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edge: the emergence of dwarf galaxy scaling relations from cosmological radiation-hydrodynamics simulations

Rey, Martin P. LU ; Taylor, Ethan ; Gray, Emily I. ; Kim, Stacy Y. ; Andersson, Eric P. LU ; Pontzen, Andrew ; Agertz, Oscar LU ; Read, Justin I. ; Cadiou, Corentin LU orcid and Yates, Robert M. , et al. (2025) In Monthly Notices of the Royal Astronomical Society 541(2). p.1195-1217
Abstract

We present a new suite of edge ('Engineering Dwarfs at Galaxy formation's Edge') cosmological zoom simulations. The suite includes 15 radiation-hydrodynamical dwarf galaxies covering the ultrafaint to the dwarf irregular regime () to enable comparisons with observed scaling relations. Each object in the suite is evolved at high resolution () and includes stellar radiation, winds, and supernova feedback channels. We compare with previous edge simulations without radiation, finding that radiative feedback results in significantly weaker galactic outflows. This generalizes our previous findings to a wide mass range, and reveals that the effect is most significant at low. Despite this difference, stellar masses stay within a factor of two... (More)

We present a new suite of edge ('Engineering Dwarfs at Galaxy formation's Edge') cosmological zoom simulations. The suite includes 15 radiation-hydrodynamical dwarf galaxies covering the ultrafaint to the dwarf irregular regime () to enable comparisons with observed scaling relations. Each object in the suite is evolved at high resolution () and includes stellar radiation, winds, and supernova feedback channels. We compare with previous edge simulations without radiation, finding that radiative feedback results in significantly weaker galactic outflows. This generalizes our previous findings to a wide mass range, and reveals that the effect is most significant at low. Despite this difference, stellar masses stay within a factor of two of each other, and key scaling relations of dwarf galaxies (size-mass, neutral gas-stellar mass, and gas-phase mass-metallicity) emerge correctly in both simulation suites. Only the stellar mass-stellar metallicity relation is strongly sensitive to the change in feedback. This highlights how obtaining statistical samples of dwarf galaxy stellar abundances with next-generation spectrographs will be key to probing and constraining the baryon cycle of dwarf galaxies.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
galaxies: dwarf, galaxies: evolution, galaxies: ISM, galaxies: structure, methods: numerical
in
Monthly Notices of the Royal Astronomical Society
volume
541
issue
2
pages
23 pages
publisher
Oxford University Press
external identifiers
  • scopus:105010847698
ISSN
0035-8711
DOI
10.1093/mnras/staf1058
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2025 The Author(s).
id
c5238a2d-9c40-45ee-8832-507db13e5f42
date added to LUP
2025-12-02 16:08:41
date last changed
2025-12-02 16:09:59
@article{c5238a2d-9c40-45ee-8832-507db13e5f42,
  abstract     = {{<p>We present a new suite of edge ('Engineering Dwarfs at Galaxy formation's Edge') cosmological zoom simulations. The suite includes 15 radiation-hydrodynamical dwarf galaxies covering the ultrafaint to the dwarf irregular regime () to enable comparisons with observed scaling relations. Each object in the suite is evolved at high resolution () and includes stellar radiation, winds, and supernova feedback channels. We compare with previous edge simulations without radiation, finding that radiative feedback results in significantly weaker galactic outflows. This generalizes our previous findings to a wide mass range, and reveals that the effect is most significant at low. Despite this difference, stellar masses stay within a factor of two of each other, and key scaling relations of dwarf galaxies (size-mass, neutral gas-stellar mass, and gas-phase mass-metallicity) emerge correctly in both simulation suites. Only the stellar mass-stellar metallicity relation is strongly sensitive to the change in feedback. This highlights how obtaining statistical samples of dwarf galaxy stellar abundances with next-generation spectrographs will be key to probing and constraining the baryon cycle of dwarf galaxies.</p>}},
  author       = {{Rey, Martin P. and Taylor, Ethan and Gray, Emily I. and Kim, Stacy Y. and Andersson, Eric P. and Pontzen, Andrew and Agertz, Oscar and Read, Justin I. and Cadiou, Corentin and Yates, Robert M. and Orkney, Matthew D.A. and Scholte, Dirk and Saintonge, Amélie and Breneman, Joseph and Mcquinn, Kristen B.W. and Muni, Claudia and Das, Payel}},
  issn         = {{0035-8711}},
  keywords     = {{galaxies: dwarf; galaxies: evolution; galaxies: ISM; galaxies: structure; methods: numerical}},
  language     = {{eng}},
  month        = {{08}},
  number       = {{2}},
  pages        = {{1195--1217}},
  publisher    = {{Oxford University Press}},
  series       = {{Monthly Notices of the Royal Astronomical Society}},
  title        = {{edge: the emergence of dwarf galaxy scaling relations from cosmological radiation-hydrodynamics simulations}},
  url          = {{http://dx.doi.org/10.1093/mnras/staf1058}},
  doi          = {{10.1093/mnras/staf1058}},
  volume       = {{541}},
  year         = {{2025}},
}