Pressure-confined Lyman-alpha clouds

Details Pressure-confined Lyman-alpha clouds Pressure-confined Lyman-alpha clouds

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...337..609b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 337, Feb. 15, 1989, p. 609-616. Research supported by the Alfred P. Sloan F

Astronomy and Astrophysics

Astrophysics

17

Absorption Spectra, Lyman Alpha Radiation, Molecular Clouds, Quasars, Gravitational Collapse, Line Spectra, Red Shift, Spectral Line Width, Temperature Distribution, Thermal Instability

Scientific paper

Results are presented of numerical models of pressure-confined spherical gas clouds which produce absorption resembling the low to intermediate atomic column density lines found in high-redshift QSO spectra. One-dimensional hydrodynamical models including electron conduction are described, and the rate equations are solved to find ionization and excitation states. Results are presented for both static and adiabatically expanding confining media covering a range of initial pressures. It is found that Ly-alpha lines are very similar over a wide range of conditions and that the most promising diagnostic of pressure is to compare the column density in H I to that in He I and He II. No single-pressure model can explain the wide range of observed H I column densities.

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