Images of the BL Lacertae object 1749 + 701 at 5 GHz

Details Images of the BL Lacertae object 1749 + 701 at 5 GHz Images of the BL Lacertae object 1749 + 701 at 5 GHz

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...262....1b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 1, p. 1-7.

Astronomy and Astrophysics

Astronomy

4

Bl Lacertae Objects, Image Analysis, Quasars, Radio Jets (Astronomy), Continuous Spectra, Radio Sources (Astronomy)

Scientific paper

This paper presents images of 1749 + 701 from data obtained between 1980 and 1983 as a part of our VLBI program to monitor a subsample of BL Lac objects at 5 GHz. Our images show that this source has a complex structure with a jet pointing towards the northwest at a position angle of about -65 deg. The brightest component is growing in extension along this position angle. We suggest this to be the core and that the growing extension was caused by a shock generated during an outburst and moving out along the jet. From the extension rate, we obtain an angular separation speed of 0.18 mas/yr, which corresponds to an apparent transverse speed of 5 c. The distances and position angles of two outer components seem remarkably constant. The phenomenon can be understood through a model in which a relativistic jet bends such that its axis is very close to the line of sight in two points.

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