Accession Number : AD0726486

Title :   High Resolution Observations of Compact Radio Sources at 6 and 18 CM,

Corporate Author : OWENS VALLEY RADIO OBSERVATORY PASADENA CALIF

Personal Author(s) : Kellermann,K. I. ; Jauncey,D. L. ; Cohen,M. H. ; Shaffer,D. B. ; Clark,B. G.

Report Date : 1971

Pagination or Media Count : 55

Abstract : The small scale structure of extragalactic radio sources has been studied at 18 and 6 cm wavelengths using a tape recording interferometer. At the longest antenna spacing, 10,536 km, the baselines at 6 cm was 176 million wavelengths and the resolution was about 0.0004 arc seconds for the stronger sources. Many sources, including optically identified galaxies and quasars, are found to have several distinct components of widely differing size in the range from the few hundredths of a second of arc to the limit of our resolution. Many sources, including 0106+01, 3C 273, 3C279, 1555+00, 2145+06, 3C 446, 3C 454.3, and 2345-16 all contain components which are unresolved on the longest baseline are less than .0004 arc sec. in diameter. Observations at shorter wavelengths are required to resolve these sources. Because the maximum brightness temperature is limited to 10 to the 12th power K, by inverse Compton scattering, baselines no greater than the diameter of the earth are probably adequate to resolve all of the stronger extragalactic sources. (Author)

Descriptors :   (*EXTRATERRESTRIAL RADIO WAVES, SOURCES), INTERSTELLAR MATTER, GALAXIES, RADIO INTERFEROMETERS, X BAND, K BAND, VISIBILITY, ASTRONOMY, TABLES(DATA)

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE