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HESS J0632+057: hydrodynamics and non-thermal emission
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HESS J0632+057 is an eccentric gamma-ray Be binary that produces non-thermal radio, Xrays, GeV and very high-energy gamma-rays. The non-thermal emission of HESS J0632+057 is modulated with the orbital period, with a dominant maximum before apastron passage. The nature of the compact object in HESS J0632+057 is not known, although it has been proposed to be a young pulsar as in PSR B1259-63, the only gamma-ray emitting high-mass binary known to host a non-accreting pulsar. In this letter, we present hydrodynamical simulations of HESS J0632+057 in the context of a pulsar and a stellar wind interacting in an eccentric binary, and propose a scenario for the non-thermal phenomenology of the source. In this scenario, the non-thermal activity before and around apastron is linked to the accumulation of non-thermal particles in the vicinity of the binary, and the sudden drop of the emission before apastron is produced by the disruption of the two-wind interaction structure, allowing these particles to escape efficiently. In addition to providing a framework to explain the nonthermal phenomenology of the source, this scenario predicts extended, moving X-ray emitting structures similar to those observed in PSR B1259-63
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BOSCH I RAMON, Valentí, BARKOV, M. v., MIGNONE, Andrea, BORDAS COMA, Pol. HESS J0632+057: hydrodynamics and non-thermal emission. _Monthly Notices of the Royal Astronomical Society_. 2017. Vol. 471, núm. 1, pàgs. L150-L154. [consulta: 10 de abril de 2026]. ISSN: 0035-8711. [Disponible a: https://hdl.handle.net/2445/164720]