The Evolution of the He II-ionizing Background at Redshifts 2.3 < z < 3.8 Inferred from a Statistical Sample of 24 HST/COS He II Lyα Absorption Spectra

Recommended citation: Worseck, G., Davies, F. B., Hennawi, J. F., et al. (2019). "The Evolution of the He II-ionizing Background at Redshifts 2.3 < z < 3.8 Inferred from a Statistical Sample of 24 HST/COS He II Lyα Absorption Spectra." The Astrophysical Journal, 875, 111.
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