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Signatures of Recent Cosmic-Ray Acceleration in the High-latitude Gamma-Ray Sky
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). University of Iceland, Iceland.ORCID iD: 0000-0003-1458-7036
Number of Authors: 22021 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 917, no 1, article id 30Article in journal (Refereed) Published
Abstract [en]

Cosmic-ray (CR) sources temporarily enhance the relativistic particle density in their vicinity over the background distribution accumulated from the Galaxy-wide past injection activity and propagation. If individual sources are close enough to the solar system, their localized enhancements may present as features in the measured spectra of the CRs and in the associated secondary electromagnetic emissions. Large-scale loop-like structures visible in the radio sky are possible signatures of such nearby CR sources. If so, these loops may also have counterparts in the high-latitude gamma-ray sky. Using similar to 10 yr of data from the Fermi Large Area Telescope, applying Bayesian analysis including Gaussian Processes, we search for extended enhanced emission associated with putative nearby CR sources in the energy range from 1 GeV to 1 TeV for the sky region divide b divide > 30 degrees. We carefully control the systematic uncertainty due to imperfect knowledge of the interstellar gas distribution. Radio Loop IV is identified for the first time as a gamma-ray emitter, and we also find significant emission from Loop I. Strong evidence is found for asymmetric features about the Galactic l = 0 degrees meridian that may be associated with parts of the so-called Fermi Bubbles, and some evidence is also found for gamma-ray emission from other radio loops. Implications for the CRs producing the features and possible locations of the sources of the emissions are discussed.

Place, publisher, year, edition, pages
2021. Vol. 917, no 1, article id 30
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Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-196969DOI: 10.3847/1538-4357/ac01c9ISI: 000684012800001OAI: oai:DiVA.org:su-196969DiVA, id: diva2:1596835
Available from: 2021-09-23 Created: 2021-09-23 Last updated: 2022-02-25Bibliographically approved

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Jóhannesson, Guðlaugur

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