The Angular Structure of the Quasar 3C 147

Continuous, twenty-four hour, observations of the quasi-stellar radio source 3C 147 have been made at 1422 MHz and 2694 MHz with the Jodrell Bank–Malvern long baseline interferometer. The visibility function obtained at 2694 MHz shows that the source has a complex structure at this frequency. Eighty per cent of the flux is emitted by 3C 147B, consisting of two small components $$({0}^{\prime\prime{}}.07\,\times\,{0}^{\prime\prime{}}.04)$$ separated by 0″.14 in position angle 55 °. The remaining 20 per cent of the flux is emitted by a larger component, 3C 147A, separated from 3C 147B by 0″.55. Comparison with other very long baseline observations suggests that the angular separation of the components of 3C 147B is strongly dependent on frequency.