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Dynamics of the Galactic Bulge from gas motions

Published online by Cambridge University Press:  07 August 2017

Ortwin E. Gerhard  and
James Binney
Ortwin E. Gerhard
Affiliation:
Landessternwarte, Königstuhl, D-6900 Heidelberg, Germany
James Binney
Affiliation:
Theoretical Physics, Keble Road, Oxford OX1 3NP, U.K.

Abstract

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Observations of cold gas in the inner galactic disk show a clumpy, highly asymmetric distribution, with large non-circular velocities. Recent work has shown that the flow of gas in the inner few kpc is dominated by a rapidly rotating bar, with corotation at R ≃ 2.4 kpc and oriented at an angle of θincl = 16 ± 2° with the line-of-sight to the Galactic Center. From the kinematical model the gravitational potential in the inner Galaxy can be determined. Gas falls inwards through the bar's inner Lindblad resonance at a rate of ∼ 0.1M⊙/ yr; this suggests that in episodic star formation significant mass and angular momentum may be added to the inner bulge.

Type
Contributed Papers
Information
Symposium - International Astronomical Union , Volume 153: Galactic Bulges , 1993 , pp. 275 - 282
Copyright
Copyright © Kluwer 1993 

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