Outer dynamics and escapes in barred galaxies

Details Outer dynamics and escapes in barred galaxies Outer dynamics and escapes in barred galaxies

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.369.1039c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 369, Issue 3, pp. 1039-1054.

Astronomy and Astrophysics

Astronomy

13

Galaxies: Kinematics And Dynamics

Scientific paper

We study the dynamics of the outer parts of barred galaxies (beyond corotation). In this region there are several islands of stability around stable periodic orbits and chaotic orbits that eventually escape from the galaxy. We study the forms of the orbits (periodic and non-periodic) and the intersections of the orbits by a surface of section , i.e. y = 0, for fixed values of the Jacobi constant. The structure of phase space is characterized by the rotation curve, i.e. the rotation number of successive orbits with initial conditions along the x-axis. The non-escaping orbits have initial conditions inside a `last KAM torus'. The escaping orbits either have a positive energy from the beginning, or they change their energy at irregular intervals of time, acquiring finally positive energy that leads to escape. The successive consequents (intersections) of such an orbit are along `bell-type curves' (one curve for each value of the energy). On the surface of section we see also almost rectilinear `rays' that are the images of the x-axis (i.e. ). The lower parts of these rays represent escaping orbits. These escapes are much faster than the escapes produced by encounters of stars among themselves. We considered two models of galactic type and various values of the Jacobi constant. These models have the same basic behaviour as regards the non-escaping and escaping orbits. This is an indication that these phenomena are characteristic of the outer parts of generic rotating galaxies.

Affiliated with

Also associated with

No associations

Rating

Outer dynamics and escapes in barred 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 Outer dynamics and escapes in barred galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Outer dynamics and escapes in barred galaxies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1883909