Multifrequency VLBI observations of 4C 39. 25 - a superluminal source without a well-defined core
The radio source 4C 39.25 has been shown by Shaffer et al. to contain both superluminally moving and stationary components. The results of VLBI observations of 4C 39.25 at 1.35 cm at epoch 1983.77 are presented. Comparison with the 2.8 cm maps of Shaffer et al. (1987) indicates that none of the components possesses the characteristics normally associated with the compact core of a superluminal source. When combined with the steep spectrum at frequencies above 10 GHz and the two-sided arcsecond-scale jet, it is inferred from the lack of a well-defined core that 4C 39.25 represents a source intermediate between more typical superluminal sources and symmetric extended radio sources with weak cores. A relativistic jet model is possible only if the jet bends by over 50 deg or decelerates as it moves outward, or both. 21 references.
- Research Organization:
- Boston Univ., MA; Interferometrics, Inc., Vienna, VA; Onsala Rymdobservatorium, Sweden
- OSTI ID:
- 5831424
- Journal Information:
- Astrophys. J.; (United States), Vol. 319
- Country of Publication:
- United States
- Language:
- English
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