Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/76844
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dc.contributor.author | Maxted, N. | - |
dc.contributor.author | Nicholas, B. | - |
dc.contributor.author | Rowell, G. | - |
dc.date.issued | 2012 | - |
dc.identifier.citation | Astronomy and Astrophysics: a European journal, 2012; 545:L2-1-L2-5 | - |
dc.identifier.issn | 0004-6361 | - |
dc.identifier.issn | 1432-0746 | - |
dc.identifier.uri | http://hdl.handle.net/2440/76844 | - |
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 ± 0.2(sub)stat ± 0.3(sub)syst and a normalisation at 1 TeV of (8.2 ± 0.8(sub)stat ± 2.5(sub)syst) × 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. | - |
dc.description.statementofresponsibility | H.E.S.S. Collaboration, A. Abramowski ... N. Maxted ... B. Nicholas ... G. Rowell ... et al. | - |
dc.language.iso | en | - |
dc.publisher | EDP Sciences | - |
dc.rights | © ESO 2012 | - |
dc.source.uri | http://dx.doi.org/10.1051/0004-6361/201219906 | - |
dc.subject | gamma rays: general | - |
dc.subject | pulsars: individual: PSR J0537-6910 | - |
dc.subject | ISM: supernova remnants | - |
dc.subject | Magellanic Clouds | - |
dc.title | Discovery of gamma-ray emission from the extragalactic pulsar wind nebula N 157B with HESS | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1051/0004-6361/201219906 | - |
dc.relation.grant | CNRS-IN2P3 | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Rowell, G. [0000-0002-9516-1581] | - |
Appears in Collections: | Aurora harvest Chemistry and Physics publications |
Files in This Item:
File | Description | Size | Format | |
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hdl_76844.pdf | Published version | 1.21 MB | Adobe PDF | View/Open |
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