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Structures on the RM sky: the application of wavelet analysisстатья
- Авторы: Stepanov R.A., Frick P., Shukurov A., Sokoloff D.
- Сборник: IAU Joint Discussion
- Серия: IAU Joint Discussion
- Том: 14
- Год издания: 2000
- Аннотация: Coherent structures in the distribution of the Faraday rotation measure of extragalactic radio sources are isolated using wavelet transformation techniques. A new algorithm of wavelet analysis for data points nonuniformly distributed on a sphere is developed and implemented. Imprints of the magnetic fields in the local (Orion) spiral arm, the Sagittarius arm, the radio Loop I and, possibly, the Perseus arm have been revealed using 663 sources from the RM catalogue of Simard-Normandin et al. (1981) and Broten et al. (1985, 1996). Unlike earlier analyses of the RM sky, our approach has allowed us to assess the stability of the results with respect to modifications of the data sample. We find firm evidence of a dominant even symmetry of the local global magnetic field with respect to the galactic equator. Independent estimates of the field strength in the Orion arm using high-latitude sources converge to 1.4±0.3 mkG. Rotation measures of low-latitude sources provide a clear indication of a magnetic field reversal at a distance 0.6-1 kpc towards the Galactic centre. Low-latitude sources from the catalogue of Broten et al. indicate a magneto-ionic structure in the direction of the Perseus arm with the magnetic field direction reversed with respect to that in the Orion arm.
- Добавил в систему: Соколов Дмитрий Дмитриевич