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

Abstract Unbiased understanding of molecular distributions in a disk/envelope system low-mass protostellar source is crucial for investigating physical and chemical evolution processes. We have observed 23 lines toward the Class 0 L483 with ALMA performed principal component analysis (PCA) their cube data (PCA-3D) to characterize velocity structures vicinity protostar. The sum contributions first three components 63.1%. Most oxygen-bearing complex organic molecule large correlation (PC1), representing overall structure around Contrary, C 18 O SiO emissions show small negative correlations PC1. NH 2 CHO stand out conspicuously at second (PC2), revealing more compact distribution. HNCO high-excitation line CH 3 OH similar trend PC2 CHO. On other hand, well correlated third (PC3). Thus, PCA-3D enables us elucidate similarities differences among simultaneously, so that differentiation between molecules nitrogen-bearing ones revealed this source. also conducted PCA moment maps (PCA-2D) spectral profiles (PCA-1D). While they can extract part characteristics data, essential comprehensive understandings. Characteristic features are discussed on