Magnetic Fields of Galaxies

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Springer Science & Business Media, May 31, 1988 - Science - 313 pages
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Magnetism, when extended beyond normal frameworks into cosmic space is characterized by an enormous spatial scale. Because of their large sizes the nature of magnets such as the Earth and the Sun is entirely different from the nature of a horseshoe magnet. The source of cosmic magnetism is associated with the hydrodynamic motions of a highly conductive medium. In this aspect, cosmic magnets resemble a dynamo. However, currents in the dynamo flow along properly ordered wires, while chaotic, turbulent motions are dominant inside stars and liquid planetary cores. This makes more intriguing and surprising the fact that these motions maintain a regular magnetic field. Maintenance of magnetic fields is even more impressive in huge magnets, i.e. galaxies. In fact, we are living inside a giant dynamo machine, the Milky Way galaxy. Although the idea of the global magnetic field of our Galaxy was clearly proposed almost 40 years ago, firm observational evidence and definite theoretical concepts of galactic magnetism have been developed only in the last decade. This book is the first attempt at a full and consistent presentation of this problem. We discuss both theoretical views on the origin of galactic magnetism and the methods of observational study. Previous discussions were on the level of review articles or separate chapters in monographs devoted to cosmic magnetic fields (see, e.g., H. K. Moffatt, 1978, E. N. Parker, 1979 and Zeldovich et aI., 1983).
  

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Contents

CHAPTER I
1
CHAPTER II
7
112 Spiral Galaxies
11
II3 Gas and Dust
12
II4 Cosmic Rays
17
CHAPTER III
20
III2 Polarization of Synchrotron Emission
24
III3 Faraday Rotation
32
VI4 Mean Hclicity
162
VI5 Magnetic Fields and Star Formation
166
CHAPTER VII
171
VII2 The Mean Magnetic Field
172
VII3 Evolution of Magnetic Field in a Moving Medium
173
VII4 The Equation for the Mean Magnetic Field
177
VII5 Field Distribution Across the Disc
181
VII6 Radial Field Distribution in Discs of Variable Thickness
191

III4 Light Polarization by Dust
37
1115 Zeeman Splitting
47
III6 Other Methods
53
III7 Discussion
54
CHAPTER IV
57
IV2 How the Magnetic Field is Derived from Faraday Rotation Data
64
IV3 The Largescale Magnetic Field of the Galaxy According to Faraday Rotations of Extragalactic Sources
71
IV4 The Fluctuation Magnetic Field in the Galaxy
79
IV5 The Structure of the LargeScale Field
80
IV6 Intensity Variations of the Galactic Nonthermal Radio Background
81
IV7 Magnetic Fields in Nearby Spiral Galaxies
85
CHAPTER V
95
V2 The Relic Field Hypothesis
97
V3 Cosmological Magnetic Fields
103
V4 Stellar Ejections
109
V5 The Dynamo
113
GALACTIC HYDRODYNAMICS
122
VI2 Shape of the Gaseous Disc
133
VI 3 Interstellar Turbulence
142
VII7 Radial Distribution of Axisymmetric Fields in Spiral Galaxies
200
VII8 Generation of NonAxisymmetric Magnetic Fields in an Axisymmetric Disc
209
VII9 The Origin of LargeScale Bisymmetric Magentic Structures
224
VII10 LargeScale Magnetic Fields in Rigidly Rotating Objects
233
VII11 Magnetic Fields Within Spiral Arms
242
VII12 Nonlinear Effects in the Galactic Dynamo
246
VII13 Generation of Fluctuation Fields
248
VII14 Seed Fields
255
CHAPTER VIII
261
VIII2 Magnetic Fields in Clusters of Galaxies
264
CHAPTER IX
269
IX2 Quasars and Active Galactic Nuclei
271
IX3 Radiogalaxies
274
IX4 Jets
278
CHAPTER X
284
REFERENCES
286
INDEX
311
Copyright

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Page 290 - Large-Scale Effects of Supernova Remnants on the Galaxy: Generation and Maintenance of a Hot Network of Tunnels.
Page 310 - A Search for a Linearly Polarized Component of the Galactic Radio Emission at 408 Mc/s', Observatory 82, 158164.
Page 294 - JM (1980) A unified model of interstellar grains - A connection between alignment efficiency, grain model size, and cosmic abundance, Astron. Astrophys. 88, No. 1-2, 194-202. Huck FO, Sinclair AR and Burcher EE (1973) First order optical analysis of a quasimicroscope for planetary landers, NASA, TN D-7129. Jakes
Page 309 - The Distribution of Atomic Hydrogen in the Outer Parts of the Galactic System", Bull.
Page 303 - ... the gas content of galaxies. Astrophys. J. 176:L9-L14, 1972. 39. REEVES, H., J. AUDOUZE, WA FOWLER, and DN SCHRAMM. On the origin of light elements. Astrophys. J. 179:909, 1973. 40. RINGWOOD, AE Origin of the Moon. (Clarke Memorial Lecture) Earth Planet. Sci. Lett. 8: 131-140, 1970. 41. ROBERTS, WW Large-scale shock formation in spiral galaxies and its implications on star formation.
Page 290 - Crawford, MK , Genzel, R. , Harris, AI, Jaffe, DT , Lacy, JH, Lugten, JB, Serabyn, E. and Townes, CH 1985, Nature 315.

References to this book

Stellar Magnetism
Leon Mestel
No preview available - 1999
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