Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...200..790r&link_type=abstract
Astrophysical Journal, vol. 200, Sept. 15, 1975, pt. 1, p. 790-802.
Astronomy and Astrophysics
Astronomy
1
Astronomical Maps, Microwave Emission, Periodic Variations, Radiant Flux Density, Radio Sources (Astronomy), Angular Distribution, Arcs, Microwave Spectra, Radiation Measurement, Radio Astronomy, Radio Spectra, Tables (Data)
Scientific paper
Results are reported for high-frequency (0.75, 1.40, 3.24, 6.63, and 10.63 GHz) flux-density measurements of about 100 radio sources exhibiting low-frequency cutoffs. At least three sources (4C 79.4, 4C 79.15, and PKS 2344+09) showed variable structure on a scale ranging from a fraction of an arcmin to as much as 15 arcmin which appears to change significantly on a time scale of several months. The visual fields of these sources and their companion components are searched for identifiable objects, and complete radio spectra as well as contour maps are presented for some of the sources. It is suggested that the variable structure may result from the existence of several emission centers that are highly variable in flux density but fixed in position.
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