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

Abstract

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. I will briefly review what we have learned about the hot CGM based on X-ray observations over the past two decades, and what we still do not know. I will also briefly prospect what may be the foreseeable breakthrough in the next one or two decades with future X-ray missions.

7 pages, 2 figures, 3 tables; AN in press; invited review for the XMM-Newton 2019 science workshop "Astrophysics of Hot Plasma in Extended X-ray Sources"

References in corpus (15)

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• The Search for the Missing Baryons at Low Redshift
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• Probing the Hot X-ray Corona around the Massive Spiral Galaxy, NGC 6753, Using Deep XMM-Newton observations
• CHANG-ES XV: Large-scale magnetic field reversals in the radio halo of NGC 4631
• Spectral Modeling of the Charge-Exchange X-ray Emission from M82
• CHANG-ES XIV: Cosmic-ray propagation and magnetic field strengths in the radio halo of NGC 4631
• The Circum-Galactic Medium of MASsive Spirals I: Overview and a Case Study of NGC 5908

Cited by in corpus (5)

• X-ray Spectra of Circumgalactic Medium Around Star-Forming Galaxies: Connecting Simulations to Observations
• Scientific Objectives of the Hot Universe Baryon Surveyor (HUBS) Mission
• Probing Hot Gas Components of Circumgalactic Medium in Cosmological Simulations with the Thermal Sunyaev-Zel'dovich Effect
• Tracing the 10${}^7$K Warm-Hot Intergalactic Medium with UV absorption lines
• On the baryon budget in the X-ray-emitting circumgalactic medium of Milky Way-mass galaxies