Equation of state of the intergalactic medium in the early Universe

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 - 1...

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Bibliographic Details
Published in:Journal of physics. Conference series 2018-06, Vol.1038 (1), p.12015
Main Authors: Telikova, K N, Balashev, S A, Shternin, P S
Format: Article
Language:English
Subjects:
Equations of state
Intergalactic media
Physics
Quasars
Red shift
Signal to noise ratio
Spectrum analysis
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Summary: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.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1038/1/012015