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• W1965618058 endingPage "2096" @default.
• W1965618058 startingPage "2083" @default.
• W1965618058 abstract "Polarization measurements of the microquasar Cygnus X–1 exist at γ-ray, X-ray, ultraviolet, optical and radio frequencies. The γ-ray emission has been shown to be highly linearly polarized. Here, we present new infrared polarimetric data of Cygnus X–1 taken with the 10.4 m Gran Telescopio Canarias and the 4.2 m William Herschel Telescope. We show that the broad-band, radio-to-γ-ray flux spectrum and polarization spectrum in the hard state are largely consistent with a simple phenomenological model of a strongly polarized synchrotron jet, an unpolarized Comptonized corona and a moderately polarized interstellar dust component. In this model, the origin of the γ-ray, X-ray and some of the infrared polarization is the optically thin synchrotron power law from the inner regions of the jet. The model requires the magnetic field in this region to be highly ordered and perpendicular to the axis of the resolved radio jet. This differs from studies of some other X-ray binaries, in which the magnetic field is turbulent, variable and aligned with the jet axis. The model is able to explain the approximate polarization strength and position angle at all wavelengths including the detected X-ray (3–5 keV) polarization, except the observed position angle of the γ-ray polarization, which differs from the model by ∼60°. Past numerical modelling has shown that a curved synchrotron spectrum can produce a shift in position angle by ∼60°, which may account for this." @default.
• W1965618058 created "2016-06-24" @default.
• W1965618058 creator A5015252379 @default.
• W1965618058 creator A5019970203 @default.
• W1965618058 date "2014-01-09" @default.
• W1965618058 modified "2023-10-18" @default.
• W1965618058 title "The multiwavelength polarization of Cygnus X–1" @default.
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