期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 491, 期 2, 页码 1656-1672出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz3053
关键词
methods: numerical; galaxies: dwarf; galaxies: evolution; galaxies: formation; galaxies: kinematics and dynamics; Local Group
资金
- Swedish Research Council [2014-5791]
- Knut and Alice Wallenberg Foundation
- Royal Society
- Perren Fund
- IMPACT fund
- ORAGE project from the Agence Nationale de la Recherche [ANR-14-CE33-0016-03]
- UCL Cosmoparticle Initiative
- BEIS capital funding via STFC capital grants [ST/K000373/1, ST/R002363/1]
- STFC DiRAC Operations grant [ST/R001014/1]
- BIS National E-infrastructure capital grant [ST/K00042X/1]
- DiRAC Operations grant [ST/K003267/1]
- Durham University
- Swiss National Supercomputing Centre (CSCS) [s890]
- Royal Physiographic Society of Lund
- STFC [ST/V002635/1, ST/T00049X/1, ST/M007618/1, ST/P000673/1, ST/J005673/1, ST/R001049/1, ST/P002447/1, ST/K000373/1, ST/M006530/1, ST/T001550/1, ST/L000636/1, ST/T001348/1, ST/T001569/1, ST/R001014/1, ST/P003400/1, ST/V002376/1, ST/M006948/1, ST/M007073/1, ST/R001006/1, ST/S003762/1, ST/M007006/1, ST/M007065/1, ST/S002529/1, ST/T001372/1, ST/R00689X/1, ST/R002363/1, ST/K00333X/1, ST/K00042X/1, ST/R000832/1, 1941677] Funding Source: UKRI
We introduce the 'Engineering Dwarfs at Galaxy Formation's Edge' (EDGE) project to study the cosmological formation and evolution of the smallest galaxies in the Universe. In this first paper, we explore the effects of resolution and sub-grid physics on a single low-mass halo (M-halo = 10(9) M-circle dot), simulated to redshift z = 0 at a mass and spatial resolution of similar to 20 M-circle dot and similar to 3 pc. We consider different star formation prescriptions, supernova feedback strengths, and on-the-fly radiative transfer (RT). We show that RT changes the mode of galactic self-regulationat this halo mass, suppressing star formation by causing the interstellar and circumgalactic gas to remain predominantly warm (similar to 10(4) K) even before cosmic reionization. By contrast, without RT, star formation regulation occurs only through starbursts and their associated vigorous galactic outflows. In spite of this difference, the entire simulation suite (with the exception of models without any feedback) matches observed dwarf galaxy sizes, velocity dispersions, V-band magnitudes, and dynamical mass-to-light-ratios. This is because such structural scaling relations are predominantly set by the host dark matter halo, with the remaining model-to-model variation being smaller than the observational scatter. We find that only the stellar mass-metallicity relation differentiates the galaxy formation models. Explosive feedback ejects more metals from the dwarf, leading to a lower metallicity at a fixed stellar mass. We conclude that the stellar mass-metallicity relation of the very smallest galaxies provides a unique constraint on galaxy formation physics.
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