Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.6002l&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #60.02; Bulletin of the American Astronomical Society, Vol. 26, p.959
Astronomy and Astrophysics
Astronomy
Scientific paper
A break in the distribution function of Lyalpha clouds (at a typical redshift of 2.5) has been reported by Petitjean et al. (1993). This feature is what would be expected from a transition between pressure confinement and gravity confinement (as predicted in Charlton, Salpeter, and Hogan (1993)). The column density at which the feature occurs has been used to determine the external confining pressure, ~ 10 cm(-3) K, which could be due to a hot, intergalactic medium. For models that provide a good fit to the data, the contribution of the gas in clouds to Omega is small. The specific shape of the distribution function at the transition (predicted by models to have a non-monotonic slope) can serve as a diagnostic of the distribution of dark matter around Lyalpha forest clouds, and the present data already eliminate certain models. \leftline{Charlton, J. C., Salpeter, E. E., & Hogan, C. H. 1993, ApJ, 402, 493}
Charlton Jane C.
Linder Suzanne M.
Salpeter Edwin E.
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