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The Formation of Spiral Arms and Rings in Barred Galaxies [PDF]
Astronomy and Astrophysics, 2007 9 pages, 4 figures, conference proceedings of "Chaos, complexity and transport: Theory and Applications", Marseille, June 2007We propose a new theory to explain the formation of spiral arms and of all types of outer rings in barred galaxies.
Lia Athanassoula +2 more
exaly +7 more sources
Symposium - International Astronomical Union, 1970 We point out some properties of barred spiral galaxies which are important for the theory of their formation and spiral structure, and describe some theoretical work on the dynamics of these systems.
K C Freeman
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Invariant Manifolds and the Response of Spiral Arms in Barred Galaxies
Astronomy and Astrophysics, 2009 The unstable invariant manifolds of the short-period family of periodic orbits around the unstable Lagrangian points L1 and L2 of a barred galaxy define loci in the configuration space, which take the form of a trailing spiral pattern.
Christos Efthymiopoulos +1 more
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The Secrets of Barred Spiral Galaxies
Global Research Journal, 2022Black holes start their lives as big dead stars in the depth of the universe. As they move towards the outer universe they gather cosmic dust, asteroids, planets, eventually they get bigger. The gravitational force increases and continues this process for billions of years. When an asteroid enters the gravitational field of an ever-growing dead star, it
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Physics Letters A, 2000
Abstract Here we put forward some arguments in favour of the existence of slow bars. More then a half of spiral galaxies have in their central regions a bar — a structure in the form of triaxial ellipsoid. Historically two models of the bar were developed — those of the so called “slow” and “fast” bars. In both cases the bar is in some resonance with
A.M. Fridman, O.V. Khoruzhii
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Abstract Here we put forward some arguments in favour of the existence of slow bars. More then a half of spiral galaxies have in their central regions a bar — a structure in the form of triaxial ellipsoid. Historically two models of the bar were developed — those of the so called “slow” and “fast” bars. In both cases the bar is in some resonance with
A.M. Fridman, O.V. Khoruzhii
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The barred spiral structure of galaxies
Chinese Astronomy and Astrophysics, 1984Abstract We have carried out a preliminary analysis of barred spirals using a gas-dynamical model. By means of the method of integral transform given in a previous paper [1], an analytical solution has been obtained which is in fair agreement with observations.
null Chen Zhen-cheng +2 more
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Stellar Diffusion in Barred Spiral Galaxies [PDF]
Astronomy and Astrophysics, 2011 11 pages, 9 figures, accepted for publication in Astron ...
Maura Brunetti +2 more
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DIFFUSION OF CHAOTIC ORBITS IN BARRED SPIRAL GALAXIES
International Journal of Bifurcation and Chaos, 2011We study the diffusion of chaotic orbits in an N-body model simulating a barred spiral galaxy. Chaotic orbits with initial conditions outside corotation support the spiral structure of the galaxy due to the phenomenon of stickiness close and along the unstable asymptotic manifolds of the unstable periodic orbits.
M. Harsoula +2 more
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STRUCTURES OUT OF CHAOS IN BARRED-SPIRAL GALAXIES
International Journal of Bifurcation and Chaos, 2012We review the dynamical mechanisms we have found to support the morphological features in barred-spiral galaxies based on chaotic motions of stars in their gravitational fields. These morphological features are the spiral arms, that emerge out of the ends of the bar, but also shape the bar itself.
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