3C138 - Multifrequency Observations of the Suggested Naked Jet Compact Steep-Spectrum Source

Details 3C138 - Multifrequency Observations of the Suggested Naked Jet Compact Steep-Spectrum Source 3C138 - Multifrequency Observations of the Suggested Naked Jet Compact Steep-Spectrum Source

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...274..752a&link_type=abstract

Astronomy and Astrophysics, Vol. 274, NO. 3/JUL(III), P. 752, 1993

Astronomy and Astrophysics

Astrophysics

13

Scientific paper

MERLIN observations of the compact steep-spectrum quasar 3C 138 at 0.151, 0.408, 1.666 and 4.995 GHz, a combined MERLIN-EVN image at 1.666 GHz and VLA polarisation images at 22.5 GHz are presented. The radio structure is unresolved at 0.151 and 0.408 GHz and shows no diffuse extended halo. At high frequencies its structure is largely linear and dominated by five distinct knots and compact components. We identify the two terminal components as compact radio lobes and infer that 3C 138 is a small double source with a two-sided jet structure rather than a `naked- jet'. The unusual steepening of the radio spectrum away from the nucleus is consistent with a young source, perhaps with dense jets, that has as yet not formed back-flowing cocoon associated with classical FRII radio sources. We also calculate the physical parameters in the components.

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