dc.contributor.author | Abramowski, A. | |
dc.contributor.author | Casanova, S. | |
dc.contributor.author | De Jager, O.C. | |
dc.contributor.author | Pekeur, N.W. | |
dc.contributor.author | Sheidaei, F. | |
dc.contributor.author | Venter, C. | |
dc.contributor.author | Vorster, M. | |
dc.contributor.author | H.E.S.S. Collaboration | |
dc.date.accessioned | 2013-11-07T06:40:01Z | |
dc.date.available | 2013-11-07T06:40:01Z | |
dc.date.issued | 2012 | |
dc.identifier.citation | Abramowski, 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.issn | 0004-6361 | |
dc.identifier.issn | 1432-0746 (Online) | |
dc.identifier.uri | http://hdl.handle.net/10394/9459 | |
dc.identifier.uri | https://doi.org/10.1051/0004-6361/201219906 | |
dc.identifier.uri | https://www.aanda.org/articles/aa/abs/2012/09/aa19906-12/aa19906-12.html | |
dc.description.abstract | We 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.iso | en | en_US |
dc.publisher | EDP Sciences | |
dc.subject | Gamma rays: general | en_US |
dc.subject | pulsars: individual: PSR J0537 | en_US |
dc.subject | 6910 | en_US |
dc.subject | ISM: supernova remnants | en_US |
dc.subject | magellanic clouds | en_US |
dc.title | Discovery of gamma-ray emission from the extragalactic pulsar wind nebula N 157B with H.E.S.S | en_US |
dc.type | Article | en_US |
dc.contributor.researchID | 12006653 - Venter, Christo | |
dc.contributor.researchID | 22050574 - Pekeur, Nicolette Whilna | |
dc.contributor.researchID | 23909196 - Casanova, Sabrina | |
dc.contributor.researchID | 10065857 - De Jager, Ocker Cornelis | |
dc.contributor.researchID | 22164405 - Sheidaei, Farzaneh | |
dc.contributor.researchID | 12792322 - Vorster, Michael Johannes | |