Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...20112506s&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #125.06; Bulletin of the American Astronomical Society, Vol. 34, p.1309
Astronomy and Astrophysics
Astronomy
Scientific paper
A unique set of UV-optical spectrograms of 22 low redshift QSOs are investigated using principal component analysis. We find three significant principal components over the broad wavelength range from Lyα to Hα . They together account for about 78% of the sample intrinsic variance. We present strong arguments that the first principal component represents the Baldwin effect, relating equivalent widths to the luminosity (i.e. accretion rate), but only emission-line cores are involved. The second component represents continuum variations, probably dominated by intrinsic reddening. The third principal component directly relates QSO UV properties to the optical principal component 1 found by Boroson & Green (1992). It is the primary cause of scatter in the Baldwin relationships. It is also directly related to broad emission-line width and soft X-ray spectral index, and therefore probably driven by Eddington accretion ratio. We also show correlations between the integrated line and continuum fluxes after host galaxy contamination is removed.
Robinson Emma L.
Shang Zhaohui
Wills Beverley J.
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