Spectra of compact and extended components of powerful extragalactic radio sources

Details Spectra of compact and extended components of powerful extragalactic radio sources Spectra of compact and extended components of powerful extragalactic radio sources

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.178..265g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 178, Feb. 1977, p. 265-270.

Astronomy and Astrophysics

Astronomy

18

Astronomical Spectroscopy, Extragalactic Radio Sources, Microwave Spectra, Radio Astronomy, Spectrum Analysis, Astronomical Models, Brightness Temperature, Extraterrestrial Radio Waves, High Resolution, Radiant Flux Density, Radio Telescopes

Scientific paper

Detailed spectral information over the interval from 327 MHz to 5 GHz is presented for the extragalactic radio sources 3C 33, 79, 154, 172, and 215. The data obtained were derived from high-resolution occultation and interplanetary-scintillation observations at both wavelengths. The structure of each source is described in detail, particularly compact heads, continuous bridges, and extended as well as short tails. The amount of flux density contributed by each component is estimated, and the spectra of heads, bridges, and tails within each source are compared. The results show that four of the sources exhibit continuous bridges at 327 MHz, the spectra of three of the bridges are steeper than those of the respective compact heads, and the lengths of the short tails in all four cases are nearly the same at the two frequencies. It is suggested that the compact scintillating objects detected within the heads of two of the examined sources may be transient features that result from activity leading to discrete injections of radio clouds near the outer edges of the sources.

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