2016MNRAS.462.1978F

We report on the search for galaxies in the proximity of two very metal-poor gas clouds at z ∼ 3 towards the quasar Q0956+122. With a 5-hour Multi-Unit Spectroscopic Explorer (MUSE) integration in a ∼500 x 500 kpc² region centred at the quasar position, we achieve a >=80 per cent complete spectroscopic survey of continuum-detected galaxies with m_R <= 25 mag and Lyα emitters with luminosity L_Lyα >= 3 x 10⁴¹ erg s^- 1^. We do not identify galaxies at the redshift of a z ∼ 3.2 Lyman limit system (LLS) with log Z/Z_☉ = -3.35 ± 0.05, placing this gas cloud in the intergalactic medium or circumgalactic medium of a galaxy below our sensitivity limits. Conversely, we detect five Lyα emitters at the redshift of a pristine z ∼ 3.1 LLS with log Z/Z_☉ <= -3.8, while ∼0.4 sources were expected given the z ∼ 3 Lyα luminosity function. Both this high detection rate and the fact that at least three emitters appear aligned in projection with the LLS suggest that this pristine cloud is tracing a gas filament that is feeding one or multiple galaxies. Our observations uncover two different environments for metal-poor LLSs, implying a complex link between these absorbers and galaxy haloes, which ongoing MUSE surveys will soon explore in detail. Moreover, in agreement with recent MUSE observations, we detected a ∼ 90 kpc Lyα nebula at the quasar redshift and three Lyα emitters reminiscent of a 'dark galaxy' population.