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Discovery of very high energy gamma rays associated with an x-ray binary |
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| Authors: | Aharonian F Akhperjanian A G Aye K-M Bazer-Bachi A R Beilicke M Benbow W Berge D Berghaus P Bernlöhr K Boisson C Bolz O Borrel V Braun I Breitling F Brown A M Bussons Gordo J Chadwick P M Chounet L-M Cornils R Costamante L Degrange B Dickinson H J Djannati-Ataï A Drury L O'c Dubus G Emmanoulopoulos D Espigat P Feinstein F Fleury P Fontaine G Fuchs Y Funk S Gallant Y A Giebels B Gillessen S Glicenstein J F Goret P Hadjichristidis C Hauser M Heinzelmann G Henri G Hermann G Hinton J A Hofmann W Holleran M Horns D Jacholkowska A de Jager O C Khélifi B Komin Nu Konopelko A Latham I J Le Gallou R |
| Institution: | Max-Planck-Institut für Kernphysik, Post Office Box 103980, D-69029 Heidelberg, Germany. |
| Abstract: | X-ray binaries are composed of a normal star in orbit around a neutron star or stellar-mass black hole. Radio and x-ray observations have led to the presumption that some x-ray binaries called microquasars behave as scaled-down active galactic nuclei. Microquasars have resolved radio emission that is thought to arise from a relativistic outflow akin to active galactic nuclei jets, in which particles can be accelerated to large energies. Very high energy gamma-rays produced by the interactions of these particles have been observed from several active galactic nuclei. Using the High Energy Stereoscopic System, we find evidence for gamma-ray emission of >100 gigaelectron volts from a candidate microquasar, LS 5039, showing that particles are also accelerated to very high energies in these systems. |
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