xGASS: HI fueling of star formation in disk-dominated galaxies

Abstract

We introduce a method to estimate the HI mass within the optical radius of disk galaxies from integrated HI spectra, with an uncertainty of 0.09 dex. We use these estimates to study how inner HI fuels star formation in late-type disk galaxies. We find that star formation rate (SFR) at a given stellar mass ($M_{\ast }$) is well correlated with the inner HI surface density (${\Sigma }_{\mathrm{HI},\mathrm{in}}$) and inner HI mass-to-stellar mass ratio. For the massive ($M_{\ast }>10^{10}{M}_{\odot }$) disk galaxies, higher SFR at a given stellar mass is also related with higher efficiency of converting inner HI to molecular gas, but no such correlation is found for the total HI mass. The highest ${\Sigma }_{\mathrm{HI},\mathrm{in}}$ and the fastest depletion of the total neutral gas within the optical disks are found in the most compact and star-forming disk galaxies at a given stellar mass. These results highlight the important role of inner HI as an intermediate step of fueling star formation in disk galaxies.

arXiv comment13 pages, 12 figures, accepted for publication at ApJ

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