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Verfasst von:Pfrommer, Christoph [VerfasserIn]   i
 Springel, Volker [VerfasserIn]   i
Titel:Simulating gamma-ray emission in star-forming galaxies
Verf.angabe:Christoph Pfrommer, Rüdiger Pakmor, Christine M. Simpson, and Volker Springel
E-Jahr:2017
Jahr:2017 September 25
Umfang:8 S.
Fussnoten:Gesehen am 17.10.2017
Titel Quelle:Enthalten in: The astrophysical journal / 2
Ort Quelle:London : Institute of Physics Publ., 1995
Jahr Quelle:2017
Band/Heft Quelle:847(2017,2) Artikel-Nummer L13, 8 Seiten
ISSN Quelle:2041-8213
Abstract:Star-forming galaxies emit GeV and TeV gamma-rays that are thought to originate from hadronic interactions of cosmic-ray (CR) nuclei with the interstellar medium. To understand the emission, we have used the moving-mesh code Arepo to perform magnetohydrodynamical galaxy formation simulations with self-consistent CR physics. Our galaxy models exhibit a first burst of star formation that injects CRs at supernovae. Once CRs have sufficiently accumulated in our Milky Way-like galaxy, their buoyancy force overcomes the magnetic tension of the toroidal disk field. As field lines open up, they enable anisotropically diffusing CRs to escape into the halo and to accelerate a bubble-like, CR-dominated outflow. However, these bubbles are invisible in our simulated gamma-ray maps of hadronic pion-decay and secondary inverse-Compton emission because of low gas density in the outflows. By adopting a phenomenological relation between star formation rate (SFR) and far-infrared emission and assuming that gamma-rays mainly originate from decaying pions, our simulated galaxies can reproduce the observed tight relation between far-infrared and gamma-ray emission, independent of whether we account for anisotropic CR diffusion. This demonstrates that uncertainties in modeling active CR transport processes only play a minor role in predicting gamma-ray emission from galaxies. We find that in starbursts, most of the CR energy is “calorimetrically” lost to hadronic interactions. In contrast, the gamma-ray emission deviates from this calorimetric property at low SFRs due to adiabatic losses, which cannot be identified in traditional one-zone models.
DOI:doi:10.3847/2041-8213/aa8bb1
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: http://dx.doi.org/10.3847/2041-8213/aa8bb1
 DOI: https://doi.org/10.3847/2041-8213/aa8bb1
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1564473791
Verknüpfungen:→ Zeitschrift

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