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Home All issues Volume 696 (April 2025) A&A, 696 (2025) A47 Full HTML
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Table A.2

22.2 GHz H2O maser parameters for NGC 7538 IRS1 from the global VLBI observations.

Feature Ipeak VLSR Δx Δy
Number (Jy beam−1) (km s−1) (mas) (mas)
1 28.345 −59.7 0.00 0.00
2 19.009 −59.6 0.45±0.09 −0.06±0.04
3 11.678 −59.8 −0.36±0.09 0.06±0.04
4 3.588 −58.1 −271.34±0.08 235.80±0.07
5 3.364 −58.1 −293.49±0.10 231.52±0.04
6 2.846 −54.2 −8.97±0.09 136.39±0.07
7 2.786 −60.0 19.07±0.07 0.54±0.04
8 2.115 −59.6 1.21±0.07 −0.17±0.04
9 2.010 −60.1 −25.74±0.08 5.46±0.04
10 1.463 −59.9 17.31±0.12 0.17±0.04
11 1.252 −60.1 33.68±0.11 4.34±0.04
12 1.102 −60.0 34.14±0.15 4.51±0.08
13 1.035 −54.9 −15.45±0.15 132.39±0.10
14 1.032 −58.1 −293.07±0.14 231.36±0.05
15 1.020 −55.0 −15.11±0.09 132.59±0.06
16 0.952 −54.6 −14.81±0.10 132.84±0.06
17 0.748 −64.6 −118.91±0.07 119.46±0.04
18 0.668 −55.0 −15.98±0.10 132.08±0.06
19 0.605 −60.1 15.75±0.08 −0.11±0.04
20 0.534 −55.0 −16.49±0.10 131.83±0.05
21 0.355 −60.2 15.43±0.10 −0.16±0.04
22 0.335 −61.8 −86.35±0.09 19.38±0.06
23 0.282 −62.2 −86.77±0.08 19.70±0.05
24 0.244 −55.2 −17.80±0.10 131.18±0.05
25 0.235 −55.4 −17.37±0.07 131.39±0.04
26 0.213 −58.3 −287.78±0.07 229.84±0.04
27 0.211 −58.0 −271.80±0.12 235.44±0.05
28 0.164 −47.9 68.21±0.07 163.89±0.03
29 0.148 −50.8 37.19±0.08 152.60±0.06
30 0.147 −60.2 20.43±0.07 0.83±0.04
31 0.146 −58.3 −172.85±0.07 92.14±0.04
32 0.144 −54.3 −8.54±0.08 136.70±0.04
33 0.142 −55.4 −18.46±0.08 130.73±0.04
34 0.138 −58.3 −287.02±0.07 229.75±0.04
35 0.134 −58.4 −173.12±0.07 91.83±0.04
36 0.093 −58.0 −270.92±0.08 235.85±0.11
37 0.087 −54.2 −9.97±0.10 135.59±0.08
38 0.074 −53.0 115.30±0.07 317.09±0.04
39 0.070 −48.6 65.77±0.07 163.51±0.04
40 0.062 −59.3 −166.85±0.08 97.62±0.06
41 0.056 −48.4 66.29±0.08 163.65±0.04
42 0.054 −59.1 1.68±0.07 −0.22±0.04
43 0.053 −55.3 −21.06±0.11 129.37±0.05
44 0.053 −60.4 16.75±0.07 0.11±0.04
45 0.052 −48.8 64.62±0.09 163.33±0.04
46 0.048 −55.6 −19.20±0.23 130.27±0.11
47 0.048 −48.2 67.66±0.07 163.75±0.04
48 0.039 −48.6 65.30±0.07 163.37±0.04
49 0.037 −60.7 47.19±0.13 10.17±0.09
50 0.036 −48.8 184.27±0.07 290.62±0.04
51 0.035 −49.2 63.64±0.09 163.11±0.04
52 0.030 −48.7 154.41±0.07 306.04±0.04
53 0.024 −62.7 −87.32±0.08 20.19±0.04
54 0.023 −60.8 47.78±0.07 257.47±0.04
55 0.023 −58.5 −308.17±0.09 242.06±0.07
56 0.015 −65.2 −122.22±0.07 121.42±0.04
57 0.015 −53.7 66.01±0.07 288.18±0.04
58 0.014 −47.7 68.59±0.07 164.05±0.04
59 0.013 −57.4 −273.91±0.07 239.51±0.04
60 0.012 −50.6 39.74±0.13 153.76±0.06
61 0.011 −48.2 66.87±0.08 163.70±0.04
62 0.011 −60.8 −89.37±0.07 71.59±0.05
63 0.010 −55.8 −81.13±0.08 84.69±0.05

Notes.

Column 1 gives the feature label number; Columns 2 and 3 provide the intensity of the strongest spot and the intensity-weighted VLSR, respectively; Columns 4 and 5 give the position offsets (with the associated errors) along the RA and DEC axes, relative to feature #1.

The absolute position of the feature #1 at the observing epoch on June 5, 2023, is: RA (J2000) = 23h 13m 45s 36302, DEC(J2000) = 61∘ 28′ 10′′.2730, with an accuracy of ±0.5 mas.

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