Merging Rates of the First Objects and the Formation of First Mini-Filaments in Models with Massive Neutrinos - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




Merging Rates of the First Objects and the Formation of First Mini-Filaments in Models with Massive Neutrinos - Astrophysics > Cosmology and Nongalactic Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We study the effect of massive neutrinos on the formation and evolution ofthe first filaments containing the first star-forming halos of massM~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 halosinto zero-dimensional larger halos and one-dimensional first filaments. It isshown that as the neutrino mass fraction f { u} increases, thehalo-to-filament merging rate increases while the halo-to-halo merging ratedecreases sharply. For f { u}<=0.04, the halo-to-filament merging rate isnegligibly low at all filament mass scales, while for f { u}>=0.07 thehalo-to-filament merging rate exceeds 0.1 at the characteristic filament massscale of ~10^{9}M sun. The distribution of the redshifts at which the firstfilaments ultimately collapse along their longest axes is derived and found tohave a sharp maximum at z~8. We also investigate the formation and evolution ofthe second generation filaments which contain the first galaxies of mass10^{9}M sun at z=8 as the parent of the first generation filaments. A similartrend is found: For f { u}>= 0.07 the rate of clustering of the first galaxiesinto the second-generation filaments exceeds 0.3 at the characteristic massscale of ~10^{11}M sun. The longest-axis collapse of these second-generationfilaments are found to occur at z~3. The implications of our results on theformation of massive high-z galaxies and the early metal enrichment of theintergalactic media by supernova-driven outflows, and possibility ofconstraining the neutrino mass from the mass distribution of the high-z centralblackholes are discussed.



Author: Hyunmi Song, Jounghun Lee Seoul Nat'l Univ.

Source: https://arxiv.org/



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