Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975mnras.170..281t&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 170, Feb. 1975, p. 281-294.
Astronomy and Astrophysics
Astronomy
87
Galactic Nuclei, Galactic Structure, Radio Astronomy, Radio Galaxies, X Ray Sources, Astronomical Maps, Astronomical Models, Bremsstrahlung, Brightness Temperature, Emission Spectra, Spectrum Analysis, Telescopes
Scientific paper
The galaxy M87 has been observed at 5 GHz with the 5-km telescope at Cambridge, England. Maps of total intensity and polarized flux were made of the core component with a beam of 2 x 9 sec of arc. Compact structure, corresponding to knots in the optical jet, was found in the Np component. The knots are significantly polarized at 5 GHz, and models of the jet with particle densities exceeding 100 million per cu m are shown to be no longer tenable. The Sf component is more extended and contains no compact features. The nuclear source of flux density 4.0 fu was unresolved, but has an extension in the direction of the jet. The X-ray emission from M87 is most easily explained as thermal bremsstrahlung from an extended hot gas, which probably has sufficient pressure to confine the extended components of the radio source, but not the knots in the jet. A model in which fast particles and magnetic fields escape from the knots at speeds comparable with that of light is proposed.
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