A PCA plus hierarchical K-means analysis of SDSS DR16 quasar spectra yields a value-added catalog of anomalous quasars in ten groups, with several new or enlarged rare classes and tentative metallicity and Eddington-ratio interpretations.
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Spectroscopic Quasar Anomaly Detection (SQuAD) I: Rest-Frame UV Spectra from SDSS DR16
A PCA plus hierarchical K-means analysis of SDSS DR16 quasar spectra yields a value-added catalog of anomalous quasars in ten groups, with several new or enlarged rare classes and tentative metallicity and Eddington-ratio interpretations.