Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.0301b&link_type=abstract
American Astronomical Society, 180th AAS Meeting, #03.01; Bulletin of the American Astronomical Society, Vol. 24, p.730
Astronomy and Astrophysics
Astronomy
Scientific paper
The idea that different types of active galactic nuclei are similar objects seen from different angles has become a popular one in recent years. For QSOs, such "unification schemes" have been based on radio morphology, with compact flat spectrum sources (core dominated QSOs; CDQs) interpreted as the end-on versions of extended steep spectrum sources (lobe dominated QSOs; LDQs). Because the optical properties of LDQs and CDQs are significantly different in a statistical sense, this model demands that the emission of optical continuum and line radiation be anisotropic, with different lines showing differing degrees of anisotropy. Also, the fact that LDQs show broader lines than do CDQs is interpreted as evidence that the majority of the motion of the broad line clouds is in a disk perpendicular to the radio jets. Although radio quiet QSOs, which make up 90\ emission by which to deduce their orientation, a simple test of this model can be made for a complete sample. The model predicts that for objects with a given luminosity in the [O III] lambda 5007 line, the equivalent width of that line should be correlated with the FWHM of the Hβ line. That is, the objects seen end-on should have relatively narrower permitted lines and relatively weaker forbidden lines (due to enhancement of the continuum) than objects seen edge-on. This test has been performed for the 70 radio quiet objects in the BQS sample using emission line measurements published by Boroson and Green (1992). The data show no correlation, implying either that the geometry of radio loud and radio quiet QSOs is different or that the optical properties of CDQs and LDQs differ inherently, and not because of orientation.
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