Hierarchical Growth and Cosmic Star Formation: Enrichment, Outflows, and Supernova Rates
- 20 August 2006
- journal article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 647 (2), 773-786
- https://doi.org/10.1086/503092
Abstract
The cosmic star formation histories are evaluated for different minimum masses of the initial halo structures, with allowance for realistic gas outflows. With a minimum halo mass of 10^{7} - 10^{8} M_odot and a moderate outflow efficiency, we reproduce both the current baryon fraction and the early chemical enrichment of the IGM. The intensity of the formation rate of ``normal'' stars is also well constrained by the observations: it has to be dominated by star formation in elliptical galaxies, except perhaps at very low redshift. The fraction of baryons in stars is predicted as are also the type Ia and II supernova event rates. Comparison with SN observations in the redshift range z=0-2 allows us to set strong constraints on the time delay of type Ia supernovae (a total delay of \sim 4 Gyr is required to fit the data), the lower end of the mass range of the progenitors (2 - 8 M_odot) and the fraction of white dwarfs that reproduce the type Ia supernova (about 1 per cent). The intensity in the initial starburst of zero metallicity stars below 270 M_\odot must be limited in order to avoid premature overenrichment of the IGM. Only about 10 - 20 % of the metals present in the IGM at z = 0 have been produced by population III stars at very high z. The remaining 80 - 90 % are ejected later by galaxies forming normal stars, with a maximum outflow efficiency occurring at a redshift of about 5. We conclude that 10^{-3} of the mass in baryons must lie in first massive stars in order to produce enough ionizing photons to allow early reionization of the IGM by z \sim 15.Comment: 51 pages, 23 eps figureKeywords
This publication has 73 references indexed in Scilit:
- New Constraints on Type Ia Supernova Progenitor ModelsThe Astrophysical Journal, 2005
- Highly ionised absorbers at high redshiftProceedings of the International Astronomical Union, 2005
- Relic neutrino background from cosmological supernovaeNew Journal of Physics, 2004
- Type Ia supernova rate at a redshift of ~0.1Astronomy & Astrophysics, 2004
- On the Oxygen Abundance of HE 0107-5240The Astrophysical Journal, 2004
- Metals in the intergalactic mediumAstronomy & Astrophysics, 2004
- Metallicity of the Intergalactic Medium Using Pixel Statistics. III. SiliconThe Astrophysical Journal, 2004
- The First Sources of LightPublications of the Astronomical Society of the Pacific, 2004
- The Galaxy Luminosity Function and Luminosity Density at Redshiftz= 0.1The Astrophysical Journal, 2003
- Cosmic background radiation anisotropies in universes dominated by nonbaryonic dark matterThe Astrophysical Journal, 1984