Solving the puzzle of subhalo spins
arXiv:1501.03280 · doi:10.1088/0004-637X/801/2/93
Abstract
Investigating the spin parameter distribution of subhaloes in two high resolution isolated halo simulations, re- cent work by Onions et al. suggested that typical subhalo spins are consistently lower than the spin distribution found for field haloes. To further examine this puzzle, we have analyzed simulations of a cosmological volume with sufficient resolution to resolve a significant subhalo population. We confirm the result of Onions et al. and show that the typical spin of a subhalo decreases with decreasing mass and increasing proximity to the host halo center. We interpret this as the growing influence of tidal stripping in removing the outer layers, and hence the higher angular momentum particles, of the subhaloes as they move within the host potential. Investigating the redshift dependence of this effect, we find that the typical subhalo spin is smaller with decreasing redshift. This indicates a temporal evolution as expected in the tidal stripping scenario.
arXiv comment10 pages; 5 figures
References in corpus (43)
- The cosmological simulation code GADGET-2
- Simulating the joint evolution of quasars, galaxies and their large-scale distribution
- The many lives of active galactic nuclei: cooling flows, black holes and the luminosities and colours of galaxies
- Populating a cluster of galaxies - I. Results at z=0
- The broken hierarchy of galaxy formation
- The Formation of Galactic Disks
- Hierarchical Galaxy Formation
- The Aquarius Project: the subhalos of galactic halos
- The hierarchical formation of the brightest cluster galaxies
- From dwarf spheroidals to cDs: Simulating the galaxy population in a LCDM cosmology
- A universal angular momentum profile for galactic halos
- Resolving Cosmic Structure Formation with the Millennium-II Simulation
- Ahf: Amiga's Halo Finder
- Concentration, Spin and Shape of Dark Matter Haloes as a Function of the Cosmological Model: WMAP1, WMAP3 and WMAP5 results
- Concentration, Spin and Shape of Dark Matter Haloes: Scatter and the Dependence on Mass and Environment
- The Formation of Disk Galaxies
- The spin and shape of dark matter haloes in the Millennium simulation of a LambdaCDM universe
- The evolution substructure I: a new identification method
- Simulations of Galaxy Formation in a Lambda CDM Universe I: Dynamical and Photometric Properties of a Simulated Disk Galaxy
- Dark Halo and Disk Galaxy Scaling Laws in Hierarchical Universes
- Dark matter and cosmic structure
- Quantifying the heart of darkness with GHALO - a multi-billion particle simulation of our galactic halo
- Galacticus: A Semi-Analytic Model of Galaxy Formation
- The Colours of Satellite Galaxies in Groups and Clusters
- Galaxy Formation and Large-Scale Bias
- Statistics of Physical Properties of Dark Matter Clusters
- Structure Finding in Cosmological Simulations: The State of Affairs
- The recycling of gas and metals in galaxy formation: predictions of a dynamical feedback model
- The impact of baryons on the spins and shapes of dark matter haloes
- Resolving Subhaloes' Lives with the Hierarchical Bound-Tracing Algorithm
- Internal properties and environments of dark matter halos
- The cosmic history of the spin of dark matter haloes within the large scale structure
- Shape, spin and baryon fraction of clusters in the MareNostrum Universe
- A Comparison of Semi-Analytic and Smoothed Particle Hydrodynamics Galaxy Formation
- The Evolution of the Dark Halo Spin Parameters lambda and lambda' in a LCDM Universe: The Role of Minor and Major Mergers
- The angular momentum of cold dark matter haloes with and without baryons
- Dwarf Dark Matter Halos
- On the Correlation between Spin Parameter and Halo Mass
- Sussing Merger Trees: the influence of the halo finder
- The nature of assembly bias - II. Halo spin
- Subhaloes gone Notts: Spin across subhaloes and finders
- Dissecting the spin distribution of Dark Matter halos
- On the Spin Bias of Satellite Galaxies in the Local Group-like Environment