LOFAR as a Probe of the Sources of Cosmological Reionisation
| dc.creator | Zaroubi, Saleem | |
| dc.creator | Silk, Joseph | |
| dc.date | 2004-12-03 | |
| dc.date | 2005-04-07 | |
| dc.date.accessioned | 2026-07-07T02:16:08Z | |
| dc.date.available | 2026-07-07T02:16:08Z | |
| dc.description | We propose use of the thickness of the ionisation front as a discriminant between alternative modes of reionisation in the early universe, by stars or by miniquasars. Assuming a photoionisation-recombination balance, we find that for miniquasar sources the transition from neutral to ionised intergalactic medium is extended and has two features. The first is a sudden steep increase in the neutral fraction with a typical width of 5-10 comoving megaparsecs, depending on the miniquasar power. The second feature is a long wing that represents a much slower transition from neutral fraction of $\approx 0.8$ to 1. The angular resolution of LOFAR is expected to resolve these scales and will, therefore, play an important role in discriminating the hard sources of ionising photons from the stellar ones. | |
| dc.description | Replaced to match the accepted version. To be published in MNRAS Letters | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0412080 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0412080 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/8674 | |
| dc.subject | Astrophysics | |
| dc.title | LOFAR as a Probe of the Sources of Cosmological Reionisation | |
| dc.type | text |