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  Dark matter halo shapes in the Auriga simulations

Prada, J., Forero-Romero, J. E., Grand, R. J. J., Pakmor, R., & Springel, V. (2019). Dark matter halo shapes in the Auriga simulations. Monthly Notices of the Royal Astronomical Society, 490(4), 4877-4888. doi:10.1093/mnras/stz2873.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-C0D4-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-C0D5-1
Genre: Journal Article

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Prada, Jesus, Author
Forero-Romero, Jaime E., Author
Grand, Robert J. J.1, Author              
Pakmor, Rüdiger2, Author              
Springel, Volker3, Author              
Affiliations:
1Galaxy Formation, Cosmology, MPI for Astrophysics, Max Planck Society, ou_159878              
2Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              
3Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              

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 Abstract: We present shape measurements of Milky Way–sized dark matter haloes at redshift z = 0 in a suite of 30 zoom simulations from the Auriga project. We compare the results in full magnetohydrodynamics against dark matter–only simulations and find a strong influence of baryons in making dark matter haloes rounder at all radii compared to their dark matter–only counterparts. At distances ≲30 kpc, rounder dark matter distributions correlate with extended massive stellar discs and low-core gas densities. We measure the alignment between the halo and the disc shapes at different radii and find a high degree of alignment at all radii for most of the galaxies. In some cases, the alignment significantly changes as a function of radius implying that the halo shape twists; this effect correlates with recently formed bulges and is almost absent in the dark matter–only simulations. In a comparison against observational constraints, we find that 20 per cent of haloes in our sample are consistent with observational results derived from the Pal 5 stream that favours an almost spherical shape. Including baryons is a required element to achieve this level of agreement. In contrast, none of the simulations (neither dark matter only nor with baryons) match the constraints derived from the Sagittarius stream that favour an oblate dark matter halo.

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 Dates: 2019-12-04
 Publication Status: Published online
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 Rev. Method: Peer
 Identifiers: DOI: 10.1093/mnras/stz2873
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Title: Monthly Notices of the Royal Astronomical Society
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Source Genre: Journal
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Publ. Info: OXFORD : OXFORD UNIV PRESS
Pages: - Volume / Issue: 490 (4) Sequence Number: - Start / End Page: 4877 - 4888 Identifier: ISSN: 0035-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000021470