Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.161...47l&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 161, no. 1, Nov. 1989, p. 47-59. Research supported by the Chinese Nationa
Astronomy and Astrophysics
Astrophysics
Gravitational Effects, Intergalactic Media, Interstellar Gas, Lyman Alpha Radiation, Physical Properties, Quasars, Gas Ionization, Optical Thickness, Photoionization, Red Shift, Thermodynamic Equilibrium, Ultraviolet Radiation
Scientific paper
The physical state of optically thin, primordial gas in intergalactic space at redshift about Z = 2.5 is re-examined, assuming the gas is in ionization and thermal equilibrium by the integrated UV flux from QSOs. For densities in the range 0.00001 to 0.01/cu cm, the structure of the gas can be well described by an isothermal polytrope of infinite index. The L-alpha absorbing clouds observed in the spectra of distant QSOs may arise in such self-gravitating intergalactic clouds. Some properties of the clouds are discussed with reference to recent observations and equilibrium models.
Chen Jian-Sheng
Liu Xiao-Wei
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