Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399l..15b&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 399, no. 1, p. L15-L17.
Astronomy and Astrophysics
Astrophysics
20
Orientation, Quasars, Radio Emission, Monte Carlo Method, Spectral Emission, Spectral Line Width
Scientific paper
The model of radio-loud quasars which unifies lobe- and core-dominated objects through orientation has been used in the past to interpret observations of optical emission lines. This approach leads to a prediction that objects with broader permitted lines should have forbidden lines with larger equivalent width. Using recent observations of a complete sample of bright, low-redshift, radio-quiet quasars, it is shown that this correlation is not present. A Monte Carlo simulation indicates that the observed lack of correlation is inconsistent with the proposed orientation dependence for these properties. One possible explanation is that radio-loud quasars contain a beamed continuum component which is lacking in radio-quiet quasars. A second possibility is that the correlations seen in radio-loud quasars are not due to orientation but to intrinsic differences. The same test applied to a radio-loud sample shows only a weak correlation, suggesting that the variation in at least one of the emission-line properties is not due to orientation.
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