Angular momentum regulates H i gas content and H i central hole size in the discs of spirals

Abstract:

The neutral atomic hydrogen (H i) content of spiral galaxies has been observed to vary with environment, with more H i-deficient spirals residing in high-density environments. This can be attributed to environmental effects such as ram pressure stripping and tidal interactions, which remove H i from the discs of galaxies. However, some spirals in low-density environments have also been observed to have relatively low H i mass fractions. The low densities of the intergalactic medium and lack of nearby galaxies in such environments make ram pressure stripping and tidal interactions unlikely candidates of gas removal. What then could be making these spirals H i deficient? Obreschkow et al. introduced a parameter-free model for the neutral atomic gas fraction (fatm), in a symmetric equilibrium disc as a function of the global atomic stability parameter (q), which depends on specific angular momentum. In …

Año de publicación:

2019

Keywords:

Fuente:

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