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Title:
The extended radio structure of compact extragalactic sources
Authors:
Perley, R. A.; Fomalont, E. B.; Johnston, K. J.
Affiliation:
AA(National Radio Astronomy Observatory, Socorro, NM), AB(National Radio Astronomy Observatory, Charlottesville, VA), AC(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, DC)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 255, Apr. 15, 1982, p. L93-L97. (ApJL Homepage)
Publication Date:
04/1982
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Astronomical Maps, Extragalactic Radio Sources, Radio Emission, Astronomical Catalogs, Bl Lacertae Objects, Brightness Distribution, Quasars, Very Long Base Interferometry
DOI:
10.1086/183776
Bibliographic Code:
1982ApJ...255L..93P

Abstract

The asymmetric disposition of associated arcsecond-extended radio emission has been established, by high-dynamic range maps of 21 luminous and core-dominated radio sources made with the VLA at 1.5 and 4.9 GHz, in contrast to the largely symmetric brightness distribution of large-angular size but less luminous sources. It is suggested that this radio emission asymmetry many kiloparsecs from the radio core may be due to a relativistic bulk flow Doppler enhancement. Alternatively, the asymmetry may be real.

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