MUSE unravels the ionisation and origin of metal enriched absorbers in the gas halo of a z = 2.92 radio galaxy

We have used the Multi-Unit Spectroscopic Explorer (MUSE) to study the circumgalactic medium (CGM) of a z = 2.92 radio galaxy, MRC 0943-242 by parametrising its emitting and absorbing gas. In both Ly$\alpha$ $\lambda$1216 and He II $\lambda$1640 lines, we observe emission with velocity shifts of $\Delta v \simeq-1000$ km s$^{-1}$ from the systemic redshift of the galaxy... (read more)

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