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Title:
Observations of BL Lacertae from the Geodetic VLBI Archive of the Washington Correlator
Authors:
Tateyama, C. E.; Kingham, K. A.; Kaufmann, P.; Piner, B. G.; de Lucena, A. M. P.; Botti, L. C. L.
Publication:
Astrophysical Journal v.500, p.810 (ApJ Homepage)
Publication Date:
06/1998
Origin:
APJ
ApJ Keywords:
GALAXIES: JETS, GALAXIES: BL LACERTAE OBJECTS: INDIVIDUAL NAME: BL LACERTAE, RADIO CONTINUUM: GALAXIES, TECHNIQUES: INTERFEROMETRIC
Abstract Copyright:
(c) 1998: The American Astronomical Society
DOI:
10.1086/305783
Bibliographic Code:
1998ApJ...500..810T

Abstract

We present maps of BL Lac obtained from geodetic VLBI data from the archive of the Washington correlator. The observations were made from 1996 March to 1996 November, with periods from one experiment to another as short as 1 month. The dominant structure of the maps is given by a superluminal component (C2) moving predominantly at position angle ~190 deg. At the later epochs a new superluminal component (C3) emerges from the core and moves along a trajectory at a higher position angle (200 deg). We also include maps from observations made in 1995 June and August showing the main component (C2) in the early stages of its evolution, as well as an older component (C1). The position angle of the component C1 is nearly the same as that of the new component C3. The component C2 shows indications of nonradial motion, which is discussed in terms of a helically distorted jet. The best fit was obtained for a half-opening angle of the jet of 2.dg6 and an angle of the helical axis to the line of sight of 17 deg.
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