Physical properties of the intergalactic medium and the Lyman-alpha absorbing clouds

Details Physical properties of the intergalactic medium and the Lyman-alpha absorbing clouds Physical properties of the intergalactic medium and the Lyman-alpha absorbing clouds

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...268l..63o&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 268, May 15, 1983, p. L63-L68.

Astronomy and Astrophysics

Astrophysics

133

Cosmology, Intergalactic Media, Lyman Alpha Radiation, Quasars, Astronomical Models, Doppler Effect, Line Spectra, Physical Properties, Shock Heating

Scientific paper

Following the interpretation of Sargent et al. (1980) that the Lyman-alpha absorbing systems seen in quasars are due to intergalactic clouds confined by the pressure of a general intergalactic medium, the physical properties of that medium and of the clouds are determined on the basis of a variety of theoretical and observational constraints, with best estimates of the present intergalactic pressure and temperature being P/k = 10 exp -2 + or - 0.2/cu cm and T = 10 exp 4.5 + or - 0.5 K. It is also shown that a model of the intergalactic medium based on UV heating fails and that some explosive events must have occurred which shock-heated the medium during the epoch z = 3-7. Three specific, if difficult, observations are proposed to check the interpretation developed: a search for the He(+) Gunn-Peterson line at 304 A, a better determination of the Doppler width of the normal Lyman-alpha lines, and a search for low equivalent width Lyman-alpha lines.

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