Resonant scattering in galaxy clusters for anisotropic gas motions on various spatial scales |
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Authors: | I V Zhuravleva E M Churazov S Yu Sazonov R A Sunyaev K Dolag |
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Institution: | 1.Max Planck Institut für Astrophysik,Garching,Germany;2.Space Research Institute,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | The determination of the characteristic amplitudes and directions of hot gas motions in galaxy clusters from observations
of the brightest resonance lines is discussed. Gas motions affect (i) the spectral line shape through the Doppler effect and
(ii) the distortions of the radial surface brightness profiles in lines during resonant scattering. Radiative transfer calculations
have been performed by the Monte Carlo method in the FeXXV resonance line at 6.7 keV for the Perseus cluster A426. As a result,
(a) radial motions have been shown to reduce the scattering efficiency much more dramatically than purely tangential motions;
(b) large-scale gas motions have been shown to affect weakly the scattering efficiency; and (c) the uncertainty in measuring
the characteristics of gas motions using resonant scattering has been estimated from existing and future observations of clusters. |
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