Table A.1
22.2 GHz H2O maser parameters for NGC 7538 IRS1 from the VLBA observations.
| Feature | Epochsa of | Ipeak | VLSR | Δx | Δ y | Vx | Vy |
|---|---|---|---|---|---|---|---|
| Number | Detection | (Jy beam−1) | (km s−1) | (mas) | (mas) | (km s−1) | (km s−1) |
| 1 | 1,2,3,4 | 34.365 | −59.8 | 0.00 | 0.00 | −6.7±7.7 | −4.5±3.3 |
| 2 | 1,2,3,4 | 8.297 | −68.1 | 58.68±0.18 | 265.25±0.09 | −17.5±3.2 | −2.6±3.7 |
| 3 | 1,2,3,4 | 5.114 | −44.8 | 126.55±0.18 | 256.04±0.08 | 1.8±3.1 | 8.4±3.5 |
| 4 | 1,2,3,4 | 2.181 | −60.0 | −23.48±0.19 | 3.85±0.08 | 8.7±5.5 | −4.4±3.3 |
| 5 | 1,2,3,4 | 1.975 | −58.5 | −155.99±0.19 | 101.29±0.10 | −7.7±3.6 | 12.3±3.8 |
| 6 | 1,2,3,4 | 1.774 | −59.9 | 14.38±0.21 | 0.75±0.07 | 11.6±5.7 | −3.4±3.0 |
| 7 | 1 | 1.522 | −57.3 | 85.87±0.18 | 290.30±0.08 | .... | .... |
| 8 | 1,2,3,4 | 1.434 | −58.0 | −273.93±0.19 | 238.08±0.08 | 10.3±3.8 | −3.1±3.4 |
| 9 | 1,2,3,4 | 1.336 | −54.8 | −7.84±0.23 | 130.22±0.16 | 4.8±7.1 | 12.8±7.0 |
| 10 | 1,2,3,4 | 1.329 | −58.3 | 78.18±0.18 | 48.68±0.08 | 5.1±3.2 | −7.1±3.2 |
| 11 | 1,2,3,4 | 1.220 | −58.4 | −294.56±0.19 | 234.78±0.08 | −2.6±3.8 | −9.5±3.0 |
| 12 | 1,2,3,4 | 1.132 | −54.7 | −8.87±0.23 | 129.59±0.17 | 7.6±6.6 | 15.5±6.5 |
| 13 | 1,2,3,4 | 0.832 | −61.4 | −116.87±0.20 | 99.38±0.10 | −4.8±4.8 | −1.6±4.3 |
| 14 | 1,2,3,4 | 0.726 | −45.0 | 117.47±0.18 | 244.67±0.08 | 5.0±3.3 | 8.4±3.3 |
| 15 | 4 | 0.629 | −68.0 | 57.87±0.16 | 265.25±0.10 | .... | .... |
| 16 | 2 | 0.573 | −47.8 | 71.21±0.16 | 160.97±0.07 | .... | .... |
| 17 | 1,2,3,4 | 0.567 | −58.0 | −275.15±0.18 | 237.21±0.07 | 18.5±3.2 | 0.8±3.1 |
| 18 | 1,3,4 | 0.560 | −47.8 | 70.44±0.20 | 160.74±0.08 | 13.3±4.4 | 6.2±3.3 |
| 19 | 1,2,3,4 | 0.553 | −58.1 | −308.01±0.18 | 242.56±0.09 | −8.2±3.4 | −0.7±3.8 |
| 20 | 1,2,3,4 | 0.504 | −58.3 | −156.39±0.19 | 100.59±0.21 | −9.6±3.8 | 20.4±7.2 |
| 21 | 1,2,3 | 0.478 | −60.1 | −6.33±0.18 | 1.69±0.08 | −2.8±5.6 | −3.5±4.6 |
| 22 | 1,2,3 | 0.436 | −52.9 | 111.75±0.18 | 246.21±0.07 | 16.0±4.4 | −3.5±4.3 |
| 23 | 1,3 | 0.424 | −60.1 | −24.60±0.19 | 4.16±0.08 | .... | .... |
| 24 | 1,2,3,4 | 0.398 | −60.5 | 42.14±0.20 | 9.34±0.10 | 1.7±5.2 | −7.7±4.2 |
| 25 | 1,3 | 0.369 | −47.8 | 71.28±0.24 | 160.82±0.08 | .... | .... |
