Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.209..869s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 209, Aug. 15, 1984, p. 869-879.
Astronomy and Astrophysics
Astronomy
29
Radiant Flux Density, Radio Bursts, Radio Sources (Astronomy), Variable Stars, Very Long Base Interferometry, Astronomical Maps, Astronomical Models, Flux Quantization, Jets, Optical Emission Spectroscopy
Scientific paper
Single baseline interferometers and the MERLIN instrument at Jodrell Bank have been used to investigate the flux density and structure variations in SS433. The interferometers enabled the flux density variations and spectra of an unresolved (< 0.3 arcsec) core and an arcsec halo or jet to be measured in 1979 August. Subsequent observations with MERLIN show structures confirming the twin-jet models for the optical emission. The angular velocity of the moving knots of radio emission can be combined with the linear velocity of the optical clouds to give a distance of 4.9±0.2 kpc. The velocity of the knots is constant and they appear to move along a channel formed by continuous jets from the core of SS433. The brightness of the knots decays with a time constant of 35 days, or alternatively as (time)-1.8, a flatter power law than expected for adiabatic expansion.
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