Eigenspectra of the SDSS DR1 quasars

Details Eigenspectra of the SDSS DR1 quasars Eigenspectra of the SDSS DR1 quasars

2004-03-23

arxiv.org/abs/astro-ph/0403560v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, "AGN Physics with the Sloan Digital Sky Survey" ASP Conference Series

Scientific paper

We construct eigenspectra from the DR1 quasars in the SDSS using the Karhunen-Lo\`eve (KL) transform (or Principal Component Analysis, PCA) in different redshift and luminosity bins. We find that the quasar spectra can be classified, by the first two eigenspectra, into a continuous sequence in the variation of the spectral slope. We also find a dependence on redshift and luminosity in the eigencoefficients. The dominant redshift effect is the evolution of the blended Fe~II emission (optical) and the Balmer continuum (the ``small-bump'', $\lambda_{rest} \approx 2000-4000$\AA), while the luminosity effect is related to the Baldwin effect. Correlations among several major broad emission lines are found, including the well-known ``Eigenvector-1''.

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