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Title: MERGING RATES OF THE FIRST OBJECTS AND FORMATION OF THE FIRST MINI-FILAMENTS IN MODELS WITH MASSIVE NEUTRINOS

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 {approx} 10{sup 6} M{sub sun} at z {approx} 20. With the help of the extended Press-Schechter formalism, we evaluate analytically the merging rates 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{sub {nu}} increases, the halo-to-filament merging rate increases while the halo-to-halo merging decreases sharply. For f{sub {nu}} {<=} 0.04, the halo-to-filament merging rate is negligibly low at all filament mass scales, while for f{sub {nu}} {>=} 0.07 it exceeds 0.1 at the characteristic filament mass scale of {approx}10{sup 9} M{sub 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 {approx} 8. We also investigate the formation and evolution of second-generation filaments which contain the first galaxies of mass 10{sup 9} M{sub sun} at z = 8. A similar trend is found: for f{sub {nu}} {>=} 0.07 the rate of clustering of the first galaxies into second-generation filaments exceeds 0.3 at the characteristicmore » mass scale of {approx}10{sup 11} M{sub sun}. The longest-axis collapse of these second-generation filaments is found to occur at z {approx} 3. The implications of our results on the formation of massive high-z galaxies and the early metal enrichment of the intergalactic medium by supernova-driven outflows, and the possibility of constraining the neutrino mass from the mass distribution of the high-z central black holes, are discussed.« less

Authors:
;  [1]
  1. Astronomy Program, FPRD, Department of Physics and Astronomy, Seoul National University, Seoul 151-747 (Korea, Republic of)
Publication Date:
OSTI Identifier:
21578345
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 736; Journal Issue: 1; Other Information: DOI: 10.1088/0004-637X/736/1/27; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGY; EVOLUTION; FILAMENTS; GALAXIES; MASS DISTRIBUTION; NEUTRINOS; STARS; DISTRIBUTION; ELEMENTARY PARTICLES; FERMIONS; LEPTONS; MASSLESS PARTICLES; SPATIAL DISTRIBUTION

Citation Formats

Song, Hyunmi, and Lee, Jounghun, E-mail: hmsong@astro.snu.ac.kr, E-mail: jounghun@astro.snu.ac.kr. MERGING RATES OF THE FIRST OBJECTS AND FORMATION OF THE FIRST MINI-FILAMENTS IN MODELS WITH MASSIVE NEUTRINOS. United States: N. p., 2011. Web. doi:10.1088/0004-637X/736/1/27.
Song, Hyunmi, & Lee, Jounghun, E-mail: hmsong@astro.snu.ac.kr, E-mail: jounghun@astro.snu.ac.kr. MERGING RATES OF THE FIRST OBJECTS AND FORMATION OF THE FIRST MINI-FILAMENTS IN MODELS WITH MASSIVE NEUTRINOS. United States. doi:10.1088/0004-637X/736/1/27.
Song, Hyunmi, and Lee, Jounghun, E-mail: hmsong@astro.snu.ac.kr, E-mail: jounghun@astro.snu.ac.kr. Wed . "MERGING RATES OF THE FIRST OBJECTS AND FORMATION OF THE FIRST MINI-FILAMENTS IN MODELS WITH MASSIVE NEUTRINOS". United States. doi:10.1088/0004-637X/736/1/27.
@article{osti_21578345,
title = {MERGING RATES OF THE FIRST OBJECTS AND FORMATION OF THE FIRST MINI-FILAMENTS IN MODELS WITH MASSIVE NEUTRINOS},
author = {Song, Hyunmi and Lee, Jounghun, E-mail: hmsong@astro.snu.ac.kr, E-mail: jounghun@astro.snu.ac.kr},
abstractNote = {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 {approx} 10{sup 6} M{sub sun} at z {approx} 20. With the help of the extended Press-Schechter formalism, we evaluate analytically the merging rates 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{sub {nu}} increases, the halo-to-filament merging rate increases while the halo-to-halo merging decreases sharply. For f{sub {nu}} {<=} 0.04, the halo-to-filament merging rate is negligibly low at all filament mass scales, while for f{sub {nu}} {>=} 0.07 it exceeds 0.1 at the characteristic filament mass scale of {approx}10{sup 9} M{sub 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 {approx} 8. We also investigate the formation and evolution of second-generation filaments which contain the first galaxies of mass 10{sup 9} M{sub sun} at z = 8. A similar trend is found: for f{sub {nu}} {>=} 0.07 the rate of clustering of the first galaxies into second-generation filaments exceeds 0.3 at the characteristic mass scale of {approx}10{sup 11} M{sub sun}. The longest-axis collapse of these second-generation filaments is found to occur at z {approx} 3. The implications of our results on the formation of massive high-z galaxies and the early metal enrichment of the intergalactic medium by supernova-driven outflows, and the possibility of constraining the neutrino mass from the mass distribution of the high-z central black holes, are discussed.},
doi = {10.1088/0004-637X/736/1/27},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 736,
place = {United States},
year = {2011},
month = {7}
}