REVIEW 1 cited by
Phase-referencing on BL Lac
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
Phase-referencing on BL Lac
read the original abstract
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.
Forward citations
Cited by 1 Pith paper
-
Detections of nearly bias-free core shifts with 5-30 $\mu$as precisions at 8-43 GHz in BL Lacertae
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.
discussion (0)
Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.