An X-ray View of the Hot Circum-Galactic Medium

Understand

The hot circum-galactic medium (CGM) represents the hot gas distributed beyond the stellar content of the galaxies while typically within their dark matter halos.

• It serves as a depository of energy and metal-enriched materials from galactic feedback and a reservoir from which the galaxy acquires fuels to form stars.
• It thus plays a critical role in the coevolution of galaxies and their environments.
• X-rays are one of the best ways to trace the hot CGM.