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  Photometric and kinematic misalignments and their evolution among fast and slow rotators in the illustris simulation

Yang, L., Xu, D., Mao, S., Springel, V., & Li, H. (2019). Photometric and kinematic misalignments and their evolution among fast and slow rotators in the illustris simulation. Monthly Notices of the Royal Astronomical Society, 489(1), 534-547. doi:10.1093/mnras/stz2156.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-55BD-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-55BE-6
Genre: Journal Article

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Photometric and kinematic misalignments and their evolution among fast and slow rotators in the illustris simulation.pdf (Any fulltext), 5MB
 
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Yang, Lisiyuan, Author
Xu, Dandan, Author
Mao, Shude, Author
Springel, Volker1, Author              
Li, Hongyu, Author
Affiliations:
1Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              

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 Abstract: We use the Illustris simulation to study the distributions of ellipticities and kinematic misalignments of galactic projections, as well as the intrinsic shapes and rotation of the simulated galaxies. Our results for the projections of galaxies display clear trends of an overall increase of kinematic misalignment and a slight decrease of ellipticity for fast rotators with increasing masses, while revealing no clear distinction between slow rotators of different mass. It is also found that the number of very slow rotators with large ellipticities is much larger than found in observations. The intrinsic properties of the galaxies are then analysed. The results for the intrinsic shapes of the galaxies are mostly consistent with previous results inferred from observational data. The distributions of intrinsic misalignment of the galaxies suggest that some of the galaxies produced by Illustris have significant rotation around their medium axes. Further analysis reveals that most of these galaxies display signs of non-equilibrium. We then study the evolution of the intrinsic misalignments and shapes of three specific Illustris galaxies, which we consider as typical ones, along the main progenitor line of their merger trees, revealing how mergers influence the intrinsic shapes and kinematics: the spin axis in general stays close to the shortest axis, and tends to quickly relax to such an equilibrium state within a few dynamical times of the galaxy after major perturbations; triaxiality and intrinsic flatness in general decrease with time, however, sometimes increases occur that are clearly seen to correlate with major merger events.

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 Dates: 2019-08-05
 Publication Status: Published online
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 Rev. Method: Peer
 Identifiers: DOI: 10.1093/mnras/stz2156
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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: 489 (1) Sequence Number: - Start / End Page: 534 - 547 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150