2007/01/18 by S. Colombi, Stéphane Colombi, M. J. Chodorowski +2 · 29 citations
Physics and Astronomy · #Astrophysics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Galaxy #Halo mass function #Peculiar velocity #Physics #Redshift #Redshift survey #Redshift-space distortions #Scientific Research and Discoveries #astro-ph
paper · pdf · doi:10.1111/j.1365-2966.2006.11330.x
published in Monthly Notices of the Royal Astronomical Society 375(1), 348-370 (Oxford University Press) · 24 pages, 10 figures. Matches the version accepted for publication in MNRAS. The definitive version is available at http://www.blackwell-synergy.com
openalex publication_date 2007/01/18 · arxiv created 2008/05/12 · arxiv updated 2011/02/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
One of the most striking results is that non-linear effects, including ‘fingers of God’, affect mainly the tails of the joint probability distribution function (PDF) of the velocity and gravity field: the 1–1.5 σ region around the maximum of the PDF is dominated by the linear theory regime, both in real and redshift space. This is understood explicitly by using the spherical collapse model as a proxy of non-linear dynamics. Applications of the method to real galaxy catalogues are discussed, including a preliminary investigation on homogeneous (volume-limited) ‘galaxy’ samples extracted from the simulation with simple prescriptions based on halo and substructure identification, to quantify the effects of the bias between the galaxy distribution and the total matter distribution, as well as the effects of shot noise.