Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230l..67f&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 230, June 1, 1979, p. L67-L71.
Astronomy and Astrophysics
Astrophysics
43
Collimators, Cygnus Constellation, Heao 1, Radio Galaxies, X Ray Sources, Galactic Clusters, Modulation, Scanning
Scientific paper
The HEAO 1 modulation-collimator data associate the X-ray emission from the Cygnus A region (4U 1957 + 40) with a small area including the radio galaxy. The source appears to be extended, with a size of about 2 arcmin; it may have a complex geometry. Any point-source component must have a flux no greater than 1.3 UFU. A lower limit of 1 microgauss is placed on the magnetic field in the radio lobes, based on the upper limit on the X-ray flux due to inverse Compton scattering of radio electrons on the 2.7-K microwave background radiation. The X-ray emission is more likely due to driven accretion of the intercluster gas onto the giant cD radio galaxy. Therefore this source appears to be similar to the Virgo and Perseus clusters. The density derived for the X-ray-emitting gas is too small for its thermal pressure to confine the radio source.
Doxsey Rodger Evans
Fabbiano Giuseppina
Johnston Malcolm
Schwartz Dana A.
Schwarz John
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