Meter-wavelength observations of four giant radio galaxies

Details Meter-wavelength observations of four giant radio galaxies Meter-wavelength observations of four giant radio galaxies

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apjs...41..131p&link_type=abstract

Astrophysical Journal Supplement Series, vol. 41, Oct. 1979, p. 131-146. Research supported by the University of Maryland

Astronomy and Astrophysics

Astronomy

13

Astronomical Maps, Galactic Clusters, Galactic Radiation, Radio Galaxies, Radio Telescopes, Very High Frequencies, Astrometry, Brightness, Diffuse Radiation, Energy Dissipation, Radiation Distribution, Radio Sources (Astronomy)

Scientific paper

A method of aperture synthesis employing successive fan-beam scans taken with the E-W arm of the CLRO TPT array has been utilized to synthesize the brightness distribution of four large radio galaxies in the 26-100 MHz range. The head-tail radio galaxy 3C 129 was mapped at 43 and 73.8 MHz. These low-frequency maps show that the tail is both longer and brighter relative to the head than seen on Westerbork synthesis radio telescope (WSRT) maps taken at 610 and 1415 MHz. The maps indicate that the spectrum is straight at all points in the tail but steadily steepens with increasing distance from the head. The absence of curvature indicates that electron reacceleration or injection mechanisms combined with diffusion losses are required at all points in the tail. The double radio sources DA 240 and 3C 236 were mapped at 43 MHz and showed little change in structure from that observed by the WSRT at 610 MHz. This implies little change in spectral index in the outer lobes of these sources. The fractional flux of the central component of 3C 236 is much lower at 43 MHz than at 610 MHz.

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