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The S(c) spectrum machine to visualize the motion in galaxies
Author(s) -
Caranicolas N.D.,
Papadopoulos N.J.
Publication year - 2007
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.200610749
Subject(s) - physics , chaotic , galaxy , motion (physics) , spectrum (functional analysis) , bar (unit) , angular velocity , harmonic , core (optical fiber) , classical mechanics , orbit (dynamics) , astrophysics , quantum mechanics , optics , computer science , artificial intelligence , meteorology , engineering , aerospace engineering
The behavior of the orbits in a galaxy model composed of an harmonic core and a strong bar potential is studied. Numerical calculations show that a large number of orbits display chaotic motion. These orbits are low angular momentun orbits. The percentage of chaotic orbits increases as the angular velocity of the system increases or the strength of the harmonic term decreases. A new dynamical parameter, the S(c) spectrum, is introduced and used to detect the island motion and the evolution of the sticky regions. Comparison to previously obtained results reveals the leading role of the new spectrum. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)