VLA survey of strong radio sources
The VLA has been used to survey the structures of 360 strong high-frequency radio sources at 1480 and 4900 MHz. Of those sources, 250 are found to contain at least 90% of their flux density in an unresolved component (< or approx. =1 arcsec), while the remaining 110 sources are considered to be resolved. Positions and structural information for these sources are given, and maps of 20 of the resolved objects are shown. The VLA data have been combined with other structural information available for sources listed in the Parkes and S surveys in order to study a complete sample of 444 extragalactic objects having flux densities greater than 1 Jy at 5 GHz. The unresolved radio sources in the flux-limited sample have a median spectral index of ..cap alpha.. = -0.09 (S/sub ..nu../approx...nu../sup ..cap alpha../) at centimeter wavelengths, while the resolved sources have a median index of ..cap alpha.. = -0.73. The unresolved radio galaxies, in general, have steeper spectra than both the resolved and the unresolved quasars. Finally, there seems to be a lack of quasars having radio sources with large linear diameters beyond zapprox. =1.
- Research Organization:
- E. O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, D.C. 20375
- OSTI ID:
- 6183164
- Journal Information:
- Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 86:7; ISSN ANJOA
- Country of Publication:
- United States
- Language:
- English
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