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dc.contributor.authorAbramowski, A.
dc.contributor.authorCasanova, S.
dc.contributor.authorDe Jager, O.C.
dc.contributor.authorPekeur, N.W.
dc.contributor.authorSheidaei, F.
dc.contributor.authorVenter, C.
dc.contributor.authorVorster, M.
dc.contributor.authorH.E.S.S. Collaboration
dc.date.accessioned2013-11-07T06:40:01Z
dc.date.available2013-11-07T06:40:01Z
dc.date.issued2012
dc.identifier.citationAbramowski, A. et al. 2012. Discovery of gamma-ray emission from the extragalactic pulsar wind nebula N 157B with H.E.S.S. Astronomy & astrophysics, 545:L2. [https://doi.org/10.1051/0004-6361/201219906]en_US
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/9459
dc.identifier.urihttps://doi.org/10.1051/0004-6361/201219906
dc.identifier.urihttps://www.aanda.org/articles/aa/abs/2012/09/aa19906-12/aa19906-12.html
dc.description.abstractWe present the significant detection of the first extragalactic pulsar wind nebula (PWN) detected in gamma rays, N 157B, located in the large Magellanic Cloud (LMC). Pulsars with high spin-down luminosity are found to power energised nebulae that emit gamma rays up to energies of several tens of TeV. N 157B is associated with PSR J0537−6910, which is the pulsar with the highest known spin-down luminosity. The High Energy Stereoscopic System telescope array observed this nebula on a yearly basis from 2004 to 2009 with a dead-time corrected exposure of 46 h. The gamma-ray spectrum between 600 GeV and 12 TeV is well-described by a pure power-law with a photon index of 2.8 ± 0.2stat ± 0.3syst and a normalisation at 1 TeV of (8.2 ± 0.8stat ± 2.5syst) × 10-13 cm-2 s-1 TeV-1. A leptonic multi-wavelength model shows that an energy of about 4 × 1049 erg is stored in electrons and positrons. The apparent efficiency, which is the ratio of the TeV gamma-ray luminosity to the pulsar’s spin-down luminosity, 0.08% ± 0.01%, is comparable to those of PWNe found in the Milky Way. The detection of a PWN at such a large distance is possible due to the pulsar’s favourable spin-down luminosity and a bright infrared photon-field serving as an inverse-Compton-scattering target for accelerated leptons. By applying a calorimetric technique to these observations, the pulsar’s birth period is estimated to be shorter than 10 ms.en_US
dc.language.isoenen_US
dc.publisherEDP Sciences
dc.subjectGamma rays: generalen_US
dc.subjectpulsars: individual: PSR J0537en_US
dc.subject6910en_US
dc.subjectISM: supernova remnantsen_US
dc.subjectmagellanic cloudsen_US
dc.titleDiscovery of gamma-ray emission from the extragalactic pulsar wind nebula N 157B with H.E.S.Sen_US
dc.typeArticleen_US
dc.contributor.researchID12006653 - Venter, Christo
dc.contributor.researchID22050574 - Pekeur, Nicolette Whilna
dc.contributor.researchID23909196 - Casanova, Sabrina
dc.contributor.researchID10065857 - De Jager, Ocker Cornelis
dc.contributor.researchID22164405 - Sheidaei, Farzaneh
dc.contributor.researchID12792322 - Vorster, Michael Johannes


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