Characterizing High Mass X-Ray Binary Environments: MOST and Spitzer Space Telescope Observations

Sarty, Gordon E.; Matthews, J. M.; Szalai, T.; Balog, Z.; Kiss, L. L.; Wu, Kinwah; Mebarki, N.; Mimouni, J.

doi:10.1063/1.3518346

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“…The stellar mass-loss rate has been taken to be ∼ 3 × 10 −7 M ⊙ /yr. The ephemeris, orbital parameters, system-observer geometry, star and stellar wind properties, and inclination angle constraints have been taken from Casares et al 2005 andAragona et al 2009 (see also Sarty et al 2010). The system orientation in the plane of the sky, unconstrained from observations, has been taken as in Fig.…”

Section: Application To Ls 5039mentioning

confidence: 99%

Monte-Carlo Simulations of Radio Emitting Secondaries in Gamma-Ray Binaries

Bosch-Ramon,

Khangulyan

2011

Preprint

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Several binary systems that contain a massive star have been detected in both the radio band and at very high energies. In the dense stellar photon field of these sources, gamma-ray absorption and pair creation are expected to occur, and the radiation from these pairs may contribute significantly to the observed radio emission. We aim at going deeper in the study of the properties, and in particular the morphology, of the pair radio emission in gamma-ray binaries. We apply a Monte-Carlo code that computes the creation location, the spatial trajectory and the energy evolution of the pairs produced in the binary system and its surroundings. The radio emission produced by these pairs, with its spectral, variability and spatial characteristics, is calculated as it would be seen from a certain direction. A generic case is studied first, and then the specific case of LS 5039 is also considered. We find that, confirming previous results, the secondary radio emission should appear as an extended radio structure of a few milliarcseconds size. This radiation would be relatively hard, with fluxes up to ∼ 10 mJy. Modulation is expected depending on the gamma-ray production luminosity, system eccentricity, and wind ionization fraction, and to a lesser extent on the magnetic field structure. In gamma-ray binaries in general, the pairs created due to photon-photon interactions can contribute significantly to the core, and generate an extended structure. In the case of LS 5039, the secondary radio emission is likely to be a significant fraction of the detected core flux, with a marginal extension.

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Section: Application To Ls 5039mentioning

confidence: 99%