Abstract
Spectroscopy of the Lya forest in quasar spectra proved to be a useful tool for probing the intergalactic gas. We developed the automatic program for Voigt profile fitting of Lya forest lines. We run this code on 9 high resolution (∼ 50000) quasars spectra with a high signal-to-noise ratio (∼ 50 — 100) from the Keck telescope archive and obtained the sample of single well-fitted Lya lines. Fitting the joint 2d distribution of column density and Doppler parameter from this sample by physically reasonable model we estimate a power law index, γ, of the equation of state of the intergalactic medium in the redshift range z ∼ 2 — 3. We found that our measurement is in an agreement with measurements by other groups obtained with Voigt profile fitting technique.
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