Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224l..51k&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 224, Sept. 1, 1978, p. L51-L54. Research supported by the National R
Astronomy and Astrophysics
Astronomy
10
Galactic Nuclei, Galactic Radiation, Radio Sources (Astronomy), Astronomical Maps, Linear Polarization, Microwave Emission, Polarized Electromagnetic Radiation
Scientific paper
Interferometric observations at 8085 MHz of the strong compact radio source (designated 49.1+58) in the nucleus of M82 are reported which were performed in 1971 and repeated in 1975 to search for flux-density variations. High-sensitivity 8-GHz maps of M82 are presented, and upper limits of 3% along the main radio ridge and 0.3% for 49.1+58 are placed on the linear polarization. It is found that the flux density from 49.1+58 decreased by about 14% in four years; the relative stability of the source is taken to suggest that the source is not expanding and not dynamically confined. A very high ratio of relativistic- to cold-plasma density (no less than about 4000) is determined, indicating that the particle generator in this source is probably the strong magnetic field of a supermassive object which is presumably in a highly collapsed state. It is concluded that there is considerable disorder in the magnetic-field structure of 49.1+58.
Clarke J. N.
Kronberg Philipp P.
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