xCOLD GASS and xGASS. Metallicity gradients

The xGASS and xCOLD GASS surveys have measured the atomic (HI) and molecular gas (H_2_) content of a large and representative sample of nearby galaxies (redshift range of 0.01

xGASS与xCOLD GASS巡天已针对大尺度且具有代表性的邻近星系样本（红移范围为0.01），测定了其中性氢（HI）与分子气体（H₂）的含量。