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EDGE : What shapes the relationship between H i and stellar observables in faint dwarf galaxies?

Rey, Martin P. LU ; Pontzen, Andrew ; Agertz, Oscar LU ; Orkney, Matthew D.A. ; Read, Justin I. ; Saintonge, Amelie ; Kim, Stacy Y. and Das, Payel (2022) In Monthly Notices of the Royal Astronomical Society 511(4). p.5672-5681
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∗ 106, M⊙). Across a suite of cosmological, high-resolution zoomed simulations, we find that dwarf galaxies of stellar masses 105 ≤ M∗ ≤ 106, M⊙ 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... (More)

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∗ 106, M⊙). Across a suite of cosmological, high-resolution zoomed simulations, we find that dwarf galaxies of stellar masses 105 ≤ M∗ ≤ 106, M⊙ 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 M H,\small I, 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∗-M H, small I 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.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Galaxies: dwarf, Galaxies: evolution, Galaxies: haloes, Galaxies: structure, Methods: numerical
in
Monthly Notices of the Royal Astronomical Society
volume
511
issue
4
pages
10 pages
publisher
Oxford University Press
external identifiers
  • scopus:85127448895
ISSN
0035-8711
DOI
10.1093/mnras/stac502
language
English
LU publication?
yes
id
467e9b62-6ada-4255-a6f7-94c1f7cbe137
date added to LUP
2022-06-02 11:03:34
date last changed
2024-04-18 10:48:37
@article{467e9b62-6ada-4255-a6f7-94c1f7cbe137,
  abstract     = {{<p>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∗ 106, M⊙). Across a suite of cosmological, high-resolution zoomed simulations, we find that dwarf galaxies of stellar masses 105 ≤ M∗ ≤ 106, M⊙ 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 M H,\small I, 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∗-M H, small I 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. </p>}},
  author       = {{Rey, Martin P. and Pontzen, Andrew and Agertz, Oscar and Orkney, Matthew D.A. and Read, Justin I. and Saintonge, Amelie and Kim, Stacy Y. and Das, Payel}},
  issn         = {{0035-8711}},
  keywords     = {{Galaxies: dwarf; Galaxies: evolution; Galaxies: haloes; Galaxies: structure; Methods: numerical}},
  language     = {{eng}},
  number       = {{4}},
  pages        = {{5672--5681}},
  publisher    = {{Oxford University Press}},
  series       = {{Monthly Notices of the Royal Astronomical Society}},
  title        = {{EDGE : What shapes the relationship between H i and stellar observables in faint dwarf galaxies?}},
  url          = {{http://dx.doi.org/10.1093/mnras/stac502}},
  doi          = {{10.1093/mnras/stac502}},
  volume       = {{511}},
  year         = {{2022}},
}