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Cosmic Ray Processes in Galactic Ecosystems

Owen, Ellis R; Wu, Kinwah; Inoue, Yoshiyuki; Yang, H-Y Karen; Mitchell, Alison MW; (2023) Cosmic Ray Processes in Galactic Ecosystems. Galaxies , 11 (4) , Article 86. 10.3390/galaxies11040086. Green open access

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Abstract

Galaxy evolution is an important topic, and our physical understanding must be complete to establish a correct picture. This includes a thorough treatment of feedback. The effects of thermal–mechanical and radiative feedback have been widely considered; however, cosmic rays (CRs) are also powerful energy carriers in galactic ecosystems. Resolving the capability of CRs to operate as a feedback agent is therefore essential to advance our understanding of the processes regulating galaxies. The effects of CRs are yet to be fully understood, and their complex multi-channel feedback mechanisms operating across the hierarchy of galaxy structures pose a significant technical challenge. This review examines the role of CRs in galaxies, from the scale of molecular clouds to the circumgalactic medium. An overview of their interaction processes, their implications for galaxy evolution, and their observable signatures is provided and their capability to modify the thermal and hydrodynamic configuration of galactic ecosystems is discussed. We present recent advancements in our understanding of CR processes and interpretation of their signatures, and highlight where technical challenges and unresolved questions persist. We discuss how these may be addressed with upcoming opportunities.

Type: Article
Title: Cosmic Ray Processes in Galactic Ecosystems
Open access status: An open access version is available from UCL Discovery
DOI: 10.3390/galaxies11040086
Publisher version: https://doi.org/10.3390/galaxies11040086
Language: English
Additional information: © 2023 by the Authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Keywords: cosmic rays; galaxy formation and evolution; interstellar medium; circumgalactic medium; outflows; inflows; star-formation; molecular clouds; feedback
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10173946
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