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Cited by 20Galaxies: Formation, Evolution, PhenomenaAstrophysics and Star Formation StudiesStellar, planetary, and galactic studies

The diversity of the circumgalactic medium around z = 0 Milky Way-mass galaxies from the Auriga simulations

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Hani, Maan H, Ellison, Sara L, Sparre, Martin, Grand, Robert J J, Pakmor, Rüediger, Gomez, Facundo A, Springel, Volker·2019·Monthly Notices of the Royal Astronomical Society
DOI 10.1093/mnras/stz1708
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Abstract

Galaxies are surrounded by massive gas reservoirs (i.e. the circumgalactic medium; CGM) which play a key role in their evolution. The properties of the CGM, which are dependent on a variety of internal and environmental factors, are often inferred from absorption line surveys which rely on a limited number of single lines-of-sight. In this work we present an analysis of 28 galaxy haloes selected from the Auriga project, a cosmological magneto-hydrodynamical zoom-in simulation suite of isolated Milky Way-mass galaxies, to understand the impact of CGM diversity on observational studies. Although the Auriga haloes are selected to populate a narrow range in halo mass, our work demonstrates that the CGM of L⋆ galaxies is extremely diverse: column densities of commonly observed species span ∼3 − 4 dex and their covering fractions range from ${\sim } 5$ to $90{{\ \rm per\ cent}}$. Despite this diversity, we identify the following correlations: 1) the covering fractions (CF) of hydrogen and metals of the Auriga haloes positively correlate with stellar mass, 2) the CF of H i, C iv, and Si ii anticorrelate with active galactic nucleus luminosity due to ionization effects, and 3) the CF of H i, C iv, and Si ii positively correlate with galaxy disc fraction due to outflows populating the CGM with cool and dense gas. The Auriga sample demonstrates striking diversity within the CGM of L⋆ galaxies, which poses a challenge for observations reconstructing CGM characteristics from limited samples, and also indicates that long-term merger assembly history and recent star formation are not the dominant sculptors of the CGM.

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  • There is significant halo-to-halo scatter in the CGM distributions around MW-mass galaxies, but the median distribution shows good agreement between the three simulations.

    “We find significant haloto-halo scatter, which is indicative of the diversity of CGM distributions around MW-mass galaxies (Hani et al. 2019; Davies et al. 2020), but the median distribution shows good agreement between the three simulations.”

    From The milky way total mass profile as inferred from Gaia DR2 (2020) · cites this paper as Hani et al. 2019

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Research works printed but not linked: 4

  1. Corlies L., Peeples M. S., Tumlinson J., O'Shea B. W., Lehner N., Howk J. C., O'Meara J. M., 2018, preprint, ( arXiv:1811.05060 ) · arXiv
  2. Forbes J. C., Lin D. N. C., 2018, preprint, ( arXiv:1810.12925 ) · arXiv
  3. Uldall Fynbo J. P., 2019, arXiv e-prints, p. arXiv:1901.10777 · arXiv
  4. Werk J. K., et al., 2019, arXiv e-prints, p. arXiv:1904.11014 · arXiv

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Authors
Hani, M. H., Ellison, S. L., Sparre, M., Grand, R. J. J., Pakmor, R., Gomez, F. A., & Springel, V.
Affiliations
  • University of Victoria (CA)
  • University of Potsdam (DE)
  • Max Planck Institute for Astrophysics (DE)
  • Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85741 Garching, Germany
  • Instituto de Investigación Multidisciplinar en Ciencia y Tecnología, Universidad de La Serena, Raúl Bitrán 1305 La Serena, Chile
Corresponding author
Hani, Maan H
ORCID
Venue
Monthly Notices of the Royal Astronomical Society
Publisher
Oxford University Press (OUP)
Published
2019-06-21
Volume
488
Issue
1
Pages
135-152
ISSN
  • 0035-8711 (ISSN-L)
  • 1365-2966
DOI
10.1093/mnras/stz1708
OpenAlex
W2951417996
Cited by
20
References
183
Citations by year
2025: 2 · 2024: 3 · 2023: 1 · 2022: 6 · 2021: 5 · 2020: 2 · 2019: 1
FWCI
1.87
Type
journal article
Language
en
Open access
Licence
academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model (vor, 1 d)
Locations
  • Monthly Notices of the Royal Astronomical Society (publishedVersion)
  • Liverpool John Moores University (acceptedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • UVic’s Research and Learning Repository (University of Victoria) (submittedVersion)
  • publish.UP (University of Potsdam) (submittedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • European Research Council (CRAGSMAN-646955)
  • Consejo Nacional de Innovación, Ciencia y Tecnología
  • Fondo Nacional de Desarrollo Científico y Tecnológico
  • Max Planck Society
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
Keywords
circumgalactic medium, Milky Way-mass galaxies, Auriga simulations, covering fraction, column density, metals, C IV, Si II, active galactic nuclei, galactic outflows, stellar mass, galaxy evolution, zoom-in simulations

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