A Principle Component Analysis of Galaxy Properties from a Large, Gas-Selected Sample

Figure 7

The PCA results for 1022 galaxies from ALFALFA and SDSS without colors. Here we only show the strongest ones, PC1 and PC2, because other principal components are not significant by PCA criterions. PC1 is well correlated with all the variables. In this plot, 𝑃𝐶1=0.45log𝑅₅₀+0.47log𝑅₉₀+0.45log𝐿_𝑟+0.44log𝑀_HI+0.43log𝑀_𝑑 and 𝑃𝐶2=−0.59log𝑅₅₀−0.43log𝑅₉₀+0.28log𝐿_𝑟+0.18log𝑀_HI+0.60log𝑀_𝑑.