Keoikantse Moses Mogotsi

Keoikantse Moses Mogotsi
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Keoikantse Moses Mogotsi

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Physics - Plasma Physics (1)
Physics - Fluid Dynamics (1)
Cosmology and Nongalactic Astrophysics (1)
Astrophysics of Galaxies (1)

Publications Authored By Keoikantse Moses Mogotsi

The velocity dispersion of cold interstellar gas, sigma, is one of the quantities that most radically affect the onset of gravitational instabilities in galaxy discs, and the quantity that is most drastically approximated in stability analyses. Here we analyse the stability of a large sample of nearby star-forming spirals treating molecular gas, atomic gas and stars as three distinct components, and using radial profiles of sigma_CO and sigma_HI derived from HERACLES and THINGS observations. We show that the radial variations of sigma_CO and sigma_HI have a weak effect on the local stability level of galaxy discs, which remains remarkably flat and well above unity, but is low enough to ensure (marginal) instability against non-axisymmetric perturbations and gas dissipation. Read More