Cited by 62Galaxies: Formation, Evolution, PhenomenaStellar, planetary, and galactic studiesAstrophysical Phenomena and Observations

Alignments between galaxies, satellite systems and haloes

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Shao, Shi, Cautun, Marius, Frenk, Carlos S., Gao, Liang, Crain, Robert A., Schaller, Matthieu, Schaye, Joop, Theuns, Tom·2016·Monthly Notices of the Royal Astronomical Society

Abstract

The spatial distribution of the satellite populations of the Milky Way and Andromeda are puzzling in that they are nearly perpendicular to the discs of their central galaxies. To understand the origin of such configurations we study the alignment of the central galaxy, satellite system and dark matter halo in the largest of the ‘Evolution and Assembly of GaLaxies and their Environments’ (eagle) simulation. We find that centrals and their satellite systems tend to be well aligned with their haloes, with a median misalignment angle of 33° in both cases. While the centrals are better aligned with the inner 10 kpc halo, the satellite systems are better aligned with the entire halo indicating that satellites preferentially trace the outer halo. The central–satellite alignment is weak (median misalignment angle of 52°) and we find that around 20 per cent of systems have a misalignment angle larger than 78°, which is the value for the Milky Way. The central–satellite alignment is a consequence of the tendency of both components to align with the dark matter halo. As a consequence, when the central is parallel to the satellite system, it also tends to be parallel to the halo. In contrast, if the central is perpendicular to the satellite system, as in the case of the Milky Way and Andromeda, then the central–halo alignment is much weaker. Dispersion-dominated (spheroidal) centrals have a stronger alignment with both their halo and their satellites than rotation-dominated (disc) centrals. We also found that the halo, the central galaxy and the satellite system tend to be aligned with the surrounding large-scale distribution of matter, with the halo being the better aligned of the three.

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Research works printed but not linked: 3

  1. Buck T., Dutton A. A., Macciò A. V., 2016, preprint (arXiv:1510.06028) · arXiv
  2. Kunkel W. E., Demers S., 1976, in Dickens R. J., Perry J. E., Smith F. G., King I. R., eds, Royal Greenwich Observatory Bulletins, Vol. 182, The Galaxy and the Local Group. Royal Greenwich Observatory, Herstmon- ceaux, p. 241
  3. Tenneti A., Mandelbaum R., Di Matteo T., 2015, preprint (arXiv:1510.07024) · arXiv

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Authors
Shao, S., Cautun, M., Frenk, C. S., Gao, L., Crain, R. A., Schaller, M., Schaye, J., & Theuns, T.
Affiliations
  • Durham University (GB)
  • Liverpool John Moores University (GB)
  • Leiden University (NL)
Corresponding author
  • Shao, Shi
  • Cautun, Marius
Venue
Monthly Notices of the Royal Astronomical Society
Published
2016-05-24
Volume
460
Issue
4
Pages
3772-3783
ISSN
  • 0035-8711 (ISSN-L)
  • 1365-2966
OpenAlex
W2346489243
Cited by
61
References
102
Citations by year
2026: 3 · 2025: 2 · 2024: 5 · 2023: 3 · 2022: 8 · 2021: 9 · 2020: 9 · 2019: 4 · 2018: 10 · 2017: 7 · 2016: 1
FWCI
3.40
Type
journal article
Language
en
Open access
Locations
  • Monthly Notices of the Royal Astronomical Society (publishedVersion)
  • arXiv (Cornell University) (publishedVersion)
  • Liverpool John Moores University (acceptedVersion)
  • Leiden Repository (Leiden University) (submittedVersion)
  • Durham Research Online (Durham University) (submittedVersion, cc-by)
  • Data Archiving and Networked Services (DANS) (submittedVersion, other-oa)
  • HighWire Press Open Archive (submittedVersion)
  • arXiv (Cornell University)
Funders
  • Durham University (ST/K00042X/1, ST/K003267/1, ST/H008519/1)
  • National Natural Science Foundation of China (11133003, ST/K003267/1, ST/K00042X/1, ST/H008519/1, 11425312, XDB09000000)
  • Partnership for Advanced Computing in Europe AISBL
  • Chinese Academy of Sciences (#XDB09000000)
  • Belgian Federal Science Policy Office (AP P7/08 CHARM)
  • Science and Technology Facilities Council (ST/I00162X/1, ST/H008519, ST/K00042X/1, ST/M007006/1, ST/I001573/1, ST/F010176/1, ST/L00075X/1, ST/M000966/1, ST/F001166/1, ST/H008519/1, ST/K003267/1)
  • FP7 Ideas: European Research Council (278594, 267291)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
Keywords
galaxy alignment, satellite systems, dark matter halos, Milky Way, Andromeda, galaxy disks, spheroidal galaxies, galaxy formation and evolution, large-scale structure, EAGLE simulation

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