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Cosmic-Ray Propagation in Light of the Recent Observation of Geminga
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). University of Iceland, Iceland.
Number of Authors: 32019 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 879, no 2, article id 91Article in journal (Refereed) Published
Abstract [en]

The High Altitude Water Cherenkov (HAWC) telescope recently observed extended emission around the Geminga and PSR. B0656+14 pulsar wind nebulae (PWNe). These observations have been used to estimate cosmic-ray (CR) diffusion coefficients near the PWNe that appear to be more than two orders of magnitude smaller than the diffusion coefficients typically derived for the interstellar medium from measured abundances of secondary species in CRs. Two-zone diffusion models have been proposed as a solution to this discrepancy, where the slower diffusion zone (SDZ) is confined to a small region around the PWN. Such models are shown to successfully reproduce the HAWC observations of the Geminga PWN while retaining consistency with other CR data. It is found that the size of the SDZ influences the predicted positron flux and the spectral shape of the extended gamma-ray emission at lower energies that can be observed with the Fermi Large Area Telescope. If the two observed PWNe are not unique, then it is likely that there are similar pockets of slow diffusion around many CR sources elsewhere in the Milky Way. The consequences of such a picture for Galactic CR propagation is explored.

Place, publisher, year, edition, pages
2019. Vol. 879, no 2, article id 91
Keywords [en]
astroparticle physics, cosmic rays, diffusion, Galaxy: structure, gamma rays: diffuse background, gamma rays: ISM
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-171748DOI: 10.3847/1538-4357/ab258eISI: 000474921300007OAI: oai:DiVA.org:su-171748DiVA, id: diva2:1349092
Available from: 2019-09-06 Created: 2019-09-06 Last updated: 2019-09-06Bibliographically approved

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Jóhannesson, GuđlaugurMoskalenko, Igor
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