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We use 28 quasar fields with high-resolution (HIRES and UVES) spectroscopyfrom the MUSE Analysis of Gas Around Galaxies survey to study the connectionbetween Ly${\alpha}$ emitters (LAEs) and metal-enriched ionized gas traced byCIV in absorption at redshift $z\approx3-4$. In a sample of 220 CIV absorbers,we identify 143 LAEs connected to CIV gas within a line-of-sight separation${\rm \pm 500\,km\,s^{-1}}$, equal to a detection rate of $36\pm 5$ per centonce we account for multiple LAEs connected to the same CIV absorber. Theluminosity function of LAEs associated with CIV absorbers shows a $\approx 2.4$higher normalization factor compared to the field. CIV with higher equivalentwidth and velocity width are associated with brighter LAEs or multiplegalaxies, while weaker systems are less often identified near LAEs. Thecovering fraction in groups is up to $\approx 3$ times larger than for isolatedgalaxies. Compared to the correlation between optically-thick HI absorbers andLAEs, CIV systems are twice less likely to be found near LAEs especially atlower equivalent width. Similar results are found using SiIV as tracer ofionized gas. We propose three components to model the gas environment of LAEs:i) the circumgalactic medium of galaxies, accounting for the strongestcorrelations between absorption and emission; ii) overdense gas filamentsconnecting galaxies, driving the excess of LAEs at a few times the virialradius and the modulation of the luminosity and cross-correlation functions forstrong absorbers; iii) an enriched and more diffuse medium, accounting forweaker CIV absorbers farther from galaxies.

monthly notices of the royal astronomical society

MUSE Analysis of Gas around Galaxies (MAGG) -- V: Linking ionized gas  traced by CIV and SiIV absorbers to Ly${\alpha}$ emitting galaxies at  $z\approx 3.0-4.5$