2 papers
astro-ph2004
Eigenspectra of the SDSS DR1 quasars
Ching-Wa Yip, Andrew Connolly, Daniel Vanden Berk +4
We construct eigenspectra from the DR1 quasars in the SDSS using the Karhunen-Loève (KL) transform (or Principal Component Analysis, PCA) in different redshift and luminosity bins.…
astro-ph2003
Luminosity and Redshift Dependence of Quasar Spectral Properties
D. E. Vanden Berk, C. -Y. Yip, A. J. Connolly +2
Using a large sample of quasar spectra from the SDSS, we examine the composite spectral trends of quasars as functions of both redshift and luminosity, independently of one another…