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Type: Artigo de periódico
Title: Observations of BL Lacertae from the geodetic VLBI archive of the Washington correlator
Author: Tateyama, CE
Kingham, KA
Kaufmann, P
Piner, BG
de Lucena, AMP
Botti, LCL
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 similar to 190 degrees. At the later epochs a new superluminal component (C3) emerges from the core and moves along a trajectory at a higher position angle (200 degrees). 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.degrees 6 and an angle of the helical axis to the line of sight of 17 degrees.
Subject: BL Lacertae objects, individual (BL Lacertae)
galaxies, jets
radio continuum, galaxies
techniques, interferometric
Country: EUA
Editor: Univ Chicago Press
Citation: Astrophysical Journal. Univ Chicago Press, v. 500, n. 2, n. 810, n. 815, 1998.
Rights: aberto
Identifier DOI: 10.1086/305783
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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