November 9, 2025Open Access

The Multi-Phase Circumgalactic Medium of DESI Emission-Line Galaxies at z~1.5

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Discussion

Analysis shows that variations in stellar mass affect CGM profiles in emission-line galaxies, suggesting distinct gas phases exist.

Mean rest equivalent width profiles increase with stellar mass at specific impact parameters.
The dispersion of MgII and CIV gas velocity offsets ranges from ∼100 km s^{-1} within halos to ∼200 km s^{-1} beyond.
Gas phases traced by MgII and CIV show distinct kinematics and are not tightly coupled.
Findings highlight the complexity of the circumgalactic medium, revealing relationships among different gas components.

Lan et al. (2025) studied this question.

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