Profiles of dark matter haloes at high redshift |
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| Authors: | A. Del Popolo |
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| Affiliation: | 1Dipartimento di Matematica, UniversitàStatale di Bergamo, Piazza Rosate, 2 –I 24129 Bergamo, Italy;2Feza Gürsey Institute, PO Box 6 Çengelköy, Istanbul, Turkey;3Bogˇaziçi University, Physics Department, 80815 Bebek, Istanbul, Turkey |
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| Abstract: | I study the evolution of halo density profiles as a function of time in the SCDM and ΛCDM cosmologies. Following Del Popolo, I calculate the concentration parameter c = r v / a and study its time evolution. For a given halo mass, I find that c ( z ) ∝ 1/(1+ z ) in both the ΛCDM and SCDM cosmology, in agreement with the analytic model of Bullock et al. and N -body simulations. In both models, a ( z ) is roughly constant. The present model predicts a stronger evolution of c ( z ) with respect to the Navarro, Frenk & White model. Finally I show some consequences of the results on galaxy modelling. |
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| Keywords: | galaxies: formation cosmology: theory large-scale structure of Universe |
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