Possible evidence for the stochastic acceleration of secondary antiprotons by supernova remnants
Abstract
In this paper, the antiproton-to-proton ratio in the cosmic-ray spectrum is a sensitive probe of new physics. Using recent measurements of the cosmic-ray antiproton and proton fluxes in the energy range of 1–1000 GeV, we study the contribution to the $$\bar{p}$$/p ratio from secondary antiprotons that are produced and subsequently accelerated within individual supernova remnants. We consider several well-motivated models for cosmic-ray propagation in the interstellar medium and marginalize our results over the uncertainties related to the antiproton production cross section and the time-, charge-, and energy-dependent effects of solar modulation. We find that the increase in the $$\bar{p}$$/p ratio observed at rigidities above ~100 GV cannot be accounted for within the context of conventional cosmic-ray propagation models, but is consistent with scenarios in which cosmic-ray antiprotons are produced and subsequently accelerated by shocks within a given supernova remnant. In light of this, the acceleration of secondary cosmic rays in supernova remnants is predicted to substantially contribute to the cosmic-ray positron spectrum, accounting for a significant fraction of the observed positron excess.
- Authors:
-
- The Johns Hopkins Univ., Baltimore, MD (United States)
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)
- The Ohio State Univ., Columbus, OH (United States)
- Publication Date:
- Research Org.:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1345609
- Alternate Identifier(s):
- OSTI ID: 1363982
- Report Number(s):
- FERMILAB-PUB-17-010-A; arXiv:1701.04406
Journal ID: ISSN 2470-0010; PRVDAQ; 1509337
- Grant/Contract Number:
- AC02-07CH11359; FG02-13ER41958; SC0009924
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 95; Journal Issue: 12; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Cholis, Ilias, Hooper, Dan, and Linden, Tim. Possible evidence for the stochastic acceleration of secondary antiprotons by supernova remnants. United States: N. p., 2017.
Web. doi:10.1103/PhysRevD.95.123007.
Cholis, Ilias, Hooper, Dan, & Linden, Tim. Possible evidence for the stochastic acceleration of secondary antiprotons by supernova remnants. United States. https://doi.org/10.1103/PhysRevD.95.123007
Cholis, Ilias, Hooper, Dan, and Linden, Tim. Wed .
"Possible evidence for the stochastic acceleration of secondary antiprotons by supernova remnants". United States. https://doi.org/10.1103/PhysRevD.95.123007. https://www.osti.gov/servlets/purl/1345609.
@article{osti_1345609,
title = {Possible evidence for the stochastic acceleration of secondary antiprotons by supernova remnants},
author = {Cholis, Ilias and Hooper, Dan and Linden, Tim},
abstractNote = {In this paper, the antiproton-to-proton ratio in the cosmic-ray spectrum is a sensitive probe of new physics. Using recent measurements of the cosmic-ray antiproton and proton fluxes in the energy range of 1–1000 GeV, we study the contribution to the $\bar{p}$/p ratio from secondary antiprotons that are produced and subsequently accelerated within individual supernova remnants. We consider several well-motivated models for cosmic-ray propagation in the interstellar medium and marginalize our results over the uncertainties related to the antiproton production cross section and the time-, charge-, and energy-dependent effects of solar modulation. We find that the increase in the $\bar{p}$/p ratio observed at rigidities above ~100 GV cannot be accounted for within the context of conventional cosmic-ray propagation models, but is consistent with scenarios in which cosmic-ray antiprotons are produced and subsequently accelerated by shocks within a given supernova remnant. In light of this, the acceleration of secondary cosmic rays in supernova remnants is predicted to substantially contribute to the cosmic-ray positron spectrum, accounting for a significant fraction of the observed positron excess.},
doi = {10.1103/PhysRevD.95.123007},
journal = {Physical Review D},
number = 12,
volume = 95,
place = {United States},
year = {Wed Jun 14 00:00:00 EDT 2017},
month = {Wed Jun 14 00:00:00 EDT 2017}
}
Web of Science
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