Images of the Hot Spots in Cygnus A at 87 GHz

Details Images of the Hot Spots in Cygnus A at 87 GHz Images of the Hot Spots in Cygnus A at 87 GHz

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...483..783w&link_type=abstract

Astrophysical Journal v.483, p.783

Astronomy and Astrophysics

Astronomy

5

Galaxies: Individual Name: Cygnus A, Radio Continuum: Galaxies, Techniques: Interferometric

Scientific paper

We used the Berkeley-Illinois-Maryland Association array to map Cygnus A at 87 GHz with 0."4 angular resolution. The hot spots at the working surfaces in the radio lobes show spectral index gradients from -0.6 to -1.1 between 87 and 5 GHz, which suggests significant synchrotron aging in the hot spots. The data do not show a marked spectral break between 5 and 87 GHz, however, which suggests a continuous injection of high-energy relativistic particles into both compact and extended hot spots on timescales less than 3 x 104 yr.

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