryonic Feedback on Milky Way Dark Matter Density Profiles |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2512.03132 |