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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