Merging Rates of the First Objects and the Formation of First Mini-Filaments in Models with Massive Neutrinos
arXiv:1006.4101 · doi:10.1088/0004-637X/736/1/27
Abstract
We study the effect of massive neutrinos on the formation and evolution of the first filaments containing the first star-forming halos of mass M~10^{6}M_sun at z~20. With the help of the extended Press-Schechter formalism, we evaluate analytically the rates of merging of the first star-forming halos into zero-dimensional larger halos and one-dimensional first filaments. It is shown that as the neutrino mass fraction f_ν increases, the halo-to-filament merging rate increases while the halo-to-halo merging rate decreases sharply. For f_ν<=0.04, the halo-to-filament merging rate is negligibly low at all filament mass scales, while for f_ν>=0.07 the halo-to-filament merging rate exceeds 0.1 at the characteristic filament mass scale of ~10^{9}M_sun. The distribution of the redshifts at which the first filaments ultimately collapse along their longest axes is derived and found to have a sharp maximum at z~8. We also investigate the formation and evolution of the second generation filaments which contain the first galaxies of mass 10^{9}M_sun at z=8 as the parent of the first generation filaments. A similar trend is found: For f_ν>= 0.07 the rate of clustering of the first galaxies into the second-generation filaments exceeds 0.3 at the characteristic mass scale of ~10^{11}M_sun. The longest-axis collapse of these second-generation filaments are found to occur at z~3. The implications of our results on the formation of massive high-z galaxies and the early metal enrichment of the intergalactic media by supernova-driven outflows, and possibility of constraining the neutrino mass from the mass distribution of the high-z central blackholes are discussed.
Accepted for publication in ApJ, mistakes in the calculation of the merging rates corrected, feasibility study of constraining neutrino mass with high-z quasar luminosity function presented, discussion improved, 7 figures
References in corpus (11)
- Cosmological Constraints from the SDSS Luminous Red Galaxies
- Massive neutrinos and cosmology
- Cosmological parameters from combining the Lyman-alpha forest with CMB, galaxy clustering and SN constraints
- The Nearly Universal Merger Rate of Dark Matter Haloes in Lambda-CDM Cosmology
- Six more quasars at redshift 6 discovered by the Canada-France High-z Quasar Survey
- Nonlinear power spectrum in the presence of massive neutrinos: perturbation theory approach, galaxy bias and parameter forecasts
- Constraints on dark matter particles from theory, galaxy observations and N-body simulations
- Massive Neutrinos in Cosmology: Analytic Solutions and Fluid Approximation
- Anisotropic AGN Outflows and Enrichment of the Intergalactic Medium
- Anisotropic AGN Outflows and Enrichment of the Intergalactic Medium. II. Metallicity
- Probing the Warm Dark Matter with High-z Quasar Luminosity Function