HI photo-ionization rate Γ−12 produced by AGN at z ~ 4.
|Luminosity Function||Γ −12||Γ−12|
|M1450 ≤ −23||M1450 ≤ −18|
|Glikman et al. (2011)||0.140 (16.5%)||0.307 (36.3%)|
|Giallongo et al. (2015)||0.208 (24.6%)||0.617 (72.9%)|
|Akiyama et al. (2018)||0.113 (13.4%)||0.135 (15.9%)|
|Parsa et al. (2018)||0.088 (10.4%)||0.255 (30.0%)|
Notes.The LyC escape fraction fesc(LyC) is fixed to 75% in the luminosity range − 28 ≤ M1450 ≤ −18. In parenthesis we compute the fraction of the UVB with respect to the value of Γ −12 =0.85 provided by BB13 at z = 4. The luminosity functions of Glikman et al. (2011) and Akiyama et al. (2018) have magnitude limits which are significantly brighter than the adopted integration limit M1450 = −18 and are extrapolated. The Giallongo et al. (2015) and Parsa et al. (2018) luminosity functions instead provide an estimate of the AGN space density close to the adopted integration limit of M1450 = −18.
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