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arxiv: 0711.3564 · v1 · submitted 2007-11-22 · 🌌 astro-ph

Phase-referencing on BL Lac

A.Sokolov , T.Cawthorne This is my paper
classification 🌌 astro-ph
keywords corephase-referencingpositionprecessionvariationsyearsabsoluteaimed
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We report the results of a phase-referencing study aimed at uncovering precession of the VLBI jet of BL Lac. The observations were conducted at 8, 15, 22, and 43 GHz and consist of seven epochs spanning about two years. We investigated the change in the absolute position of BL Lac's radio core by means of phase-referencing with two nearby sources, 2151+431 and 2207+374. The shift in the position of the core perpendicular to the jet is a signature of precession. However, the periodic variations with an amplitude of ~0.15 mas and a period of 1 year can be attributed to seasonal weather variations. We also detect a trend in position of the core on the scale of ~0.1 mas over two years.

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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Detections of nearly bias-free core shifts with 5-30 $\mu$as precisions at 8-43 GHz in BL Lacertae

    astro-ph.HE 2026-04 unverdicted novelty 4.0

    High-precision VLBI detects 250 μas core shift between 8.4 and 43.2 GHz in BL Lacertae, with fitted index k_r = 1.18 consistent with equipartition.