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Oscar Agertz. Profile photo.

Oscar Agertz

Associate Professor / Senior university lecturer / Wallenberg Academy Fellow

Oscar Agertz. Profile photo.

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

Author

  • Martin P. Rey
  • Ethan Taylor
  • Emily I. Gray
  • Stacy Y. Kim
  • Eric P. Andersson
  • Andrew Pontzen
  • Oscar Agertz
  • Justin I. Read
  • Corentin Cadiou
  • Robert M. Yates
  • Matthew D.A. Orkney
  • Dirk Scholte
  • Amélie Saintonge
  • Joseph Breneman
  • Kristen B.W. Mcquinn
  • Claudia Muni
  • Payel Das
Show all

Summary, in English

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.

Department/s

  • Astrophysics
  • Department of Physics

Publishing year

2025-08-01

Language

English

Pages

1195-1217

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

541

Issue

2

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • galaxies: dwarf
  • galaxies: evolution
  • galaxies: ISM
  • galaxies: structure
  • methods: numerical

Status

Published

ISBN/ISSN/Other

  • ISSN: 0035-8711