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- W2031403850 abstract "We investigate a method for determining the temperature-density relation of the intergalactic medium (IGM) at z D 2¨4 using quasar absorption-line systems. Using a simple model combined with numerical simulations, we show that there is a lower cutoU in the distribution of column density and line (N H I ) width (b parameter). The location of this cutoU can be used to determine the temperature-density rela- tion (under certain conditions). We describe and test an algorithm to do this. The method works as long as the amplitude of —uctuations on these scales (D100 kpc) is sufficiently large. Models with less power can mimic higher temperatures. A preliminary application is made to data from two quasar lines of sight, and we determine an upper limit to the temperature of the IGM. Finally, we examine the full distribution of b parameters and show that this is completely speci—ed by just two: the temperature of the gas and the amplitude of the power spectrum. Using the temperature upper limit measured with the cutoU method, we derive an upper limit to the amplitude of the power spectrum. The limiting N H I -b uncertainty in this work appears to come from the nonunique nature of Voigt-pro—le —tting. Subject headings: cosmology: theoryintergalactic mediumquasars: absorption lines" @default.
- W2031403850 created "2016-06-24" @default.
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- W2031403850 date "2000-05-01" @default.
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- W2031403850 title "The<i>b</i>Distribution of the Lyα Forest: Probing Cosmology and the Intergalactic Medium" @default.
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- W2031403850 doi "https://doi.org/10.1086/308735" @default.
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