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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/20.500.12386/28498
Title: Self-generated cosmic-ray confinement in TeV halos: Implications for TeV γ -ray emission and the positron excess
Authors: Evoli, Carmelo
Linden, Tim
MORLINO, GIOVANNI 
Issue Date: 2018
Journal: PHYSICAL REVIEW D 
Number: 98
Issue: 6
First Page: 063017
Abstract: Recent observations have detected extended TeV γ -ray emission surrounding young and middle-aged pulsars. The morphology of these "TeV halos" requires cosmic-ray diffusion to be locally suppressed by a factor of ∼100 - 1000 compared to the typical interstellar medium. No model currently explains this suppression. We show that cosmic-ray self-confinement can significantly inhibit diffusion near pulsars. The steep cosmic-ray gradient generates Alfvén waves that resonantly scatter the same cosmic-ray population, suppressing diffusion within ∼20 pc of young pulsars (≲100 kyr ). In this model, TeV halos evolve through two phases, a growth phase where Alfvén waves are resonantly generated and cosmic-ray diffusion becomes increasingly suppressed, and a subsequent relaxation phase where the diffusion coefficient returns to the standard interstellar value. Intriguingly, cosmic rays are not strongly confined early in the TeV halo evolution, allowing a significant fraction of injected e<SUP>±</SUP> to escape. If these e<SUP>±</SUP> also escape from the surrounding supernova remnant, they would provide a natural explanation for the positron excess observed by PAMELA and AMS-02. Recently created TeV cosmic rays are confined in the TeV halo, matching observations by HAWC and H.E.S.S. While our default model relaxes too rapidly to explain the confinement of TeV cosmic rays around mature pulsars, such as Geminga, models utilizing a Kraichnan turbulence spectrum experience much slower relaxation. Thus, observations of TeV halos around mature pulsars may provide a probe into our understanding of interstellar turbulence.
URI: http://hdl.handle.net/20.500.12386/28498
URL: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.98.063017
ISSN: 2470-0010
DOI: 10.1103/PhysRevD.98.063017
Bibcode ADS: 2018PhRvD..98f3017E
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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