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https://hdl.handle.net/2440/92576
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dc.contributor.author | Abramowski, A. | - |
dc.contributor.author | Aharonian, F. | - |
dc.contributor.author | Ait Benkhali, F. | - |
dc.contributor.author | Akhperjanian, A. | - |
dc.contributor.author | Angüner, E. | - |
dc.contributor.author | Backes, M. | - |
dc.contributor.author | Balenderan, S. | - |
dc.contributor.author | Balzer, A. | - |
dc.contributor.author | Barnacka, A. | - |
dc.contributor.author | Becherini, Y. | - |
dc.contributor.author | Becker Tjus, J. | - |
dc.contributor.author | Berge, D. | - |
dc.contributor.author | Bernhard, S. | - |
dc.contributor.author | Bernlöhr, K. | - |
dc.contributor.author | Birsin, E. | - |
dc.contributor.author | Biteau, J. | - |
dc.contributor.author | Böttcher, M. | - |
dc.contributor.author | Boisson, C. | - |
dc.contributor.author | Bolmont, J. | - |
dc.contributor.author | Bordas, P. | - |
dc.contributor.author | et al. | - |
dc.date.issued | 2014 | - |
dc.identifier.citation | Letters of the Astrophysical Journal, 2014; 794(1):L1-1-L1-6 | - |
dc.identifier.issn | 2041-8205 | - |
dc.identifier.issn | 2041-8213 | - |
dc.identifier.uri | http://hdl.handle.net/2440/92576 | - |
dc.description.abstract | This Letter reports the discovery of a remarkably hard spectrum source, HESS J1641-463, by the High Energy Stereoscopic System (H.E.S.S.) in the very high energy (VHE) domain. HESS J1641-463 remained unnoticed by the usual analysis techniques due to confusion with the bright nearby source HESS J1640-465. It emerged at a significance level of 8.5 standard deviations after restricting the analysis to events with energies above 4 TeV. It shows a moderate flux level of φ(E>1 TeV) = (3.64 ± 0.44stat ± 0.73sys) × 10-13 cm-2 s-1, corresponding to 1.8% of the Crab Nebula flux above the same energy, and a hard spectrum with a photon index of Γ = 2.07 ± 0.11stat ± 0.20sys. It is a point-like source, although an extension up to a Gaussian width of σ = 3 arcmin cannot be discounted due to uncertainties in the H.E.S.S. point-spread function. The VHE γ-ray flux of HESS J1641-463 is found to be constant over the observed period when checking time binnings from the year-by-year to the 28 minute exposure timescales. HESS J1641-463 is positionally coincident with the radio supernova remnant SNR G338.5+0.1. No X-ray candidate stands out as a clear association; however, Chandra and XMM-Newton data reveal some potential weak counterparts. Various VHE γ-ray production scenarios are discussed. If the emission from HESS J1641-463 is produced by cosmic ray protons colliding with the ambient gas, then their spectrum must extend close to 1 PeV. This object may represent a source population contributing significantly to the galactic cosmic ray flux around the knee. | - |
dc.description.statementofresponsibility | A. Abramowski ... P. deWilt ... J. Lau ... G. Rowell ... et al. (H.E.S.S. Collaboration) | - |
dc.language.iso | en | - |
dc.publisher | Institute of Physics Publishing | - |
dc.rights | © 2014. The American Astronomical Society. All rights reserved. | - |
dc.source.uri | http://dx.doi.org/10.1088/2041-8205/794/1/l1 | - |
dc.subject | cosmic rays; gamma rays: general; ISM: individual objects (SNR G338.3–0.0, SNR G338.5+0.1) | - |
dc.title | Discovery of the hard spectrum VHE γ-ray source HESS J1641-463 | - |
dc.title.alternative | Discovery of the hard spectrum VHE gamma-ray source HESS J1641-463 | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1088/2041-8205/794/1/L1 | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Rowell, G. [0000-0002-9516-1581] | - |
Appears in Collections: | Aurora harvest 7 IPAS publications |
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