Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.222..149b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 222, Sept. 1, 1986, p. 149-166.
Astronomy and Astrophysics
Astronomy
47
Astronomical Models, Quasars, Radio Emission, Relativistic Velocity, Astronomical Spectroscopy, Constraints
Scientific paper
The authors discuss relativistic beaming models in the light of VLA measurements of the extended structure round a sample of 135 flat-spectrum quasars. Two-thirds of these have structure on scales in excess of 2 arcsec. It is argued that these results support the Orr and Browne (1982) view that the parent population of flat-spectrum (core-dominated) quasars are steep-spectrum (lobe-dominated) quasars. Predictions of the Orr and Browne scheme are found to be in fair agreement with the observed strength and size of the extended radio emission. The core-dominated sources are more asymmetric than lobe-dominated sources and this may be caused by modest relativistic motion (β ≡ 0.20) within radio lobes.
Browne Ian W. A.
Perley Richard A.
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