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Verfasst von:Zjupa, Jolanta [VerfasserIn]   i
 Springel, Volker [VerfasserIn]   i
Titel:Angular momentum properties of haloes and their baryon content in the Illustris simulation
Verf.angabe:Jolanta Zjupa and Volker Springel
E-Jahr:2016
Jahr: 17 November 2016
Umfang:23 S.
Fussnoten:Gesehen am 23.10.2017
Titel Quelle:Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
Ort Quelle:Oxford : Oxford Univ. Press, 1827
Jahr Quelle:2017
Band/Heft Quelle:466(2017), 2, Seite 1625-1647
ISSN Quelle:1365-2966
Abstract:The angular momentum properties of virialized dark matter haloes have been measured with good statistics in collisionless N-body simulations, but an equally accurate analysis of the baryonic spin is still missing. We employ the Illustris simulation suite, one of the first simulations of galaxy formation with full hydrodynamics that produces a realistic galaxy population in a sizeable volume, to quantify the baryonic spin properties for more than ∼320 000 haloes. We first compare the systematic differences between different spin parameter and halo definitions, and the impact of sample selection criteria on the derived properties. We confirm that dark-matter-only haloes exhibit a close to self-similar spin distribution in mass and redshift of lognormal form. However, the physics of galaxy formation radically changes the baryonic spin distribution. While the dark matter component remains largely unaffected, strong trends with mass and redshift appear for the spin of diffuse gas and the formed stellar component. With time, the baryons staying bound to the halo develop a misalignment of their spin vector with respect to dark matter, and increase their specific angular momentum by a factor of ∼1.3 in the non-radiative case and ∼1.8 in the full physics setup at z = 0. We show that this enhancement in baryonic spin can be explained by the combined effect of specific angular momentum transfer from dark matter on to gas during mergers and from feedback expelling low specific angular momentum gas from the halo. Our results challenge certain models for spin evolution and underline the significant changes induced by baryonic physics in the structure of haloes.
DOI:doi:10.1093/mnras/stw2945
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

kostenfrei: Volltext: http://dx.doi.org/10.1093/mnras/stw2945
 DOI: https://doi.org/10.1093/mnras/stw2945
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1564662160
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