Saha, Kanak (2008) Low-frequency m = 1 normal mode oscillations of a self-gravitating disc. In: Monthly Notices of the Royal Astronomical Society: Letters, 386 (1). L101-L105.
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A continuous system such as a galactic disc is shown to be well approximated by an N-ring differentially rotating self-gravitating system. Lowest order (m = 1) non-axisymmetric features such as lopsidedness and warps are global in nature and quite common in the discs of spiral galaxies. Apparently, these two features of the galactic discs have been treated like two completely disjoint phenomena. The present analysis based on an eigenvalue approach brings out clearly that these two features are fundamentally similar in nature and they are shown to be very low-frequency normal mode (LNM) oscillations manifested in different symmetry planes of the galactic disc. Our analysis also shows that these features are actually long-lived oscillating pattern of the N-ring self-gravitating system.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Blackwell Publishing, Inc.|
|Keywords:||galaxies: kinematics and dynamics;galaxies: spiral;galaxies: structure|
|Department/Centre:||Division of Physical & Mathematical Sciences > Physics|
|Date Deposited:||14 May 2008|
|Last Modified:||19 Sep 2010 04:44|
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