Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.200.1067o&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 200, Sept. 1982, p. 1067-1080.
Astronomy and Astrophysics
Astronomy
424
Beams (Radiation), Quasars, Radio Astronomy, Relativistic Effects, Radio Spectra, Red Shift, Statistical Distributions
Scientific paper
The statistical predictions of a unified scheme for the radio emission from quasars are explored. This scheme attributes the observed differences between flat- and steep-spectrum quasars to projection and the effects of relativistic beaming of the emission from the nuclear components. A simple quasar model consisting of a compact relativistically beamed core with spectral index zero and unbeamed lobes, spectral index - 1, is used to predict the proportion of flat-spectrum sources in flux-limited samples selected at different frequencies. In this model this fraction depends on the core Lorentz factor, gamma, and it is found that a value of approximately 5 gives satisfactory agreement with observation. In a similar way the model is used to construct the expected number/flux density counts for flat-spectrum quasars from the observed steep-spectrum counts. Again, good agreement with the observations is obtained if the average core Lorentz factor is about 5. It is concluded that the statistical properties of quasars are entirely consistent with the predictions of simple relativistic-beam models.
Browne Ian W. A.
Orr J. L. M.
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