Abstract
Estimates of the ambient ultraviolet ionizing background from modeling of the observed deficit of Lyα forest lines near quasars (the “proximity effect”) are reviewed, including new results from a survey carried out at the Multiple Mirror Telescope. The observed evolution of Lyα forest clouds atz ~ 1.6-4 cannot be reproduced by the evolution in the ultraviolet background implied by the proximity effect measurements, for either the cold-dark-matter minihalo or IGM pressure-confined clouds in their simplest forms. Sources of uncertainty in the ultraviolet background estimates from the proximity effect are discussed.
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Bechtold, J. (1995). The Proximity Effect. In: Meylan, G. (eds) QSO Absorption Lines. ESO Astrophysics Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-49458-4_59
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