Are Lyman-alpha clouds non-spherical?

Details Are Lyman-alpha clouds non-spherical? Are Lyman-alpha clouds non-spherical?

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.224..675b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 224, Feb. 1, 1987, p. 675-684. Research supported by th

Astronomy and Astrophysics

Astronomy

25

Absorption Spectra, Hydrogen Clouds, Intergalactic Media, Lyman Alpha Radiation, Quasars, X Ray Astronomy, Background Radiation

Scientific paper

A model for the clouds responsible for Lyman α absorption against distant quasars is presented in which the shape of the clouds is highly spheroidal instead of spherical. This gives a simple interpretation for the observed distribution of column densities at a given redshift found by Carswell, Webb, Baldwin & Atwood (1986). Pressure equilibrium of the clouds with a hot intergalactic medium dense enough to account for the X-ray background is only possible if the clouds are either (1) maintained at around 105K, (2) only observed as they cool through 105K or (3) physically small, with a transverse size of a few pc.

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