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20042009
most citedPhotometric redshift and classification for the XMM-COSMOS sources

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astro-ph2004

Spectral Classification of Quasars in the Sloan Digital Sky Survey: Eigenspectra; Redshift and Luminosity Effects

C. W. Yip, A. J. Connolly, D. E. Vanden Berk +10

We study 16,707 quasar spectra from the SDSS using the Karhunen-Loève (KL) transform (or Principal Component Analysis, PCA). The quasar eigenspectra of the full catalog reveal the…