Lyα luminosity functions of the LAEs associated with SBLAs within R ≤ 300 kpc and |Δv| ≤ 300 km s⁻¹. Left panel: Lyα luminosity functions of the LAEs associated with SBLAs identified in the quasar spectra binned to Δv_spec = 69, 138, 276 km s⁻¹ (from light to dark colors). For comparison, we also show the luminosity function expected for LAEs in the field (red, Galbiati et al. 2023) and for those found around strong H I absorbers (green, Lofthouse et al. 2023). Right panel: Posterior distribution of the α and L_★ free parameters obtained fitting the luminosities functions with a Schechter (1976). The contours mark the confidence intervals corresponding to 1σ and 2σ.