Conference paper Open Access

Does Angular Momentum Regulate the Atomic Gas Content in HI-deficient Spirals?

Murugeshan, Chandrashekar; Kilborn, Virginia; Obreschkow, Danail; Glazebrook, Karl; Lutz, Katharina; Dzudzar, Robert; Dénes, Helga

The neutral atomic hydrogen (HI) content of spiral galaxies has been observed to vary with environment, with spirals residing in high-density environments being more HI-deficient. This can been explained by environmental effects such as ram pressure stripping and tidal interactions, which remove HI from the discs of galaxies. However, some spirals in low-density environments have also been observed to have relatively low HI mass fractions. The low densities of the Intra Galactic 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 HI deficient? In this work, we show that for a sample of HI-deficient spirals from low-density environments, their specific angular momentum influences their HI gas content through its ability to regulate global star formation in their discs. We find that our sample of HI-deficient galaxies consistently follow the model predicted by Obreschkow et al., where the atomic gas fraction, in a symmetric equilibrium disc is a function of the global atomic stability parameter q, which depends on specific angular momentum. 

Files (546.9 kB)
Name Size
murugeshan.pdf
md5:67666717c18edfec25e7dd6be2d3cba3
546.9 kB Download
41
24
views
downloads
All versions This version
Views 4141
Downloads 2424
Data volume 13.1 MB13.1 MB
Unique views 3434
Unique downloads 2323

Share

Cite as