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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28497
Title: Diffuse gamma-ray emission from self-confined cosmic rays around Galactic sources
Authors: D'Angelo, Marta
MORLINO, GIOVANNI 
AMATO, Elena 
Blasi, Pasquale
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 474
Issue: 2
First Page: 1944
Abstract: The propagation of particles accelerated at supernova remnant shocks and escaping the parent remnants is likely to proceed in a strongly non-linear regime, due to the efficient self-generation of Alfvén waves excited through streaming instability near the sources. Depending on the amount of neutral hydrogen present in the regions around the sites of supernova explosions, cosmic rays may accumulate an appreciable grammage in the same regions and get self-confined for non-negligible times, which in turn results in an enhanced rate of production of secondaries. Here we calculate the contribution to the diffuse gamma-ray background due to the overlap along lines of sight of several of these extended haloes as due to pion production induced by self-confined cosmic rays. We find that if the density of neutrals is low, the haloes can account for a substantial fraction of the diffuse emission observed by Fermi-Large Area Telescope (LAT), depending on the orientation of the line of sight with respect to the direction of the Galactic Centre.
URI: http://hdl.handle.net/20.500.12386/28497
URL: https://academic.oup.com/mnras/article-abstract/474/2/1944/4590049?redirectedFrom=fulltext
ISSN: 0035-8711
DOI: 10.1093/mnras/stx2828
Bibcode ADS: 2018MNRAS.474.1944D
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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1710.10937.pdfpostprint1.2 MBAdobe PDFView/Open
stx2828.pdfPdf editoriale1.19 MBAdobe PDFView/Open
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