BL Lacertae

Detections of Nearly Bias-free Core Shifts with 5–30 μas Precisions at 8–43 GHz in BL Lacertae
Inverse phase-referencing VLBI astrometry measures nearly bias-free core shifts in BL Lacertae with 5–30 μas precision, providing constraints on opacity and physical conditions in the inner jet.
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Detections of Nearly Bias-free Core Shifts with 5–30 μas Precisions at 8–43 GHz in BL Lacertae