Author: Zhuravleva I. V. Churazov E. M. Sazonov S. Yu. Sunyaev R. A. Forman W. Dolag K.
Publisher: Oxford University Press
ISSN: 0035-8711
Source: Monthly Notices of the Royal Astronomical Society, Vol.403, Iss.1, 2010-03, pp. : 129-150
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Abstract
ABSTRACTWe study the impact of gas motions on the polarization of bright X-ray emission lines from the hot intercluster medium. The polarization naturally arises from resonant scattering of emission lines owing to a quadrupole component in the radiation field produced by a centrally peaked gas density distribution. If differential gas motions are present, then a photon emitted in one region of the cluster will be scattered in another region only if their relative velocities are small enough and the Doppler shift of the photon energy does not exceed the linewidth. This affects both the degree and the direction of polarization. The changes in the polarization signal are in particular sensitive to the gas motions
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