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Table A.1

Parameters of 6.7 GHz methanol maser cloudlets that appeared at all three epochs and were used for proper motion studies.

ΔRA ΔDec Vp Vfit FWHM Sp Sfit Lproj μRA μDec
(mas) (mas) (km s−1) (km s−1) (km s−1) (Jy beam−1) (Jy beam−1) (AU) (mas yr−1) (mas yr−1)
(km s−1) (km s−1)
Cloudlet 1
E1 −253.533 −152.352 73.70 0.057 1.6 −0.33 ± 0.05 −0.16 ± 0.03
E2 −256.310 −155.497 73.66 73.69 0.27 0.061 0.059 6.2 (−5.0 ± 0.8) (−2.4 ± 0.4)
E3 −257.195 −154.774 73.67 73.70 0.27 0.071 0.069 4.4
Cloudlet 2
E1 6.803 −173.999 77.03 0.123 6.3 −0.07 ± 0.03 −0.11 ± 0.01
E2 5.433 −176.891 77.00 77.04 0.29 0.066 0.070 8.4 (−1.1 ± 0.5) (−1.7 ± 0.2)
E3 6.598 −176.101 77.09 77.04 0.44 0.066 0.060 18.0
Cloudlet 3
E1 26.630 −141.485 77.56 77.57 0.34 1.152 1.129 20.5 0.12 ± 0.02 −0.18 ± 0.05
E2 26.888 −145.149 77.53 77.57 0.34 0.622 0.631 18.7 (1.8 ± 0.3) (−2.7 ± 0.7)
E3 26.845 −144.007 77.53 77.59 0.36 0.791 0.802 25.6
Cloudlet 4
E1 9.339 −145.446 77.56 77.51 0.25 0.452 0.481 9.6 −0.03 ± 0.01 −0.16 ± 0.01
E2 9.973 −148.564 77.44 0.220 11.6 (−0.5 ± 0.1) (−2.4 ± 0.1)
E3 10.024 −147.938 77.44 77.47 0.26 0.326 0.344 14.8
Cloudlet 5
E1 −39.464 −140.038 78.27 78.28 0.21 1.556 0.741 67.2 −0.14 ± 0.01 −0.10 ± 0.01
E1 78.32 0.68 0.848 (−2.1 ± 0.1) (−1.5 ± 0.1)
E2 −40.751 −142.033 78.32 78.03 0.50 1.445 0.772 16.2
E2 78.33 0.37 1.118
E3 −40.972 −141.999 78.32 77.99 0.44 2.643 0.897 18.0
E3 78.30 0.35 2.469
Cloudlet 6
E1 86.212 −83.371 78.88 78.90 0.44 0.515 0.460 23.2 0.11 ± 0.01 −0.14 ± 0.01
E2 86.009 −85.654 78.93 78.88 0.40 0.226 0.229 14.6 (1.6 ± 0.1) (−2.1 ± 0.1)
E3 87.093 −86.333 78.85 78.89 0.36 0.263 0.255 18.9
Cloudlet 7
E1 67.451 −84.341 79.41 79.39 0.27 0.996 0.780 19.6 0.01 ± 0.01 −0.04 ± 0.01
E1 79.70 0.51 0.612 (0.2 ± 0.2) (−0.6 ± 0.2)
E1 80.25 0.36 0.568
E2 65.743 −83.326 80.16 79.35 0.31 0.429 0.377 19.2
E2 79.69 0.41 0.308
E2 80.16 0.41 0.415
E3 65.861 −82.886 80.17 79.40 0.33 0.589 0.541 18.8
E3 79.71 0.29 0.332
E3 80.15 0.43 0.581
Cloudlet 8(1)
E1 152.045 −20.684 79.32 79.31 0.21 0.224 0.215 87.2
E1 134.537 −29.093 79.67 79.64 0.32 0.205 0.204 0.15 ± 0.05 −0.10 ± 0.01
E2 135.040 −31.685 79.63 0.103 10.3 (2.3 ± 0.7) (−1.5 ± 0.2)
