XGASS: H i Fueling of Star Formation in Disk-dominated Galaxies

Jing Wang, Barbara Catinella, Amélie Saintonge, Zhizheng Pan, Paolo Serra, Li Shao

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20 Citations (Scopus)


We introduce a method to estimate the H i mass within the optical radius of disk galaxies from integrated H i spectra, with an uncertainty of 0.09 dex. We use these estimates to study how inner H i fuels star formation in late-Type disk galaxies. We find that star formation rate (SFR) at a given stellar mass (M ) is well correlated with the inner H i surface density and inner H i mass-To-stellar mass ratio. For the massive (M > 1010 M o) disk galaxies, higher SFR at a given stellar mass is also related to higher efficiency of converting inner H i to molecular gas, but no such correlation is found for the total H i mass. The highest 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 H i as an intermediate step of fueling star formation in disk galaxies.

Original languageEnglish
Article number63
JournalThe Astrophysical Journal
Issue number1
Publication statusPublished - 10 Feb 2020


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