Structural variations of extragalactic radio sources over large frequency ranges

Details Structural variations of extragalactic radio sources over large frequency ranges Structural variations of extragalactic radio sources over large frequency ranges

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.179..377s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 179, May 1977, p. 377-388.

Astronomy and Astrophysics

Astronomy

15

Extragalactic Radio Sources, Frequency Ranges, Radio Spectra, Radio Transmission, Scintillation, Interferometry, Quasars, Radio Telescopes, Spectral Energy Distribution, Visibility

Scientific paper

Frequency variations of the structures of extragalactic radio sources are studied by comparing 81.5-MHz interplanetary scintillation data and 408-MHz long-baseline interferometer visibilities with 5-km telescope results at 5 GHz. Over the range 81.5 MHz-5 GHz, extended components (at least 2 arcsec) are generally more dominant at the lower frequency. Over the range 408 MHz-5 GHz, there is good evidence for the existence in some cases of extended steep-spectrum regions which are visible at 408 MHz but contribute a negligible fraction of the flux at 5 GHz.

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