Abstract
The \(Ly_{\alpha}\) forest observed in the spectra of quasars allows the evolution of the structure of the Universe and the properties of the ultraviolet (UV) background up to redshifts \({\sim}\)6 to be studied. An analysis of the properties of \({\sim}\)6000 \(Ly_{\alpha}\) forest lines observed at redshifts \(4.5\geq z\geq 2\) shows that this forest can be formed by the absorption of radiation from quasars by strongly ionized hydrogen concentrated in dark matter (DM) halos and the intergalactic medium. We propose a physical model of absorbers that allows the observed characteristics of absorption lines to be associated with the properties of DM halos and the surrounding UV background. We show that the Doppler parameter and the gas temperature are determined by the injection energy being released during hydrogen photoionization and depend only on the spectrum of the surrounding UV background. In contrast, the observed number density of neutral hydrogen depends both on the intensity and spectrum of the UV background and on the mass and density of the DM halos. Our analysis can be used to distinguish the limited population of DM halos observed as \(Ly_{\alpha}\) lines among the set of all DM halos.
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Demiański, M.I., Doroshkevich, A.G. & Larchenkova, T.I. The Lyman-Alpha Forest and the Ultraviolet Background. Astron. Lett. 48, 361–369 (2022). https://doi.org/10.1134/S1063773722070040
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DOI: https://doi.org/10.1134/S1063773722070040