Results 231 to 240 of about 144,718 (240)
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Proceedings of the International Astronomical Union, 2019
AbstractThe venerable problem of what causes the spiral features in disk galaxies is nearing a solution. In previous work, we have shown that transient spirals in simulations result from the superposition of a few coherent waves that have many properties of modes.
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AbstractThe venerable problem of what causes the spiral features in disk galaxies is nearing a solution. In previous work, we have shown that transient spirals in simulations result from the superposition of a few coherent waves that have many properties of modes.
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Frontiers of Applied Mathematics, 2007
The dynamics of spiral galaxies is a gold-mine of challenging problems for the astrophysicist and the applied mathematician. In Astrophysics, we may ask how these island-universes formed, evolved, and reached their current structure and thus address the problems of the dynamics of the interstellar medium, of star formation, of stellar dynamics, and of ...
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The dynamics of spiral galaxies is a gold-mine of challenging problems for the astrophysicist and the applied mathematician. In Astrophysics, we may ask how these island-universes formed, evolved, and reached their current structure and thus address the problems of the dynamics of the interstellar medium, of star formation, of stellar dynamics, and of ...
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Nature, 1988
The concept of the turbulent dynamo in interstellar gas combined with the discovery of global magnetic structures in spiral galaxies has led to a consistent picture of galactic magnetism. Large-scale magnetic fields are generated and maintained by helical turbulent motions of interstellar gas and by differential galactic rotation.
Anvar Shukurov +2 more
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The concept of the turbulent dynamo in interstellar gas combined with the discovery of global magnetic structures in spiral galaxies has led to a consistent picture of galactic magnetism. Large-scale magnetic fields are generated and maintained by helical turbulent motions of interstellar gas and by differential galactic rotation.
Anvar Shukurov +2 more
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2021
Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2021, Tutora: Maria Teresa Antoja ...
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Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2021, Tutora: Maria Teresa Antoja ...
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Publications of the Astronomical Society of the Pacific, 1993
The global properties of galaxies such as their observed luminosities may be severely affected by internal obscuration of the stars by dust. In this thesis I examine the amount and extent of this obscuration using the following approaches: For a sample of eight galaxies for which I have obtained multi-waveband optical and near-infrared observations I ...
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The global properties of galaxies such as their observed luminosities may be severely affected by internal obscuration of the stars by dust. In this thesis I examine the amount and extent of this obscuration using the following approaches: For a sample of eight galaxies for which I have obtained multi-waveband optical and near-infrared observations I ...
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Vistas in Astronomy, 1986
Abstract This article aims to give an overview of the present state of knowledge about the disks of spiral galaxies obtained from a very large number of observations at various wavelengths. Theoretical ideas which are essential for an understanding of much of the observational material are sketched in sections 2 and 3.
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Abstract This article aims to give an overview of the present state of knowledge about the disks of spiral galaxies obtained from a very large number of observations at various wavelengths. Theoretical ideas which are essential for an understanding of much of the observational material are sketched in sections 2 and 3.
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Phenomenology of Spiral Galaxies
1975Galaxies have probably been formed from fluctuations in density and motion in the universe. Many cosmologists have suggested that the separation into individual units took place around the time of decoupling of matter and radiation, when the radius of the universe was about 1/1000th of the present radius.
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Nature, 1976