Magnetic Fields and the Interstellar Medium in Spiral Arms
نویسندگان
چکیده
منابع مشابه
Galactic magnetic fields and spiral arms 3D dynamo simulations
We investigate the evolution of three-dimensional (3D), large-scale galactic magnetic fields under the influence of time dependent gas flows in spiral arms and excited by a turbulent dynamo. Our principal goal is to check how the enhanced turbulent diffusion in spiral arms affects the global magnetic field structure evolving under the influence of the dynamically changing gaseous spiral arms. S...
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Context. The spiral galaxy NGC 6946 hosts magnetic spiral arms, highly aligned magnetic fields between the gas/optical arms. Aims. The origin of the magnetic phenomena and their relation to the interstellar gas are investigated. Methods. NGC 6946 was observed in total intensity and linear polarization in five radio bands between 3 cm and 21 cm. Maps of spectral index, Faraday rotation and depol...
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We present a simplified model in which we suggest that two important galactic problems -the magnetic field configuration at large scales and the flat rotation curvemay be simultaneously explained. A highly convective disc produces a high turbulent magnetic diffusion in the vertical direction, stablishing a merging of extragalactic and galactic magnetic fields. The outer disc may then adquire a ...
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The first hints that our galaxy, the Milky Way, might host a large-scale magnetic field came in the late 1940s, from studies of the polarization of starlight. However, optical polarization is a relatively blunt tool and it was only in the late 1950s that radio synchroton observations began to indicate the presence of large-scale fields (e.g. Gardner and Davies 1966). By the early 1980s observat...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1996
ISSN: 0074-1809
DOI: 10.1017/s0074180900233743