Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254...93m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Jan. 1, 1992, p. 93-110.
Astronomy and Astrophysics
Astronomy
62
Astronomical Photometry, Astronomical Spectroscopy, Luminosity, Quasars, Continuous Spectra, Forbidden Transitions, H Beta Line, Oxygen Spectra, Sky Surveys (Astronomy)
Scientific paper
Flux-calibrated spectra of 39 low-redshift quasars from the Bright Quasar Survey (BQS) have been used to study a near-complete data set of optically selected quasars. Statistical partial rank analysis shows that the forbidden O III luminosity is more intimately connected to the H-beta luminosity, L(H-beta), than to observed continuum luminosity, L(cont). L(H-beta) is thus considered to be a better measure than L(cont) of the photoionizing luminosity. The effects of an orientation-dependent L(cont) on the rest-frame emission-line equivalent widths, EW(H-beta), and EW(forbidden O III), have been studied. It is found that scatter in the L(H-beta) - L(cont) relation is not due to a range in broad-line covering factor, and is inconsistent with one simple orientation scheme unless objects with very high disk inclination angles are excluded by the BQS selection criteria. It is demonstrated that there exists a correlation between the full width at half maximum of the H-beta line and L(H-beta), providing evidence for a gravitationally bound H-beta-emitting region and a scaling M(central) approximately proportional to L.
Eales Steve
Miller Philip
Rawlings Steve
Saunders Richard
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