Connecting CGM enrichment with Lyman α emitters at 2.9 < z < 6.7

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ID: 314532
2026
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Abstract
Abstract We present the results of a blind search for Lyman α emitters (LAEs) in three deep archival z ~ 6 quasar fields from VLT/MUSE using state-of-the-art detection algorithms. We explore their connection with absorbers-particularly C iv and Mg ii-in the circumgalactic medium (CGM) from the E-XQR-30 survey. We detect 156 LAEs at 2.9 < z < 6.7 with luminosities ranging from log L[ergs−1] = 41.3 to 43.2. We find 34 and 14 galaxy associations with C iv and Mg ii absorption respectively at 3.4 < z < 5.8 within a line of sight velocity window of ±1000 km−1 and impact parameter of <250 pkpc. These systems have a weak anti-correlation with respect to the absorber strength-impact parameter relation. No Mg ii systems are found within the virial radii of any LAE while four C iv absorbers are located within the virial radii of an LAE suggesting that low ionisation gas has a lower covering fraction. The LAEs have mild overdensity ratios of 1.7 and 1.9 around C iv and Mg ii respectively. The stellar mass upper limits of log M* < 10.7 M⊙ estimated using Keck/NIRC2 imaging indicate that a low-mass, faint population of galaxies pollutes the CGM with metals. This paper serves as a pilot analysis for the forthcoming REQUIEM survey, an ESO Large Program on high redshift deep quasar fields.
Reference Key
openalex_W7161993524 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Alma Maria Sebastian, Emma Ryan-Weber, R. L. Davies, Romain A Meyer, Valentina D’Odorico
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag954
URL
https://doi.org/10.1093/mnras/stag954
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