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- W2589325044 abstract "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." @default.
- W2589325044 created "2017-03-03" @default.
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- W2589325044 date "2004-12-03" @default.
- W2589325044 modified "2023-09-24" @default.
- W2589325044 title "LOFAR as a Probe of Cosmological Reionisation" @default.
- W2589325044 hasPublicationYear "2004" @default.
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