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- W45590018 abstract "We have generalized the classical description of ionization front propagation to the case of a point source in a uniform, cosmologically expanding gas. We present illustrative curves for the comoving radius and peculiar velocity for several turn-on redshifts, z 0N , for Ω tot = 1, Ω b = 0.1, h = 1. The quantity RS is the generalized Strömgren radius [RS = RS i (1 + z 0N )/(1 + z), RS i = (3N u /4πn H,i 2 α 2 ) 1/3 , N u = photoionizing number flux per source, α 2 = recombination rate to n = 2, n H,i = n H o (1 + z 0N ) 3 ]. The quantity T 0N = 2 (1 + z 0N ) −3/2 /(3H 0 ). We also plot ζ, the value of (2n Q o N ph, Q /3H o n H o ) needed to ionize the IGM with overlapping QSO HII regions by redshift z 0V for QSO turn-on at various z 0N , where N ph, Q = ionizing photon luminosity per QSO, n Q o = QSO number density (present co-moving value), n H = H density of IGM, and n H /n H o = n Q /n Q o = (1 + z) 3 . From a recent preprint by Koo (1985), we estimate ζ ≲ 1 (for Ω b = 0.1, h = 1) for QSO's with L ∼ 10 45 erg s −1 . In this case, the observed QSO's cannot be the sole source of the IGM ionization that is implied by the null detection of the Gunn-Peterson effect for QSO's with z > 2." @default.
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- W45590018 date "1987-01-01" @default.
- W45590018 modified "2023-10-18" @default.
- W45590018 title "Cosmological HII Regions" @default.
- W45590018 doi "https://doi.org/10.1017/s0074180900150533" @default.
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