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  Simulating cosmological substructure in the solar neighbourhood

Simpson, C. M., Gargiulo, I., Gómez, F. A., Grand, R. J. J., Maffione, N., Cooper, A. P., et al. (2019). Simulating cosmological substructure in the solar neighbourhood. Monthly Notices of the Royal Astronomical Society: Letters, 490(1), L32-L37. doi:10.1093/mnrasl/slz142.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-6FE9-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-6FEA-7
Genre: Journal Article

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 Creators:
Simpson, Christine M., Author
Gargiulo, Ignacio, Author
Gómez, Facundo A., Author
Grand, Robert J. J.1, Author              
Maffione, Nicolás, Author
Cooper, Andrew P., Author
Deason, Alis J., Author
Frenk, Carlos, Author
Helly, John, Author
Marinacci, Federico, Author
Pakmor, Rüdiger2, Author              
Affiliations:
1Galaxy Formation, Cosmology, MPI for Astrophysics, Max Planck Society, ou_159878              
2Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              

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 Abstract: We explore the predictive power of cosmological, hydrodynamical simulations for stellar phase-space substructure and velocity correlations with the auriga simulations and aurigaia mock Gaia catalogues. We show that at the solar circle the auriga simulations commonly host phase-space structures in the stellar component that have constant orbital energies and arise from accreted subhaloes. These structures can persist for a few Gyr, even after coherent streams in position space have been erased. We also explore velocity two-point correlation functions and find this diagnostic is not deterministic for particular clustering patterns in phase space. Finally, we explore these structure diagnostics with the aurigaia catalogues and show that current catalogues have the ability to recover some structures in phase space but careful consideration is required to separate physical structures from numerical structures arising from catalogue generation methods.

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 Dates: 2019-09-20
 Publication Status: Published online
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 Rev. Method: Peer
 Identifiers: DOI: 10.1093/mnrasl/slz142
Other: LOCALID: 3232387
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Title: Monthly Notices of the Royal Astronomical Society: Letters
  Other : Mon. Not. Roy. Astron. Soc.: Letters
Source Genre: Journal
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Publ. Info: Oxford : Blackwell Science
Pages: - Volume / Issue: 490 (1) Sequence Number: - Start / End Page: L32 - L37 Identifier: ISSN: 1745-3925
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000021470