Kinematic Signature of a Rotating Bar Near a Resonance

Details Kinematic Signature of a Rotating Bar Near a Resonance Kinematic Signature of a Rotating Bar Near a Resonance

1993-04-28

arxiv.org/abs/astro-ph/9304026v1

Astronomy and Astrophysics

Astrophysics

24 pages, AAS LaTeX macros v3.0, 23 figures (available on request)

Scientific paper

10.1086/173589

There have been several recent suggestions that the Milky Way has rotating bar-like features based on HI and star count data. In this paper, I show that such features cause distinctive stellar kinematic signatures near OLR and ILR. The effects of these resonances may be observable far from the peak density of the pattern and relatively nearby the solar position. The details of the kinematic signatures depend on the evolutionary history of the `bar' and therefore velocity data, both systemic and velocity dispersion, may be used to probe the evolutionary history as well as the present state of the Galaxy. Kinematic models for a variety of simple scenarios are presented. Models with evolving pattern speeds show significantly stronger dispersion signatures than those with static pattern speeds, suggesting that useful observational constraints are possible. The models are applied to the proposed rotating spheroid and bar models; we find: 1) none of these models chosen to represent the proposed large-scale rotating spheroid are consistent with the stellar kinematics; and 2) a Galactic bar with semimajor axis of $3\kpc$ will cause a large increase in velocity dispersion in the vicinity of OLR ($\sim5\kpc$) with little change in the net radial motion and such a signature is suggested by K-giant velocity data. Potential future observations and analyses are discussed.

Affiliated with

Also associated with

No associations

Rating

Kinematic Signature of a Rotating Bar Near a Resonance 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 Kinematic Signature of a Rotating Bar Near a Resonance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Kinematic Signature of a Rotating Bar Near a Resonance will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-351184