Equilibrium slab models of Lyman-alpha clouds

Details Equilibrium slab models of Lyman-alpha clouds Equilibrium slab models of Lyman-alpha clouds

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...402..493c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 402, no. 2, p. 493-513.

Astronomy and Astrophysics

Astrophysics

35

Astronomical Models, Lyman Alpha Radiation, Quasars, Absorption Spectra, Dark Matter, Hubble Space Telescope, Photoionization, Radiation Distribution

Scientific paper

Solutions for the equilibrium configuration of a slab with ionizing radiation incident equally from both sides are explored. Radiation effects (photoionization, Ly-alpha photon trapping, and mock gravity) as well as external pressure and self gravity (with and without dark matter) are included. The general formalism is applied to structure growth on small scales at very high z due to mock gravity on dust. Emphasis is placed on the application of slab models at z of less than 5, particularly those that may correspond to Ly-alpha forest, Lyman limit, and damped Ly-alpha systems. The regime with a dominant outward force contributed by trapping of Ly-alpha photons is discussed. General expressions are given for the equilibrium, including dark matter, assuming various relationships between the density of the dark matter halo and the total gas column density.

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