Wuji Wang

Wuji Wang   (China)


Mapping the circum-galactic medium around high-redshift radio galaxies in 3D

Radio galaxies (obscured type II AGN) are among the most massive and luminous galaxies known at any redshift. They are known to reside in overdense (proto-cluster) environments, have powerful AGN activities and are surrounded by a rich circumgalactic medium (CGM) which links the interstellar medium and intracluster gas. They are basically the only objects in which quasar mode feedback, radio mode feedback AND the host galaxy can be studied simultaneously making them ideal laboratories providing us with crucial insights into the formation and evolution of the most massive early-type galaxies in the Universe at (or near) Cosmic Noon (z~3). The CGM frequently show strong emission and absorption features for both the hydrogen and metal elements.

The overall goal of this PhD thesis is to obtain a complete picture of the complex physical processes in the CGM of high-redshift radio galaxies. These processes constitute of accretion flows feeding the host galaxies with primordial gas from filamentary large-scale structures and/or AGN and stellar feedback.  Using MUSE and ALMA data of a sample of 8 radio galaxies at 2.9<z<4.5, we will carry out a spatially resolved multi-phase study probing the neutral, ionised and molecular gas phases of these sources. The matched resolution optical and submm 3D spectroscopic observation will make a very significant step forward in assessing the morphology,
kinematics and metal content of these remarkable structures, shedding light on some of the key processes driving the formation of the most massive galaxies.

Supervisor:    Dominika Wylezalek   (ARI)

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