E3 136.778 −31.472 79.64 79.60 0.38 0.108 0.111 13.3
Cloudlet 9
E1 −93.127 −124.285 80.02 80.01 0.23 2.406 2.437 8.7 −0.22 ± 0.01 0.01 ± 0.05
E2 −95.110 −125.658 79.98 80.00 0.30 1.379 1.355 4.9 (−3.3 ± 0.1) (0.1 ± 0.8)
E3 −95.544 −125.577 79.99 80.00 0.28 2.443 2.461 4.2
Cloudlet 10
E1 −7.721 −125.195 80.11 80.12 0.31 1.316 1.284 20.4 −0.08 ± 0.01 −0.05 ± 0.01
E2 −8.968 −128.111 80.07 80.09 0.38 0.708 0.695 18.7 (−1.2 ± 0.1) (−0.8 ± 0.1)
E3 −9.382 −127.429 80.08 80.12 0.42 0.668 0.661 20.9
Cloudlet 11
E1 50.535 −90.492 80.38 80.34 0.55 0.355 0.360 10.2 −0.04 ± 0.02 −0.03 ± 0.02
E1 80.71 0.24 0.256 (−0.7 ± 0.3) (−0.4 ± 0.2)
E2 49.989 −91.483 80.60 80.56 0.55 0.145 0.146 4.2
E3 49.811 −90.444 80.61 80.56 0.65 0.263 0.232 8.9
Cloudlet 12
E1 45.898 154.204 80.73 80.71 0.24 0.537 0.541 12.2 0.08 ± 0.03 0.26 ± 0.01
E2 47.109 155.542 80.60 80.64 0.23 0.202 0.217 4.8 (1.1 ± 0.5) (3.9 ± 0.1)
E3 46.225 155.697 80.69 80.68 0.25 0.192 0.195 6.4
Cloudlets 13 and 14(2)
E1 53.535 101.834 80.64 80.62 0.16 1.178 0.768 77.5 0.04 ± 0.01(a) 0.22 ± 0.03(a)
E1 55.143 93.753 80.81 80.78 0.63 0.513 0.08 ± 0.02(b) 0.08 ± 0.01(b)
E2 53.763 101.775 80.60 80.58 0.16 0.562 0.300 78.8 (0.6 ± 0.1)(a) (3.4 ± 0.5)(a)
E2 57.322 88.883 80.86 80.75 0.70 0.318 (1.2 ± 0.3)(b) (1.2 ± 0.1)(b)
E3 53.919 102.736 80.61 80.58 0.19 0.600 0.357 101.2
E3 57.125 90.007 80.87 80.82 0.67 0.345
Cloudlet 15
E1 −125.576 93.581 80.99 80.96 0.28 0.214 0.223 3.5 −0.03 ± 0.02 0.17 ± 0.05
E2 −125.793 92.900 80.86 80.90 0.32 0.187 0.190 5.3 (−0.5 ± 0.3) (2.5 ± 0.7)
E3 −126.072 94.390 80.96 80.92 0.29 0.193 0.204 2.9
Cloudlet 16
E1 −179.205 59.177 81.61 0.249 6.1 −0.05 ± 0.04 −0.24 ± 0.09
E2 −180.428 57.766 81.48 0.100 (-0.8 ± 0.6) (−3.7 ± 1.4)
E3 −180.471 57.523 81.57 0.093 1.8
Cloudlet 17
E1 38.705 91.985 81.52 81.04 0.37 0.764 0.161 33.9 0.11 ± 0.01 0.13 ± 0.01
E1 81.54 0.31 0.738 (1.7 ± 0.2) (2.0 ± 0.1)
E2 39.022 91.172 81.48 81.07 0.40 0.481 0.269 31.7
E2 81.51 0.30 0.480
E3 39.398 91.892 81.48 81.08 0.32 0.546 0.261 30.1
E3 81.51 0.33 0.555
Cloudlet 18
E1 41.846 77.244 81.87 81.86 0.27 1.153 1.149 32.4 0.11 ± 0.01 0.16 ± 0.01
E2 42.343 76.458 81.83 81.83 0.26 0.938 0.950 8.6 (1.6 ± 0.2) (2.4 ± 0.1)
E3 42.456 77.550 81.83 81.85 0.24 1.228 1.265 8.4
