Principal components in the PG-X-ray QSO sample

Details Principal components in the PG-X-ray QSO sample Principal components in the PG-X-ray QSO sample

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004adspr..34.2579s&link_type=abstract

Advances in Space Research, Volume 34, Issue 12, p. 2579-2583.

Astronomy and Astrophysics

Astrophysics

Scientific paper

We have performed a spectral principal component analysis for a complete sample of 22 low redshift QSOs with spectra from Lyα to Hα, and found three significant principal components, which account for ˜78% of the spectrum-to-spectrum variance. We present strong arguments that the first principal component represents the Baldwin effect, relating equivalent widths to the luminosity (i.e. accretion rate). The second component represents continuum variations, probably dominated by intrinsic reddening. The third principal component is directly related to broad emission-line width and X-ray spectral index, and therefore probably driven by Eddington accretion ratio, L/LEdd. The third set of relationships tie directly to the optical Principal Component 1 found by Boroson and Green [Boroson, T., Green, R.F., Astrophys. J. Suppl. 80, 109, 1992 (BG92)], and are the primary cause of scatter in the Baldwin relationships.

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