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The Limited Contribution of Low- and High-luminosity Gamma-Ray Bursts to Ultra-high-energy Cosmic Rays
KTH, School of Engineering Sciences (SCI), Physics. Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden..
Max Planck Inst Extraterr Phys, Giessenbachstr, D-85748 Garching, Germany..
KTH, School of Engineering Sciences (SCI), Physics. Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden..ORCID iD: 0000-0002-9769-8016
Univ Coll Cork, Dept Phys, Cork, Ireland.;Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel..
2019 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 876, no 2, article id 93Article in journal (Refereed) Published
Abstract [en]

The acceleration site for ultra-high-energy cosmic rays (UHECRs) is still an open question despite extended research. In this paper, we reconsider the prompt phase of gamma-ray bursts (GRBs) as a possible candidate for this acceleration and constrain the maximum proton energy in optically thin synchrotron and photospheric models, using properties of the prompt photon spectra. We find that neither of the models favors acceleration of protons to 10(20) eV in high-luminosity bursts. We repeat the calculations for low-luminosity GRBs (llGRBs) considering both protons and completely stripped iron and find that the highest obtainable energies are < 10(19) eV and < 10(20) eV for protons and iron respectively, regardless of the model. We conclude therefore that for our fiducial parameters, GRBs, including low-luminosity bursts, contribute little to nothing to the UHECRs observed. We further constrain the conditions necessary for an association between UHECRs and llGRBs and find that iron can be accelerated to 1020 eV in photospheric models, given very efficient acceleration and/or a small fractional energy given to a small fraction of accelerated electrons. This will necessarily result in high prompt optical fluxes, and the detection of such a signal could therefore be an indication of successful UHECR acceleration at the source.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 876, no 2, article id 93
Keywords [en]
cosmic rays, gamma-ray burst: general
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-252607DOI: 10.3847/1538-4357/ab153cISI: 000467460700004OAI: oai:DiVA.org:kth-252607DiVA, id: diva2:1321933
Note

QC 20190610

Available from: 2019-06-10 Created: 2019-06-10 Last updated: 2019-06-10Bibliographically approved

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Samuelsson, FilipRyde, Felix

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