Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-02-05
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
8 pages, 7 figures. To appear in "Tumbling, twisting, and winding galaxies: Pattern speeds along the Hubble sequence", E. M. C
Scientific paper
The pattern speeds of spiral galaxies are closely related to the flow of material in their disks. Flows that follow the `precessing ellipses' paradigm (see e.g., Kalnajs 1973) are likely associated with slowly rotating spirals, which have corotation beyond their end. Such a flow can be secured by material trapped around stable, elliptical, x_1 periodic orbits precessing as their Jacobi constant varies. Contrarily, if part of the spiral arms is located at a corotation region then the spiral structure has to `survive' in chaotic regions. Barred-spiral systems with a single pattern speed and a bar ending before, but close to, corotation are candidates for having spirals supported by stars in chaotic motion. In this work we review the flows we have found in response models for various types of spiral potentials and indicate the cases, where order or chaos shapes the observed morphologies.
Kalapotharakos Constantinos
Patsis Panos A.
No associations
LandOfFree
Ordered and chaotic spirals in disk galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Ordered and chaotic spirals in disk galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ordered and chaotic spirals in disk galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-536018