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Verfasst von:Simpson, Christine M. [VerfasserIn]   i
 Pakmor, Rüdiger [VerfasserIn]   i
 Pfrommer, Christoph [VerfasserIn]   i
 Glover, Simon [VerfasserIn]   i
 Smith, Rowan [VerfasserIn]   i
Titel:How cosmic rays mediate the evolution of the interstellar medium
Verf.angabe:Christine M. Simpson, Rüdiger Pakmor, Christoph Pfrommer, Simon C.O. Glover and Rowan Smith
E-Jahr:2023
Jahr:April 2023
Umfang:25$t25
Fussnoten:Veröffentlicht: 19. Dezember 2022 ; Gesehen am 25.04.2023
Titel Quelle:Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
Ort Quelle:Oxford : Oxford Univ. Press, 1827
Jahr Quelle:2023
Band/Heft Quelle:520(2023), 3 vom: Apr., Seite 4621-4645
ISSN Quelle:1365-2966
Abstract:We explore the impact of diffusive cosmic rays (CRs) on the evolution of the interstellar medium (ISM) under varying assumptions of supernova explosion environment. In practice, we systematically vary the relative fractions of supernovae (SN) occurring in star-forming high-density gas and those occurring in random locations decoupled from star-forming gas to account for SN from run-away stars or explosions in regions that have been cleared by prior SN, stellar winds, or radiation. We find that in the simple system of a periodic stratified gas layer the ISM structure will evolve to one of two solutions: a ‘peak driving’ state where warm gas is volume filling or a ‘thermal runaway’ state where hot gas is volume filling. CR pressure and transport are important factors that strongly influence the solution state the ISM reaches and have the ability to flip the ISM between solutions. Observable signatures such as gamma-ray emission and H i gas are explored. We find that gamma-ray luminosity from pion decay is largely consistent with observations for a range of model parameters. The thickness of the H i gas layer may be too compact, however, this may be due to a large cold neutral fraction of mid-plane gas. The volume fraction of hot gas evolves to stable states in both solutions, but neither settles to a Milky Way-like configuration, suggesting that additional physics omitted here (e.g. a cosmological circumgalactic medium, radiation transport, or spectrally resolved and spatially varying CR transport) may be required.
DOI:doi:10.1093/mnras/stac3601
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.1093/mnras/stac3601
 DOI: https://doi.org/10.1093/mnras/stac3601
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1843500760
Verknüpfungen:→ Zeitschrift

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