Anisotropic optical and X-ray emission in quasars

Details Anisotropic optical and X-ray emission in quasars Anisotropic optical and X-ray emission in quasars

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.338..485j&link_type=abstract

Nature (ISSN 0028-0836), vol. 338, April 6, 1989, p. 485-487.

Astronomy and Astrophysics

Astronomy

38

Anisotropy, Astronomical Models, Astronomical Spectroscopy, Quasars, X Ray Astronomy, Continuous Radiation, Emission Spectra, Forbidden Transitions, Luminosity, Oxygen Spectra, Relativistic Effects

Scientific paper

Recent spectroscopic observations of 46 radio-loud quasars are used here to show that the equivalent width of the forbidden O III 5007-A emission line is strongly anticorrelated with the degree of radio core prominence R, which has been found to be a statistical indicator of orientation relative to the line of sight. This observed anticorrelation shows that the quasar continuum is anisotropic and provides important evidence in favor of relativistic-beaming unified schemes. It is also shown that the strength of the forbidden O III emission line is independent of R, consistent with unified schemes.

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