Journal article
Boosting galactic outflows with enhanced resolution
- Abstract:
- We study how better resolving the cooling length of galactic outflows affect their energetics. We perform radiativehydrodynamical galaxy formation simulations of an isolated dwarf galaxy (M = 108 M) with the RAMSES-RTZ code, accounting for non-equilibrium cooling and chemistry coupled to radiative transfer. Our simulations reach a spatial resolution of 18 pc in the interstellar medium (ISM) using a traditional quasi-Lagrangian scheme. We further implement a new adaptive mesh refinement strategy to resolve the local gas cooling length, allowing us to gradually increase the resolution in the stellar-feedback-powered outflows, from ≥ 200 pc to 18 pc. The propagation of outflows into the inner circumgalactic medium is significantly modified by this additional resolution, but the ISM, star formation, and feedback remain by and large the same. With increasing resolution in the diffuse gas, the hot outflowing phase (T > 8 × 104 K) systematically reaches overall higher temperatures and stays hotter for longer as it propagates outwards. This leads to two-fold increases in the time-averaged mass and metal outflow loading factors away from the galaxy (r = 5 kpc), a five-fold increase in the average energy loading factor, and a ≈50 per cent increase in the number of sightlines with NO VI ≥ 1013 cm−2. Such a significant boost to the energetics of outflows without new feedback mechanisms or channels strongly motivates future studies quantifying the efficiency with which better-resolved multiphase outflows regulate galactic star formation in a cosmological context.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 4.0MB, Terms of use)
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- Publisher copy:
- 10.1093/mnras/stae388
Authors
+ Science and Technology Facilities Council
More from this funder
- Grant:
- ST/P002293/1
- ST/R002371/1
- ST/S002502/1
- ST/K000373/1
- Programme:
- BIS National E-Infrastructure
- Publisher:
- Oxford University Press
- Journal:
- Monthly Notices of the Royal Astronomical Society More from this journal
- Volume:
- 528
- Issue:
- 3
- Pages:
- 5412-5431
- Publication date:
- 2024-02-07
- Acceptance date:
- 2024-02-02
- DOI:
- EISSN:
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1365-2966
- ISSN:
-
0035-8711
- Language:
-
English
- Keywords:
- Pubs id:
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1619890
- Local pid:
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pubs:1619890
- Deposit date:
-
2024-04-25
Terms of use
- Copyright holder:
- Rey et al.
- Copyright date:
- 2024
- Rights statement:
- © The Author(s) 2024. Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
- Notes:
-
For the purpose of Open Access, the author has applied a CC BY public copyright
licence to any Author Accepted Manuscript version arising from this submission.
- Licence:
- CC Attribution (CC BY)
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