LOFAR as a probe of the sources of cosmological reionization

Details LOFAR as a probe of the sources of cosmological reionization LOFAR as a probe of the sources of cosmological reionization

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mnras.360l..64z&link_type=abstract

Monthly Notices of the Royal Astronomical Society: Letters, Volume 360, Issue 1, pp. L64-L67.

Astronomy and Astrophysics

Astronomy

32

Quasars: General, Cosmology: Theory, Diffuse Radiation, Large-Scale Structure Of Universe, Radio Lines: General

Scientific paper

We propose use of the thickness of the ionization front as a discriminant between alternative modes of reionization in the early Universe, by stars or by miniquasars. Assuming a photoionization-recombination balance, we find that for miniquasar sources the transition from neutral to ionized 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 a neutral fraction of ~ 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 ionizing photons from the stellar ones.

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