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Unbiased understandings of molecular distributions in a disk/envelope systemof a low-mass protostellar source are crucial for investigating physical andchemical evolution processes. We have observed 23 molecular lines toward theClass 0 protostellar source L483 with ALMA and have performed principalcomponent analysis (PCA) for their cube data (PCA-3D) to characterize theirdistributions and velocity structures in the vicinity of the protostar. The sumof the contributions of the first three components is 63.1 %. Mostoxygen-bearing complex-organic-molecule lines have a large correlation with thefirst principal component (PC1), representing the overall structure of thedisk/envelope system around the protostar. Contrary, the C18O and SiO emissionsshow small and negative correlations with PC1. The NH2CHO lines stand outconspicuously at the second principal component (PC2), revealing more compactdistribution. The HNCO lines and the high excitation line of CH3OH have asimilar trend for PC2 to NH2CHO. On the other hand, C18O is well correlatedwith the third principal component (PC3). Thus, PCA-3D enables us to elucidatethe similarities and the differences of the distributions and the velocitystructures among molecular lines simultaneously, so that the chemicaldifferentiation between the oxygen-bearing complex organic molecules and thenitrogen-bearing ones is revealed in this source. We have also conducted PCAfor the moment 0 maps (PCA-2D) and that for the spectral line profiles(PCA-1D). While they can extract part of characteristics of the molecular-linedata, PCA-3D is essential for comprehensive understandings. Characteristicfeatures of the molecular-line distributions are discussed on NH2CHO.

Molecular Distributions of the Disk/Envelope System of L483: Principal Component Analysis for the Image Cube Data