MUSE searches for galaxies near very metal-poor gas clouds at z~3: new constraints for cold accretion models

Fumagalli, M.; Cantalupo, S.; Dekel, A.; Morris, S.L.; O'Meara, J.M.; Prochaska, J.X.; Theuns, T.

Abstract

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 × 500 kpc2 region centred at the quasar position, we achieve a ≥80 per cent complete spectroscopic survey of continuum-detected galaxies with mR ≤ 25 mag and Lyα emitters with luminosity LLyα ≥ 3 × 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.

Citation

Fumagalli, M., Cantalupo, S., Dekel, A., Morris, S., O'Meara, J., Prochaska, J., & Theuns, T. (2016). MUSE searches for galaxies near very metal-poor gas clouds at z~3: new constraints for cold accretion models. Monthly Notices of the Royal Astronomical Society, 462(2), 1978-1988. https://doi.org/10.1093/mnras/stw1782

• Journal Article Type: Article
• Acceptance Date: Jul 18, 2016
• Online Publication Date: Jul 25, 2016
• Publication Date: Oct 21, 2016
• Deposit Date: Aug 31, 2016
• Publicly Available Date: Aug 31, 2016
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Royal Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 462
• Issue: 2
• Pages: 1978-1988
• DOI: https://doi.org/10.1093/mnras/stw1782
• Public URL: https://durham-repository.worktribe.com/output/1398278