On the Lynden-Bell Bar Formation Mechanism in Galactic Disks

2020 ◽  
Vol 46 (1) ◽  
pp. 12-23
Author(s):  
E. V. Polyachenko ◽  
I. G. Shukhman
Keyword(s):  
Formation Mechanism ◽  
Galactic Disks ◽  
Bar Formation

scholarly journals The Lynden-Bell bar formation mechanism in simple and realistic galactic models

2020 ◽  
Vol 498 (3) ◽  
pp. 3368-3373
Author(s):  
E V Polyachenko ◽  
I G Shukhman
Keyword(s):  
Perturbation Theory ◽  
Angular Momentum ◽  
Formation Mechanism ◽  
Linear Perturbation ◽  
Matrix Approach ◽  
Precession Rate ◽  
Secular Evolution ◽  
The Matrix ◽  
Linear Perturbation Theory ◽  
Bar Formation

ABSTRACT Using the canonical Hamilton–Jacobi approach we study the Lynden-Bell concept of bar formation based on the idea of orbital trapping parallel to the long or short axes of the oval potential distortion. The concept considered a single parameter – a sign of the derivative of the precession rate over angular momentum, determining the orientation of the trapped orbits. We derived a perturbation Hamiltonian that includes two more parameters characterizing the background disc and the perturbation, which are just as important as the earlier known one. This allows us to link the concept with the matrix approach in linear perturbation theory, the theory of weak bars, and explain some features of the non-linear secular evolution observed in N-body simulations.

scholarly journals On the bar formation mechanism in galaxies with cuspy bulges

2016 ◽  
Vol 462 (4) ◽  
pp. 3727-3738 ◽  
Author(s):  
E. V. Polyachenko ◽  
P. Berczik ◽  
A. Just
Keyword(s):  
Formation Mechanism ◽  
Bar Formation

[CII] synthetic emission maps of simulated galactic disks

2015 ◽  
Vol 75-76 ◽  
pp. 385-386
Author(s):  
A. Franeck ◽  
S. Walch ◽  
S.C.O. Glover ◽  
D. Seifried ◽  
P. Girichidis ◽  
...  
Keyword(s):  
Galactic Disks
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