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- W9699470 abstract "High-redshift QSOs are prodigious sources of ultraviolet photons which may influence the ionization and thermal history of the diffuse intergalactic medium and the Lyα forest clouds. Recent results on the ambient, metagalactic ultraviolet radiation field as a function of redshift are reviewed. At z = 0, searches for Hα emission from 21-cm emitting clouds, modeling of the sharp edges of H I clouds, and direct measurements of the far ultraviolet flux at high Galactic latitude place limits on any diffuse extragalactic component. At z ≈ 3, the ambient background can be estimated through studies of the Lyα forest and other types of QSO absorption-line systems. Estimates of the ultraviolet background obtained through modeling of the “proximity effect” in the Lyα forest at z ≈ 3 probably are in reasonable agreement with the expected contribution of luminous QSOs, when the large uncertainties in both quantities are taken into account." @default.
- W9699470 created "2016-06-24" @default.
- W9699470 creator A5085166858 @default.
- W9699470 date "1993-01-01" @default.
- W9699470 modified "2023-09-23" @default.
- W9699470 title "The First QSOs and Their Influence on the Intergalactic Medium" @default.
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- W9699470 doi "https://doi.org/10.1007/978-94-011-1882-8_28" @default.
- W9699470 hasPublicationYear "1993" @default.
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