Reionization as a Probe of Cosmology and Early Astrophysics

Details Reionization as a Probe of Cosmology and Early Astrophysics Reionization as a Probe of Cosmology and Early Astrophysics

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.5506v&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #55.06; Bulletin of the American Astronomical Society, Vol. 31, p.1457

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Scientific paper

Observations of high-redshift quasar spectra have revealed that the intergalactic medium is highly ionized up to redshifts of about 5, implying that universal reionization occurred before then. A number of authors have recently investigated reionization by the first stars or quasars through semi-analytic models or numerical simulations. A large number of parameters, both cosmological and astrophysical, describe any specific reionization scenario, e.g, the normalization of the initial power spectrum of density fluctuations, the rate of baryon conversion to stars in early objects, etc. Here, we adopt a semi-analytic model of stellar reionization, quantify how the optical depth to reionization depends on the model's parameters, and combine this with constraints from the microwave background. Given a reionization model, it is also possible to translate limits on cosmological parameters into those on astrophysical parameters, and vice versa.

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