论文标题
XGASS：在磁盘为主导的星系中加油恒星形成
xGASS: HI fueling of star formation in disk-dominated galaxies
论文作者
论文摘要
我们介绍了一种估计来自集成的HI光谱的磁盘星系光半径内的HI质量的方法，不确定性为0.09 DEX。我们使用这些估计值来研究内部燃料恒星在晚期磁盘星系中的形成。我们发现在给定的恒星质量（$ M _*$）处的星形形成率（SFR）与内部HI表面密度（$σ_{\ rm hi，in} $）和内部HI质量质量与恒星质量比非常相关。对于巨大的（$ m _*> 10^{10} m _ {\ odot} $）磁盘星系，给定恒星质量的较高的SFR也与将内部HI转换为分子气的较高效率相关，但是对于总HI质量而言，没有这种相关性。最高的$σ_ {\ rm hi，in} $，光盘内总中性气体的最快耗竭是在给定的恒星质量下最紧凑和最紧凑和形成的恒星磁盘的最快耗竭。这些结果突出了内部HI作为在磁盘星系中加油恒星形成的中间步骤的重要作用。
We introduce a method to estimate the HI mass within the optical radius of disk galaxies from integrated HI spectra, with an uncertainty of 0.09 dex. We use these estimates to study how inner HI fuels star formation in late-type disk galaxies. We find that star formation rate (SFR) at a given stellar mass ($M_*$) is well correlated with the inner HI surface density ($Σ_{\rm HI,in}$) and inner HI mass-to-stellar mass ratio. For the massive ($M_*>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 $Σ_{\rm HI,in}$ 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.
