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Full-Text Articles in Physical Sciences and Mathematics
Production Of Milky-Way Structure By The Magellanic-Clouds, Md Weinberg
Production Of Milky-Way Structure By The Magellanic-Clouds, Md Weinberg
Astronomy Department Faculty Publication Series
Previous attempts at disturbing the galactic disk by the Magellanic Clouds relied on direct tidal forcing. However, by allowing the halo to actively respond rather than remain a rigid contributor to the rotation curve, the Clouds may produce a wake in the halo which then distorts the disk. Recent work reported here suggests that the Magellanic Clouds use this mechanism to produce disk distortions sufficient to allow for both the radial location, position angle and sign of the HI warp and observed anomalies in stellar kinematics toward the galactic anticenter and LSR motion.
Kinematic Signature Of A Rotating Bar Near A Resonance, Md Weinberg
Kinematic Signature Of A Rotating Bar Near A Resonance, Md Weinberg
Astronomy Department Faculty Publication Series
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. …