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• W3100906713 endingPage "122" @default.
• W3100906713 startingPage "122" @default.
• W3100906713 abstract "We report the results of a parameter study of the feathering stability in the galactic spiral arms. A two-dimensional, razor-thin magnetized self-gravitating gas disk with an imposed two-armed stellar spiral structure is considered. Using the formulation developed previously by Lee & Shu, a linear stability analysis of the spiral shock is performed in a localized Cartesian geometry. Results of the parameter study of the base state with a spiral shock are also presented. The single-mode feathering instability that leads to growing perturbations may explain the feathering phenomenon found in nearby spiral galaxies. The self-gravity of the gas, characterized by its average surface density, is an important parameter that (1) shifts the spiral shock farther downstream and (2) increases the growth rate and decreases the characteristic spacing of the feathering structure due to the instability. On the other hand, while the magnetic field suppresses the velocity fluctuation associated with the feathers, it does not strongly affect their growth rate. Using a set of typical parameters of the grand-design spiral galaxy M51 at 2 kpc from the center, the spacing of the feathers with the maximum growth rate is found to be 530 pc, which agrees with the previous observational studies." @default.
• W3100906713 created "2020-11-23" @default.
• W3100906713 creator A5060171077 @default.
• W3100906713 date "2014-08-22" @default.
• W3100906713 modified "2023-10-17" @default.
• W3100906713 title "FEATHERING INSTABILITY OF SPIRAL ARMS. II. PARAMETER STUDY" @default.
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• W3100906713 doi "https://doi.org/10.1088/0004-637x/792/2/122" @default.
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