Rey, Martin P;
Pontzen, Andrew;
Agertz, Oscar;
Orkney, Matthew DA;
Read, Justin I;
Saintonge, Amélie;
Kim, Stacy Y;
(2022)
EDGE: What shapes the relationship between Hi and stellar observables in faint dwarf galaxies?
Monthly Notices of the Royal Astronomical Society
, 511
(4)
pp. 5672-5681.
10.1093/mnras/stac502.
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Abstract
We show how the interplay between feedback and mass-growth histories introduces scatter in the relationship between stellar and neutral gas properties of field faint dwarf galaxies (M⋆⪅106M⊙). Across a suite of cosmological, high-resolution zoomed simulations, we find that dwarf galaxies of stellar masses 105≤M⋆≤106M⊙ are bimodal in their cold gas content, being either H i-rich or H i-deficient. This bimodality is generated through the coupling between (i) the modulation of H i contents by the background of ultraviolet radiation (UVB) at late times and (ii) the significant scatter in the stellar-to-halo mass relationship induced by reionization. Furthermore, our H i-rich dwarfs exhibit disturbed and time-variable neutral gas distributions primarily due to stellar feedback. Over the last four billion years, we observe order-of-magnitude changes around the median MHI, factor-of-a-few variations in H i spatial extents, and spatial offsets between H i and stellar components regularly exceeding the galaxies’ optical sizes. Time variability introduces further scatter in the M⋆−MHI relation and affects a galaxy’s detectability in H i at any given time. These effects will need to be accounted for when interpreting observations of the population of faint, H i-bearing dwarfs by the combination of optical and radio wide, deep surveys.
| Type: | Article |
|---|---|
| Title: | EDGE: What shapes the relationship between Hi and stellar observables in faint dwarf galaxies? |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stac502 |
| Publisher version: | https://doi.org/10.1093/mnras/stac502 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | methods: numerical, galaxies: dwarf, galaxies: evolution, galaxies: haloes, galaxies: structure |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10144915 |
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