منابع مشابه
Magnetic fields in galaxies
Disk galaxies, of which the Milky Way is a typical example, possess large scale magnetic fields. The interstellar gas in which the fields reside is removed and replaced on a timescale of about 1/10 of the age of the Galaxy, and the new gas must acquire a magnetic field of the correct strength and direction on this timescale in order to maintain a steady state. The outstanding problem facing all...
متن کاملMagnetic Fields in Galaxies
Most of the visible matter in the Universe is ionized, so that cosmic magnetic fields are quite easy to generate and due to the lack of magnetic monopoles hard to destroy. Magnetic fields have been measured in or around practically all celestial objects, either by in-situ measurements of spacecrafts or by the electromagnetic radiation of embedded cosmic rays, gas or dust. The Earth, the Sun, so...
متن کاملMagnetic fields in barred galaxies
We study the generation and maintenance of large-scale magnetic fields in barred galaxies. We take a velocity field (with strong noncircular components) from a published gas dynamical simulation of Athanassoula (1992), and use this as input to a galactic dynamo calculation. Our work is largely motivated by recent high quality VLA radio observations of the barred galaxy NGC 1097, and we compare ...
متن کاملMagnetic Fields in Young Galaxies
We have studied the fate of initial magnetic fields in the hot halo gas out of which the visible parts of galaxies form, using threedimensional numerical MHD-experiments. The halo gas undergoes compression by several orders of magnitude in the subsonic cooling flow that forms the cold disk. The magnetic field is carried along and is amplified considerably in the process, reaching μG levels for ...
متن کاملMagnetic fields and rotation of spiral galaxies
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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ژورنال
عنوان ژورنال: Nature
سال: 1993
ISSN: 0028-0836,1476-4687
DOI: 10.1038/365020a0