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Détections des oscillations acoustiques de baryons grâce aux forêts Lyman-α des spectres de quasars de l'expérience BOSS

Abstract : Baryon acoustic oscillations (BAO) form a standard ruler that can be used to constrain different cosmolo- gical models. This thesis reports the first measurement of the BAO feature in the correlation function of the transmitted flux fraction in the Lyman-α forests of high redshift quasars. This detection uses 89322 quasar spectra measured by the Baryon Oscillation Spectroscopic Survey (BOSS) of the third generation of the Sloan Digital Sky Survey (SDSS-III). Redshift of used quasars belong to the range 2.1 < z < 3.5. A peak in the correlation function is seen at 1.043+0.021−0.020 times the expected BAO peak position for a concordance ΛCDM model. In addition this thesis presents a new method of quasar selection through their variability. This method is applied to the Stripe 82 region where an important number of multi-epoch photometric data is available. On this region it achieves a quasar density of 30 deg−2 to be compared with the 18 deg−2 of usual color selections.
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Contributor : Timothée Delubac <>
Submitted on : Monday, January 27, 2014 - 10:13:04 AM
Last modification on : Monday, February 10, 2020 - 6:12:47 PM
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Timothée Delubac. Détections des oscillations acoustiques de baryons grâce aux forêts Lyman-α des spectres de quasars de l'expérience BOSS. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université Paris-Diderot - Paris VII, 2013. Français. ⟨tel-00936622⟩

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