Are mergers responsible for universal halo properties?
نویسندگان
چکیده
منابع مشابه
Are mergers responsible for universal halo properties?
N -body simulations of Cold Dark Matter (CDM) have shown that, in this hierarchical structure formation model, dark matter halo properties, such as the density profile, the phase-space density profile, the distribution of axial ratio, the distribution of spin parameter, and the distribution of internal specific angular momentum follow ‘universal’ laws or distributions. Here we study the propert...
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We analyse the spatial distribution of halo merger sites using four numerical simulations with high time resolution of structure growth in a Λ-CDM cosmology. We find no evidence for any large-scale relative bias between mergers and randomly selected haloes of the same mass at high redshift. Given a sample of galaxies that form a Poisson sampling of halo mergers, then the amplitude of the measur...
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We perform a series of high – resolution N-body simulations designed to examine the density profiles of dark matter halos. From 12 simulated halos ranging the mass of 2 × 10 ∼ 5 × 10hM⊙ (represented by ∼ 1 million particles within the virial radius), we find a clear systematic correlation between the halo mass and the slope of the density profile at 1% of the virial radius, in addition to the v...
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The rate of merging of dark-matter halos is an absolutely essential ingredient for studies of both structure and galaxy formation. Remarkably, however, our quantitative understanding of the halo merger rate is still quite limited, and current analytic descriptions based upon the extended Press-Schechter formalism are fundamentally flawed. We show that a mathematically self-consistent merger rat...
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DARK MATTER HALO MERGERS AND QUASARS Jorge Moreno Ravi Sheth, Advisor The formation and evolution of galaxies and the supermassive black holes they harbor at their nuclei depends strongly on the merger history of their surrounding dark matter haloes. First we developed a semi-analytic algorithm that describes the merger history tree of a halo. The following tests were performed: the conditional...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2009
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2009.14755.x