Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...263..615r&link_type=abstract
Astrophysical Journal, Part 1, vol. 263, Dec. 15, 1982, p. 615-623.
Astronomy and Astrophysics
Astronomy
21
Elliptical Galaxies, Galactic Nuclei, Galactic Structure, Radio Astronomy, Very Long Base Interferometry, Brightness Temperature, Centimeter Waves, Relativistic Particles
Scientific paper
The nucleus and jet of M87 was mapped with an eight-station very long baseline interferometric array at 18 cm wavelength with high dynamic range. It was found that the nucleus of M87 consists of a core-jet structure with a peak brightness temperature greater than 10 to the 10th K. Emission is shown to extend for more than 50 milli-arcsec with a brightness temperature exceeding 10 to the 8th K along a position angle of 288 degrees, which precisely matches the position angle of the 20'' radio/optical/X-ray jet. In addition, the nucleus contains a significant structure of lower brightness at approximately the same position angle, although no counterjet is observed. By invoking relativistic beaming in order to enhance the jet and diminish the counterjet, it is shown that the jet must be aligned within about 60 degrees to our line of sight, and its flow velocity must exceed about 60% of the speed of light. The knots embedded in the 20'' jet contain no bright compact structures, and the sizes of the innermost knot (knot D) is between 0.1-0.3''.
Booth Roy S.
Hardee Philip E.
Johnston Ken J.
Owen Frazer N.
Reid Mark J.
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