Journal
ASTROPHYSICAL JOURNAL
Volume 551, Issue 1, Pages 48-56Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/320066
Keywords
large-scale structure of universe; methods : numerical; methods : statistical
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We investigate correlations between the long wavelength fluctuations and the small-scale power in the Ly alpha forest. We show that such correlations can be used to discriminate between fluctuations induced by large-scale structure and those produced by nongravitational processes such as fluctuations in the continuum of the quasar. The correlations observed in Q1422+231 are in agreement with the predictions of numerical simulations, indicating that nongravitational fluctuations on large scales have to be small compared to those induced by the large-scale structure of the universe, contributing less than 10% (95% confidence) of the observed power. We also show the sensitivity of such statistics to the equation of state of the gas and its mean temperature.
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