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Title:
Reheating of the intergalactic medium at Z greater than 10
Authors:
Couchman, H. M. P.
Publication:
Royal Astronomical Society, Monthly Notices (ISSN 0035-8711), vol. 214, May 1, 1985, p. 137-159. (MNRAS Homepage)
Publication Date:
05/1985
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
COMPUTATIONAL ASTROPHYSICS, GAS IONIZATION, INTERGALACTIC MEDIA, PHOTOIONIZATION, PLASMA HEATING, BARYONS, GAS DENSITY, HYDROGEN, MOLECULAR GASES, RED SHIFT
Bibliographic Code:
1985MNRAS.214..137C

Abstract

The reheating and reionization of the intergalactic medium by photoionizing radiation is considered. It is shown that in a low gas density universe a modest input, even at z ≅ 100, can reionize the gas. The temperature of the intergalactic medium can be significantly affected even if the gas subsequently recombines. Over the range of redshifts considered, 0 ≤ z ≤ 100, the difference is small for gas recombining at z ≡ 100, becoming much larger for small redshifts. The molecular hydrogen abundance after recombination is also calculated. Results are presented for an Ω = 1 universe with Ωg = 0.05, nHe/nH = 1/12 and h0 = 1/2.

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