Fig. 3
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Comparison of GLOSTAR astrometry with CORNISH and VLBI results. Top panel: offsets between GLOSTAR B-configuration positions (this work) and the positions of VLBI calibrators (black crosses, red filled ellipse) for 44 counterparts, and the offsets between CORNISH and VLBI calibrators for 75 counterparts (blue crosses, green filled ellipse). The VLBI calibrators have a (sub)milliarcsec positional accuracy (Petrov 2021). The median and standard deviation of the offsets are −0″.06 and −0″.11, suggesting a systematic positional difference of ≲0″.1 for the GLOSTAR and Very Long Baseline Array (VLBA) calibrators. Bottom panel: position offsets between the GLOSTAR B-configuration and CORNISH positions for 669 counterparts. The mean and standard deviation of the offsets are 0″.08 and 0″.16, suggesting a systematic positional difference of ≲0″.1 for the GLOSTAR and CORNISH.
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