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2011-12-10

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/122845

Thermal X-Ray emission from the shocked stellar wind of pulsar gamma-ray binaries

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Recurs relacionat

https://doi.org/10.1088/0004-637X/743/1/7

Resum

Gamma-ray loud X-ray binaries are binary systems that show non-thermal broadband emission from radio to gamma rays. If the system comprises a massive star and a young non-accreting pulsar, their winds will collide producing broadband non-thermal emission, most likely originated in the shocked pulsar wind. Thermal X-ray emission is expected from the shocked stellar wind, but until now it has neither been detected nor studied in the context of gamma-ray binaries. We present a semi-analytic model of the thermal X-ray emission from the shocked stellar wind in pulsar gamma-ray binaries, and find that the thermal X-ray emission increases monotonically with the pulsar spin-down luminosity, reaching luminosities of the order of 10^33 erg/s. The lack of thermal features in the X-ray spectrum of gamma-ray binaries can then be used to constrain the properties of the pulsar and stellar winds. By fitting the observed X-ray spectra of gamma-ray binaries with a source model composed of an absorbed non-thermal power law and the computed thermal X-ray emission, we are able to derive upper limits on the spin-down luminosity of the putative pulsar. We applied this method to LS 5039, the only gamma-ray binary with a radial, powerful wind, and obtain an upper limit on the pulsar spin-down luminosity of ~6x10^36 erg/s. Given the energetic constraints from its high-energy gamma-ray emission, a non-thermal to spin-down luminosity ratio very close to unity may be required.

Matèries

Estels binaris de raigs X, Raigs gamma

Matèries (anglès)

X-ray binaries, Gamma rays

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Articles publicats en revistes (Física Quàntica i Astrofísica)
Publicacions de projectes de recerca finançats per la UE

Citació

ZABALZA DE TORRES, Víctor, BOSCH I RAMON, Valentí and PAREDES I POY, Josep Maria. Thermal X-Ray emission from the shocked stellar wind of pulsar gamma-ray binaries. Astrophysical Journal. 2011. Vol. 743, num. 7. ISSN 0004-637X. [consulted: 18 of August of 2026]. Available at: https://hdl.handle.net/2445/122845

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