MERLIN radio observations of the quasar 3C 273

Details MERLIN radio observations of the quasar 3C 273 MERLIN radio observations of the quasar 3C 273

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.216..679f&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 216, Oct. 1, 1985, p. 679-690.

Other

16

Extragalactic Radio Sources, Jets, Quasars, Radio Emission, Astronomical Maps, Astronomical Models, Interstellar Magnetic Fields, Radio Spectra, Radio Telescopes, Relativistic Velocity, Self Absorption

Scientific paper

MERLIN observations of the radio jet of the quasar 3C 273 at 408 and 1666 MHz are presented. Most of the important features previously seen at 408 MHz are confirmed. The jet extends from 12 to 23 arcsec from the quasar, and has a single bright head at 408 MHz. At the higher resolution of the 1666-MHz map the head is seen to consist of at least three subcomponents, the brightest of which is set back from the outermost point of the jet. The ridgeline of emission shows oscillations from side to side ('wiggles'), the wavelength of which decreases markedly as the bright head is approached. If the wiggle is due to precession of the beam, the change in wavelength requires a decrease in velocity as the head is approached. If on the other hand the wiggle is a form of Kelvin-Helmholtz instability, the flow may be at constant speed, but must be mildly relativistic, with gamma approximately 1.5. The equipartition magnetic field increases down the jet from 10 to 30 nT, and synchrotron self-absorption must occur at 40 MHz. Emission observed at frequencies between 12 and 40 MHz must originate in a different, larger region. The existence of a radio source 8 arcmin from 3C273 is confirmed, but it is suggested that it is unconnected with the quasar.

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