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  Lyman α absorption beyond the disc of simulated spiral galaxies

Röttgers, B., Naab, T., Cernetic, M., Davé, R., Kauffmann, G., Borthakur, S., et al. (2020). Lyman α absorption beyond the disc of simulated spiral galaxies. Monthly Notices of the Royal Astronomical Society, 496(1), 152-168. doi:10.1093/mnras/staa1490.

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Röttgers, Bernhard1, Author           
Naab, Thorsten1, Author           
Cernetic, Miha1, Author           
Davé , Romeel, Author
Kauffmann, Guinevere2, Author           
Borthakur, Sanchayeeta, Author
Foidl, Horst, Author
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1Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              
2Cosmology, MPI for Astrophysics, Max Planck Society, ou_159876              

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 Abstract: We present an analysis of the origin and properties of the circumgalactic medium (CGM) in a suite of 11 cosmological zoom simulations resembling present-day spiral galaxies. On average the galaxies retain about 50 per cent of the cosmic fraction in baryons, almost equally divided into disc (interstellar medium) gas, cool CGM gas and warm-hot CGM gas. At radii smaller than 50 kpc the CGM is dominated by recycled warm-hot gas injected from the central galaxy, while at larger radii it is dominated by cool gas accreted on to the halo. The recycled gas typically accounts for one-third of the CGM mass. We introduce the novel publicly available analysis tool pygad to compute ion abundances and mock absorption spectra. For Lyman α absorption, we find good agreement of the simulated equivalent width (EW) distribution and observations out to large radii. Disc galaxies with quiescent assembly histories show significantly more absorption along the disc major axis. By comparing the EW and H i column densities, we find that CGM Lyman α absorbers are best represented by an effective line width b ≈ 50–70 km s−1 that increases mildly with halo mass, larger than typically assumed.

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 Dates: 2020-06-02
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/staa1490
Other: LOCALID: 3260725
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 496 (1) Sequence Number: - Start / End Page: 152 - 168 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150