A bar in the inner halo of barred galaxies I. Structure and kinematics of a representative model

Details A bar in the inner halo of barred galaxies I. Structure and kinematics of a representative model A bar in the inner halo of barred galaxies I. Structure and kinematics of a representative model

2007-03-08

arxiv.org/abs/astro-ph/0703184v1

Mon.Not.Roy.Astron.Soc.377:1569-1578,2007

Astronomy and Astrophysics

Astrophysics

10 pages, 11 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2007.11711.x

N-body simulations argue that the inner haloes of barred galaxies should not be spherical, nor even axisymmetric, but triaxial. The departure from sphericity is strongest near the centre and decreases outwards; typical axial ratios for the innermost parts are of the order of 0.8. The halo shape is prolate-like in the inner parts up to a certain radius and then turns to oblate-like. I call this inner halo structure the `halo bar' and analyse here in depth its structure and kinematics in a representative model. It is always considerably shorter than the disc bar. It lags the disc bar by only a few degrees at all radii and the difference between the two bar phases increases with distance from the centre. The two bars turn with roughly the same pattern speed. This means that the halo bar is a slow bar, since its corotation radius is much larger than its length. The bisymmetric component in the halo continues well outside the halo bar in the form of an open spiral, trailing behind the disc bar. The inner parts of the halo display some mean rotation in the same sense as the disc rotation. This is more important for particles nearer to the equatorial plane and decreases with increasing distance from it, but is always much smaller than the disc rotation.

Affiliated with

Also associated with

No associations

Rating

A bar in the inner halo of barred galaxies I. Structure and kinematics of a representative model 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 A bar in the inner halo of barred galaxies I. Structure and kinematics of a representative model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A bar in the inner halo of barred galaxies I. Structure and kinematics of a representative model will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-642345