First 7 mm VLBI observations of the peculiar superluminal radio source 4C 39.25

On submilliarcsecond to milliarcsecond scales the quasar 4C 39.25 consists of two 'stationary' jet components a and c between which a component b is moving superluminally eastward towards a. From global VLBI observations at 7 mm we have obtained the first image of 4C 39.25 at this waveleng...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 1993-04, Vol.271 (1), p.93-100
Main Authors: Alberdi, A, Krichbaum, T P, Marcaide, J M, Witzel, A, Graham, D A, Inoue, M, Morimoto, M, Booth, R S, Ronnang, B O, Colomer, F
Format: Article
Language:English
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Summary:On submilliarcsecond to milliarcsecond scales the quasar 4C 39.25 consists of two 'stationary' jet components a and c between which a component b is moving superluminally eastward towards a. From global VLBI observations at 7 mm we have obtained the first image of 4C 39.25 at this wavelength. The high angular resolution of 7 mm-VLBI maps allows us to follow the motion of b towards a to separations not resolvable by VLBI-observations at longer wavelengths. The present observations also confirm the existence of a new jet component d detected recently with VLBI at 1.3 cm wavelength. The component is located 2.7 mas west of a and seems to have an inverted spectrum between l.3 cm and 7 mm. We suggest that d is either the 'core' of 4C 39.25 or is a recently ejected new jet component with a time-evolving spectrum.
ISSN:0004-6361