2 papers
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…
astro-ph2004
Distributions of Galaxy Spectral Types in the Sloan Digital Sky Survey
Ching-Wa Yip, Andrew Connolly, Alex Szalay +12
We perform an objective classification of 170,000 galaxy spectra in the Sloan Digital Sky Survey (SDSS) using the Karhunen-Loève (KL) transform. With about one-sixth of the total s…