Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/126439
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dc.contributor.author | Aartsen, M.G. | - |
dc.contributor.author | Ackermann, M. | - |
dc.contributor.author | Adams, J. | - |
dc.contributor.author | Aguilar, J.A. | - |
dc.contributor.author | Ahlers, M. | - |
dc.contributor.author | Ahrens, M. | - |
dc.contributor.author | Alispach, C. | - |
dc.contributor.author | Andeen, K. | - |
dc.contributor.author | Anderson, T. | - |
dc.contributor.author | Ansseau, I. | - |
dc.contributor.author | Anton, G. | - |
dc.contributor.author | Argüelles, C. | - |
dc.contributor.author | Auffenberg, J. | - |
dc.contributor.author | Axani, S. | - |
dc.contributor.author | Backes, P. | - |
dc.contributor.author | Bagherpour, H. | - |
dc.contributor.author | Bai, X. | - |
dc.contributor.author | Balagopal, A.V. | - |
dc.contributor.author | Barbano, A. | - |
dc.contributor.author | Barwick, S.W. | - |
dc.contributor.author | et al. | - |
dc.date.issued | 2020 | - |
dc.identifier.citation | The Astrophysical Journal: an international review of astronomy and astronomical physics, 2020; 891(1):9-1-9-16 | - |
dc.identifier.issn | 0004-637X | - |
dc.identifier.issn | 1538-4357 | - |
dc.identifier.uri | http://hdl.handle.net/2440/126439 | - |
dc.description.abstract | The measurement of diffuse PeV gamma-ray emission from the Galactic plane would provide information about the energy spectrum and propagation of Galactic cosmic rays, and the detection of a pointlike source of PeV gamma-rays would be strong evidence for a Galactic source capable of accelerating cosmic rays up to at least a few PeV. This paper presents several unbinned maximum-likelihood searches for PeV gamma-rays in the Southern Hemisphere using 5 yr of data from the IceTop air shower surface detector and the in-ice array of the IceCube Observatory. The combination of both detectors takes advantage of the low muon content and deep shower maximum of gamma-ray air showers and provides excellent sensitivity to gamma-rays between ~0.6 and 100 PeV. Our measurements of pointlike and diffuse Galactic emission of PeV gamma-rays are consistent with the background, so we constrain the angle-integrated diffuse gamma-ray flux from the Galactic plane at 2 PeV to 2.61 × 10⁻¹⁹ cm⁻² s⁻¹ TeV⁻¹ at 90% confidence, assuming an E⁻³ spectrum, and we estimate 90% upper limits on pointlike emission at 2 PeV between 10⁻²¹ and 10⁻²⁰ cm⁻² s⁻¹ TeV⁻¹ for an E⁻² spectrum, depending on decl. Furthermore, we exclude unbroken power-law emission up to 2 PeV for several TeV gamma-ray sources observed by the High Energy Spectroscopic System and calculate upper limits on the energy cutoffs of these sources at 90% confidence. We also find no PeV gamma-rays correlated with neutrinos from IceCube's high-energy starting event sample. These are currently the strongest constraints on PeV gamma-ray emission. | - |
dc.description.statementofresponsibility | M.G. Aartsen … G.C. Hill … A. Kyriacou … A. Wallace … B.J. Whelan … et al. [the IceCube Collaboration] | - |
dc.language.iso | en | - |
dc.publisher | IOP Publishing | - |
dc.rights | © 2020. The American Astronomical Society. All rights reserved. | - |
dc.source.uri | http://dx.doi.org/10.3847/1538-4357/ab6d67 | - |
dc.title | Search for PeV gamma-ray emission from the Southern Hemisphere with 5 yr of data from the IceCube Observatory | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.3847/1538-4357/ab6d67 | - |
dc.relation.grant | ARC | - |
pubs.publication-status | Published | - |
Appears in Collections: | Aurora harvest 4 Physics publications |
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