The impact of population III objects on the early universe
| dc.creator | Ciardi, Benedetta | |
| dc.creator | Ferrara, Andrea | |
| dc.date | 1998-09-11 | |
| dc.date.accessioned | 2026-07-07T02:27:54Z | |
| dc.date.available | 2026-07-07T02:27:54Z | |
| dc.description | We study the effects of the ionizing and dissociating photons produced by Pop III objects on the surrounding intergalactic medium. We find that the typical size of a H_2 photodissociated region is smaller than the mean distance between sources at z=20-30, but larger than the ionized region. This implies that clearing of the intergalactic H_2 occurs before reionization of the universe is complete. In the same redshift range, the soft-UV background in the Lyman- Werner bands, when the intergalactic H and H_2 opacity is included, is found to be J_LW = 10^-28 - 10^-26 erg cm^-2 s^-1 Hz^-1. This value is well below the treshold required for the negative feedback of Pop III objects on the subsequent galaxy formation to be effective. We have combined these semi-analytical results with high-resolution N-body simulations, to study the topological structure of photoionization and photodissociation and the evolution of the H^+ and H_2 filling factor. | |
| dc.description | 4 pages, 2 figures. To appear in the proceedings of the Xth Rencontres de Blois, "The Birth of Galaxies" | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9809149 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9809149 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/12891 | |
| dc.subject | Astrophysics | |
| dc.title | The impact of population III objects on the early universe | |
| dc.type | text |