NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-27 T03:43:49 PDT
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For refcode 2018MNRAS.475.5603S:
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Copyright by Royal Astronomical Society. 2018MNRAS.475.5603S Local stability of galactic discs in modified dynamics Shenavar, Hossein; Ghafourian, Neda Abstract. The local stability of stellar and fluid discs, under a new modified dynamical model, is surveyed by using WKB approximation. The exact form of the modified Toomre criterion is derived for both types of systems and it is shown that the new model is, in all situations, more locally stable than Newtonian model. In addition, it has been proved that the central surface density of the galaxies plays an important role in the local stability in the sense that low surface brightness (LSB) galaxies are more stable than high surface brightness (HSBs). Furthermore, the growth rate in the new model is found to be lower than the Newtonian one. We found that, according to this model, the local instability is related to the ratio of surface density of the disc to a critical surface density Sigma^crit^. We provide observational evidence to support this result based on star formation rate in HSBs and LSBs. Key words: instabilities, methods: analytical, methods: data analysis, galaxies: kinematics and dynamics, galaxies: spiral, galaxies: star formation
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