Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.181..599b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 181, Dec. 1977, p. 599-610.
Astronomy and Astrophysics
Astronomy
71
Astronomical Maps, Extragalactic Radio Sources, Galactic Radiation, Radio Galaxies, Astronomical Spectroscopy, Brightness Temperature, Galactic Structure, Luminous Intensity, Relief Maps, Telescopes
Scientific paper
The radio source 3C 31 has recently been mapped with the Cambridge One-Mile Telescope at 0.4 and 1.4 GHz and with the 5-km Telescope at 2.7, 5.0, and 15 GHz. Jets have been found extending from opposite sides of an unresolved central source which is coincident with the galaxy NGC 383. The jets merge into complex outer regions of low surface brightness and total angular extent about 30 arcmin, much larger than shown by previous observations. Between 0.4 and 1.4 GHz, the spectra of the outer regions steepen with distance from the central source, and the change in spectral index is about 1.0. Results at 10 GHz suggest that the spectra do not steepen further at higher frequencies, implying that the steepening cannot be attributed simply to energy losses in the radiating electrons.
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