Table 2.

Estimation of maximum fraction of Lyα surface brightness due to the Cosmic UV background in the five groups with high confidence diffuse emission.

ID z SBdif R
2 3.07 7.17 8.08 8.96 8.12 ± 0.68 2.03 ± 0.17 2.02 28
5 3.18 5.16 7.75 8.64 7.93 ± 0.66 1.78 ± 0.15 1.74 34
17 4.27 4.46 5.19 6.17 9.22 ± 1.05 0.82 ± 0.09 0.46 10
18 4.47 3.69 4.89 5.80 9.53 ± 1.22 0.73 ± 0.09 0.37 10
19 4.51 4.90 4.84 5.73 9.50 ± 1.26 0.70 ± 0.09 0.36 7

Notes. ID: Group ID. z: redshift. SBdif: Average surface brightness of the diffuse Lyα emission in units of 10−20 erg s−1 cm−2 arcsec−2. : Photoionization rate of neutral hydrogen from src, in units of 10−13 s−1; src takes the following values: HM (Haardt & Madau 2012), FG (Faucher-Giguère 2020), BB (Becker & Bolton 2013) : Expected Lyα surface brightness from the UV background in units of 10−20 erg s−1 cm−2 arcsec−2. R: relative fraction in %.

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