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On the Hydrodynamical Conception of the Spiral Structure in Galaxies with a Velocity “Kink” on the Rotation Curve (Theory, Laboratory Experiments, Numerical Simulation, Observations)

Published online by Cambridge University Press:  04 August 2017

A.M. Fridman ,
A.G. Morozov ,
M.V. Nezlin ,
I.I. Pasha ,
V.L. Polyachenko ,
A. Yu. Rylov ,
E.N. Snezhkin ,
Yu. N. Rorgashin  and
A.S. Trubnikov
A.M. Fridman
Affiliation:
Astronomical Council of the USSR Academy of Sciences Pyatnitskaya St. 48, 109017 Moscow, USSR
A.G. Morozov
Affiliation:
Volgograd State University, Prodol'naua St. 20, 400062 Volgograd, USSR
M.V. Nezlin
Affiliation:
Kurchatov Atomic Energy Institute, Kurchatova Squ. 46, 123182 Moscow, USSR
I.I. Pasha
Affiliation:
Astronomical Council of the USSR Academy of Sciences Pyatnitskaya St. 48, 109017 Moscow, USSR
V.L. Polyachenko
Affiliation:
Astronomical Council of the USSR Academy of Sciences Pyatnitskaya St. 48, 109017 Moscow, USSR
A. Yu. Rylov
Affiliation:
Kurchatov Atomic Energy Institute, Kurchatova Squ. 46, 123182 Moscow, USSR
E.N. Snezhkin
Affiliation:
Kurchatov Atomic Energy Institute, Kurchatova Squ. 46, 123182 Moscow, USSR
Yu. N. Rorgashin
Affiliation:
Volgograd State University, Prodol'naua St. 20, 400062 Volgograd, USSR
A.S. Trubnikov
Affiliation:
Kurchatov Atomic Energy Institute, Kurchatova Squ. 46, 123182 Moscow, USSR

Abstract

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The hydrodynamical conception of the spiral structure generation in the galaxies with a “kink” on the rotation curve is discussed. It treats the spirals as density waves in gas component of galactic disks. The main results of the fifteen-year study are presented. References are made to the papers of authors that prove a) the “gas” conception of the Galaxy spiral structure, b) the identity of equations for rotating shallow water and galactic gas disk, c) the method of laboratory modelling of galactic spirals induced by hydrodynamical mechanisms in shallow water experiments with the “Spiral” set up. The linear stability theory describes the mechanism of spiral arm formation and gives the parameters of the arms. Experiments agree with theory. Besides, they show banana-like vortices between the arms near the generator. Observational data on the galaxy NGC 1566 reveal a pronounced velocity kink and may be explained in terms of the spiral-vortex gas conception. The results of laboratory experiments and numerical simulations allow us to suggest certain hypothesis concerning observational evidences of the spiral-vortex structure.

Type
III. Seyfert Galaxies
Information
Symposium - International Astronomical Union , Volume 121: Observational Evidences of Activity of Galaxies , 1987 , pp. 147 - 157
Copyright
Copyright © Reidel 1987 

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