Apparent 'superrelativistic' expansion of the extragalactic radio source 3C 345

Details Apparent 'superrelativistic' expansion of the extragalactic radio source 3C 345 Apparent 'superrelativistic' expansion of the extragalactic radio source 3C 345

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206l..75w&link_type=abstract

Astrophysical Journal, vol. 206, June 1, 1976, pt. 2, p. L75-L78.

Astronomy and Astrophysics

Astrophysics

31

Extragalactic Radio Sources, Quasars, Relativistic Effects, Astronomical Models, Brightness, Expansion, Fine Structure, Interferometry, Light Speed

Scientific paper

The compact extragalactic radio source 3C 345 was observed by very-long-baseline interferometry (wavelength about 3.8 cm) at 12 epochs distributed over the nearly four-year period from February 1971 to October 1974. For one of these epochs, the multibaseline data were sufficient to allow the brightness distribution to be estimated in a model-independent manner; the resultant distribution was clearly dominated by two components. The remaining sets of data were also represented adequately by two-component models. The angular separation of the two components increased during this period from about 1.00 to 1.30 milliarcsec, corresponding to an apparent average speed of expansion of approximately 2.5 c at a fixed position angle of 105 (plus or minus 5) deg. These results, coupled with the fact that contraction has never been observed, seem difficult to reconcile with the so-called Christmas-tree model of the 'superrelativistic' expansion of extragalactic radio sources.

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