Sökning: onr:"swepub:oai:DiVA.org:su-109246" > DISCOVERY OF THE HA...
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000 | 11330naa a2203109 4500 | |
001 | oai:DiVA.org:su-109246 | |
003 | SwePub | |
008 | 141117s2014 | |||||||||||000 ||eng| | |
024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1092462 URI |
024 | 7 | a https://doi.org/10.1088/2041-8205/794/1/L12 DOI |
040 | a (SwePub)su | |
041 | a engb eng | |
042 | 9 SwePub | |
072 | 7 | a ref2 swepub-contenttype |
072 | 7 | a art2 swepub-publicationtype |
100 | 1 | a Abramowski, A.4 aut |
245 | 1 0 | a DISCOVERY OF THE HARD SPECTRUM VHE gamma-RAY SOURCE HESS J1641-463 |
264 | 1 | c 2014 |
338 | a print2 rdacarrier | |
500 | a AuthorCount:231; | |
520 | a 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 phi(E > 1TeV) = (3.64 +/- 0.44(stat)+/- 0.73(sys)) x 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 Gamma = 2.07 +/- 0.11(stat)+/- 0.20(sys). It is a point-like source, although an extension up to a Gaussian width of sigma = 3 arcmin cannot be discounted due to uncertainties in the H.E.S.S. point-spread function. The VHE gamma-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 gamma-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. | |
650 | 7 | a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe |
650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng |
653 | a cosmic rays | |
653 | a gamma rays: general | |
653 | a ISM: individual objects (SNR G338.3-0.0 | |
653 | a SNR G338.5+0.1) | |
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710 | 2 | a Stockholms universitetb Fysikum4 org |
773 | 0 | t Astrophysical Journal Lettersg 794:1, s. L1-q 794:1<L1-x 2041-8205x 2041-8213 |
856 | 4 | u https://arxiv.org/abs/1408.5280y arXiv:1408.5280 |
856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-109246 |
856 | 4 8 | u https://doi.org/10.1088/2041-8205/794/1/L1 |
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