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Does a Rotation Velocity Jump Generate the Outer Spiral Structure?

Published online by Cambridge University Press:  25 May 2016

A.M. Fridman ,
O.V. Khoruzhii  and
V.V. Lyakhovich
A.M. Fridman
Affiliation:
Institute of Astronomy, Russian Academy of Sciences, 48 Pyatnitskaya St., Moscow, 109017, Russia
O.V. Khoruzhii
Affiliation:
Institute of Astronomy, Russian Academy of Sciences, 48 Pyatnitskaya St., Moscow, 109017, Russia
V.V. Lyakhovich
Affiliation:
Institute of Astronomy, Russian Academy of Sciences, 48 Pyatnitskaya St., Moscow, 109017, Russia

Extract

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We investigate a stability of the gaseous disk in the Milky Way. The rotation curve with smooth two kinks in the Solar vicinity (Fig.1) was adopted in accordance with the observations (Fridman et al., 1994a). Such a gaseous disk is unstable. The instability can generate the four-armed spiral (Fig.2) and four-vortex structure (Fig.3). The method of the analysis is described by Fridman et al., 1994b. The generation mechanism is similar to that described by Glatsel, 1987.

Type
Chapter 6: How are we to Understand the Large Scale Structure of the ISM?
Information
Symposium - International Astronomical Union , Volume 169: Unsolved Problems of the Milky Way , 1996 , pp. 505 - 506
Copyright
Copyright © Kluwer 1996 

References

Blitz, L. (1983) In “Surveys of the Southern Galaxy”, eds. Burton, W.B. and Israel, F.P., Dordrecht, 117.Google Scholar
Fridman, A.M., Khoruzhii, O.V., Lyakhovich, V.V., Avedisova, V.S. (1994a) in this volume.Google Scholar
Fridman, A.M., Khoruzhii, O.V., Lyakhovich, V.V. (1994b) In “Physics of the Gaseous and Stellar Disks of the Galaxy”, ed. King, I.R., Astron. Soc. of the Pacific, 66, 285.Google Scholar
Glatzel, W. (1987) Mon. Not. R. Astr. Soc., 228, 77.CrossRefGoogle Scholar