Intergalactic H_2 Photodissociation and the Soft UV Background Produced by Population III Objects
| dc.creator | Ciardi, Benedetta | |
| dc.creator | Ferrara, Andrea | |
| dc.creator | Abel, Tom | |
| dc.date | 1998-11-09 | |
| dc.date | 1999-04-09 | |
| dc.date.accessioned | 2026-07-07T02:29:00Z | |
| dc.date.available | 2026-07-07T02:29:00Z | |
| dc.description | We study the effects of the ionizing and dissociating photons produced by PopIII objects on the surrounding intergalactic medium. We find that the typical size of a H_2 photodissociated region, R_d ~ 1-5 kpc, is smaller than the mean distance between sources at z ~ 20-30, but larger than the ionized region by a factor depending on the detailed properties of the emission spectrum. This implies that clearing of 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 ~ 1d-30 - 1d-27 erg cm^{-2} s^{-1} Hz^{-1}. This value is well below the threshold required for the negative feedback of PopIII objects on the subsequent galaxy formation to be effective in that redshift range. | |
| dc.description | 13 pages, 7 figures; accepted for publication in ApJ. Final version with minor modifications of Fig. 5 & 6 | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9811137 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9811137 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/13299 | |
| dc.subject | Astrophysics | |
| dc.title | Intergalactic H_2 Photodissociation and the Soft UV Background Produced by Population III Objects | |
| dc.type | text |