First 7-MILLIMETER VLBI Observations of the Peculiar Superluminal Radio Source 4C39.25

Details First 7-MILLIMETER VLBI Observations of the Peculiar Superluminal Radio Source 4C39.25 First 7-MILLIMETER VLBI Observations of the Peculiar Superluminal Radio Source 4C39.25

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...271...93a&link_type=abstract

Astronomy and Astrophysics, Vol.271, NO. 1/APRI, P. 93, 1993

Astronomy and Astrophysics

Astrophysics

16

Scientific paper

On sub-milliarcsecond 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 1.3 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.

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