Table 1
Observational details.
| Source | Observation | Calibrator | Polarization | Beam size | Position | rms | σs.−n. (b) | Estimated absolute position using FRMAP | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| name (a) | date | angle | angle | α2000 | δ2000 | Δα (c) | Δδ (c) | ||||
| (°) | (mas × mas) | (°) | ( ) |
( ) |
(h : m : s) | (° : ′ : ″) | (mas) | (mas) | |||
| G30.70-0.07 | 16 October 2014 | J2202+4216 (d) | + 1 ± 1 | 8.5 × 4.2 | −40.93 | 2 | 25 | +18:47:36.900 | −02:01:05.025 | 0.4 | 13.1 |
| G30.76-0.05 | 17 October 2014 | J2202+4216 (e) | + 1 ± 1 | 8.5 × 3.9 | −36.28 | 5 | 29 | +18:47:39.732 | −01:57:21.975 | 0.3 | 10.2 |
| G31.28+0.06 | 20 October 2015 | J2202+4216 (f) | − 15 ± 3 | 5.3 × 4.4 | −66.03 | 3 | 60 | +18:48:12.390 | −01:26:22.629 | 0.8 | 37.4 |
| G32.03+0.06 | 21 October 2015 | J2202+4216 (g) | − 16 ± 5 | 5.1 × 4.4 | −76.73 | 3 | 40 | +18:49:36.580 | −00:45:46.891 | 0.2 | 17.5 |
| G69.52-0.97 | 22 October 2015 | J2202+4216 (h) | − 27 ± 4 | 5.9 × 3.1 | −67.04 | 2 | 28 | +20:10:09.0699 | +31:31:34.399 | 0.7 | 1.8 |
Notes. (a)Source name provided in Galactic coordinates. (b)Self-noise in the maseremission channels (e.g., Sault 2012). When more than one maser feature shows circularly polarized emission, we present the self-noise of the weakest feature. When no circularly polarized emission is detected, we consider the self-noise of the brightest maser feature. (c)Formal errors of the fringe-rate mapping. (d)Calibrated using results from G30.76-0.05.(e)Calibrated using 3C286 (I = 1.26 Jy beam−1, Pl = 6.5%). (f) Calibrated using 3C286 (I = 0.60 Jy beam−1, Pl = 7.7%). (g) Calibrated using 3C286 (I = 0.73 Jy beam−1, Pl = 9.0%). (h) Calibrated using 3C286 (I = 0.65 Jy beam−1, Pl = 9.2%).
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