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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 3 CONTRIBUTI IN ATTI DI CONVEGNO (Proceedings)
  4. 3.01 Contributi in Atti di convegno
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28592
Title: Contribution to diffuse gamma-ray emission coming from self-confined CRs around their Galactic sources
Authors: MORLINO, GIOVANNI 
D'Angelo, M.
Blasi, P.
AMATO, Elena 
Issue Date: 2017
Journal: POS PROCEEDINGS OF SCIENCE 
Volume: 35th International Cosmic Ray Conference (ICRC2017)
Number: 301
First Page: 876
Abstract: Recent observations of the diffuse Galactic gamma-ray emission by the Fermi-LAT satellite have shown significant deviations from models which assume the same diffusion properties for cosmic rays (CR) throughout the Galaxy. We explore the possibility that a fraction of this diffuse Galactic emission could be due to hadronic interactions of CRs self-confined in the region around their sources. In fact, freshly accelerated CRs that diffuse away from the acceleration region can trigger the streaming instability able to amplify magnetic disturbance and to reduce the particle diffusion. When this happen, CRs are trapped in the near source region for a time longer than expected and an extended gamma-ray halo is produces around each source. Here we calculate the contribution to the diffuse gamma-ray background due to the overlap along lines of sight of several of these extended halos. We find that if the density of neutrals is low, the halos can account for a substantial fraction of the diffuse emission observed by Fermi-LAT, depending on the orientation of the line of sight with respect to the direction of the galactic center.
Conference Name: 35th International Cosmic Ray Conference (ICRC2017)
Conference Place: Bexco, Busan, Korea
Conference Date: 10-20 July, 2017
URI: http://hdl.handle.net/20.500.12386/28592
URL: https://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=301
https://pos.sissa.it/301/876/
ISSN: 1824-8039
DOI: 10.22323/1.301.0876
Bibcode ADS: 2017ICRC...35..876M
Fulltext: open
Appears in Collections:3.01 Contributi in Atti di convegno

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