| 26 | 1,2,3,4 | 0.348 | −60.2 | −7.58±0.24 | 2.09±0.10 | −7.8±7.9 | −2.0±4.4 |
| 27 | 1,2,3,4 | 0.313 | −70.2 | 59.65±0.20 | 259.02±0.21 | −13.0±4.3 | −10.4±6.7 |
| 28 | 1,2,3,4 | 0.273 | −58.1 | −306.73±0.19 | 241.71±0.08 | −0.8±4.2 | −9.4±3.8 |
| 29 | 1,2,3,4 | 0.246 | −64.2 | 57.82±0.18 | 266.09±0.08 | −2.7±4.0 | 0.5±3.5 |
| 30 | 1,2,3,4 | 0.244 | −49.2 | 64.24±0.19 | 159.73±0.08 | 4.6±3.6 | 4.5±3.2 |
| 31 | 4 | 0.240 | −44.7 | 126.32±0.16 | 256.34±0.13 | .... | .... |
| 32 | 1 | 0.239 | −57.9 | −272.70±0.18 | 238.90±0.08 | .... | .... |
| 33 | 1 | 0.233 | −44.2 | 103.95±0.18 | 295.47±0.08 | .... | .... |
| 34 | 3 | 0.202 | −44.8 | 126.87±0.17 | 257.15±0.08 | .... | .... |
| 35 | 2,3 | 0.182 | −72.4 | 57.78±0.15 | 266.88±0.08 | .... | .... |
| 36 | 1 | 0.156 | −72.3 | 58.88±0.19 | 263.14±0.09 | .... | .... |
| 37 | 1 | 0.130 | −62.6 | 58.04±0.19 | 266.20±0.09 | .... | .... |
| 38 | 1 | 0.119 | −48.2 | 69.26±0.18 | 160.61±0.08 | .... | .... |
| 39 | 2 | 0.100 | −62.1 | 57.33±0.17 | 266.63±0.09 | .... | .... |
| 40 | 1,2,3,4 | 0.099 | −61.3 | −117.63±0.20 | 99.95±0.08 | −7.0±4.7 | −1.5±3.4 |
| 41 | 1 | 0.097 | −62.7 | −90.12±0.19 | 2.59±0.09 | .... | .... |
| 42 | 1 | 0.067 | −70.8 | 58.46±0.19 | 261.42±0.11 | .... | .... |
| 43 | 2,3 | 0.059 | −51.0 | 36.51±0.20 | 147.29±0.12 | .... | .... |
| 44 | 2 | 0.046 | −61.2 | −73.79±0.24 | 1.84±0.14 | .... | .... |
Notes.
(a) The VLBA epochs are: 1) March 2, 2017; 2) May 27, 2017; 3) June 11, 2017; 4) July 22, 2017.
Column 1 gives the feature label number; Column 2 lists the observing epochs at which the feature was detected; Columns 3 and 4 provide the intensity of the strongest spot and the intensity-weighted VLSR, respectively, averaged over the observing epochs; Columns 5 and 6 give the position offsets (with the associated errors) along the RA and DEC axes, relative to feature #1, measured at the first epoch of detection; Columns 7 and 8 give the components of the absolute proper motion (with the associated errors) along the RA and DEC axes.
The absolute position of the feature #1 at the first observing epoch on March 2, 2017, is: RA (J2000) = 23h 13m 45s.36587, DEC (J2000) = 61∘ 28′ 10′′.2888, with an accuracy of ±0.5 mas.
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