Subhaloes gone Notts: Spin across subhaloes and finders

Abstract

We present a study of a comparison of spin distributions of subhaloes found associated with a host halo. The subhaloes are found within two cosmological simulation families of Milky Way-like galaxies, namely the Aquarius and GHALO simulations. These two simulations use different gravity codes and cosmologies. We employ ten different substructure finders, which span a wide range of methodologies from simple overdensity in configuration space to full 6-d phase space analysis of particles.We subject the results to a common post-processing pipeline to analyse the results in a consistent manner, recovering the dimensionless spin parameter. We find that spin distribution is an excellent indicator of how well the removal of background particles (unbinding) has been carried out. We also find that the spin distribution decreases for substructure the nearer they are to the host halo's, and that the value of the spin parameter rises with enclosed mass towards the edge of the substructure. Finally subhaloes are less rotationally supported than field haloes, with the peak of the spin distribution having a lower spin parameter.

10 pages, 14 figures and 3 tables. Accepted for publication in MNRAS

References in corpus (11)

• The hierarchical formation of the brightest cluster galaxies
• The spin and shape of dark matter haloes in the Millennium simulation of a LambdaCDM universe
• Dark matter and cosmic structure
• Building Merger Trees from Cosmological N-body Simulations
• SubHaloes going Notts: The SubHalo-Finder Comparison Project
• The recycling of gas and metals in galaxy formation: predictions of a dynamical feedback model
• Shape, spin and baryon fraction of clusters in the MareNostrum Universe
• VOBOZ: An Almost-Parameter-Free Halo-Finding Algorithm
• Do Mergers Spin up Dark Matter Halos?
• On the Correlation between Spin Parameter and Halo Mass
• The nature of assembly bias - II. Halo spin

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