AGN @ Wyoming

Spectral Principal Component Analysis (SPCA) of QSO Spectra

The SPCA results of 18 QSOs are shown below. The three significant spectral pincipal components are available to download. The wavelength (angstrom) is in logarithm scale and the flux is in normalized nuFnu. For more information, please refer to
"The Baldwin Effect and Black Hole Accretion: A Spectral Principal Component Ana lysis of a Complete Quasar Sample"
Shang, Z., Wills, B. J., Robinson, E. L., Wills, D., Laor, A., Xie, B., and Yuan, J.
2003, ApJ, 586, 52, (PDF).

SPCA results
SPCA results for the UV-optical spectra of 18 QSOs.  The numbers in parentheses are the percentages of the sample intrinsic variance that are accounted for by each principal component.  Each panel presents the spectrum with the full ordinate range (left-hand scale), and scaled to show details of the weaker features (right-hand scale).  The dashed vertical lines indicate the alignment at the HeII (1640) feature, at the peak of the FeII(opt) feature, and at H-beta.
(Figure 3 in Shang et al. 2003, ApJ, 586, 52, Postscript figure)


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Spectral

Spectral Principal Component 1
FITS  ASCII

Spectral Principal Component 2
FITS  ASCII

Spectral Principal Component 3
FITS  ASCII

Mean Spectrum
FITS  ASCII

Standard Deviation Spectrum
FITS  ASCII