Cloudlet 19
E1 29.657 107.075 81.87 81.42 0.27 1.006 0.378 41.4 0.07 ± 0.05 0.02 ± 0.04
E1 81.88 0.37 1.011 (1.1 ± 0.8) (0.3 ± 0.6)
E1 82.10 0.12 0.561
E2 30.247 106.219 81.83 81.37 0.24 0.505 0.226 31.4
E2 81.84 0.46 0.496
E3 30.254 107.307 81.83 81.37 0.25 0.598 0.252 18.9
E3 81.86 0.46 0.629
Cloudlet 20
E1 72.954 −74.195 82.84 82.82 0.23 0.304 0.307 2.2 0.06 ± 0.01 0.15 ± 0.06
E2 73.199 −73.980 82.71 82.73 0.36 0.179 0.181 3.7 (0.9 ± 0.1) (2.2 ± 0.9)
E3 73.004 −73.894 82.80 82.76 0.28 0.194 0.206 3.5
Cloudlet 21
E1 76.096 −68.423 82.31 82.32 0.21 0.511 0.515 4.8 −0.02 ± 0.02 −0.07 ± 0.01
E2 75.413 −71.325 82.27 81.68 0.43 0.606 0.224 13.4 (−0.3 ± 0.3) (−1.0 ± 0.1)
E2 82.31 0.34 0.619
E3 75.269 −70.270 82.27 81.68 0.42 0.703 0.320 14.7
E3 82.30 0.36 0.700
Cloudlet 22
E1 −115.358 −105.101 82.40 82.37 0.24 0.709 0.727 4.1 −0.12 ± 0.01 −0.12 ± 0.01
E2 −116.431 −108.533 82.36 82.33 0.23 0.432 0.449 6.0 (−1.9 ± 0.1) (−1.8 ± 0.1)
E3 −116.699 −107.896 82.36 82.34 0.27 0.683 0.696 29.1
Cloudlet 23
E1 31.639 88.650 82.57 82.51 0.25 4.619 2.665 38.3 0.07 ± 0.02 0.05 ± 0.01
E1 82.62 0.61 2.359 (1.1 ± 0.3) (0.8 ± 0.2)
E2 31.752 86.848 82.53 82.50 0.57 2.152 1.637 37.5
E2 82.57 0.14 0.642
E2 82.84 0.21 0.632
E3 32.219 89.523 82.45 82.46 0.37 3.699 3.641 34.0
E3 82.83 0.27 1.381
Cloudlet 24
E1 −179.404 76.999 83.10 83.14 0.22 0.293 0.310 4.0 −0.17 ± 0.06 0.11 ± 0.04
E2 −181.984 76.686 83.15 0.288 2.6 (−2.6 ± 0.9) (1.7 ± 0.7)
E3 −181.533 77.319 83.15 83.13 0.31 0.371 0.374 4.7
Cloudlets 25 and 26(3)
E1 −16.208 123.792 83.28 83.25 0.30 1.519 1.577 35.9 0.06 ± 0.02(a) 0.07 ± 0.01(a)
E1 −21.252 120.618 83.98 83.97 0.59 0.844 0.799 0.00 ± 0.01(b) 0.15 ± 0.02(b)
E2 −15.348 122.310 83.15 83.18 0.29 1.376 1.363 37.6 (0.9 ± 0.2)(a) (1.1 ± 0.1)(a)
E2 −21.334 119.999 83.94 83.93 0.73 0.591 0.554 (0.0 ± 0.1)(b) (2.3 ± 0.3)
E3 −15.293 122.870 83.15 83.18 0.26 2.160 2.151 34.8
E3 −21.352 121.319 83.94 83.91 0.72 0.691 0.674
Cloudlet 27
E1 −102.322 92.561 84.24 84.21 0.27 0.550 0.572 9.8 −0.04 ± 0.03 0.13 ± 0.03
E2 −102.881 91.324 84.20 84.19 0.34 0.441 0.442 9.9 (−0.6 ± 0.4) (2.0 ± 0.5)
E3 −102.858 92.632 84.20 84.19 0.31 0.592 0.587 18.2
Cloudlet 28
E1 75.805 −42.352 84.33 84.31 0.23 0.107 0.110 4.3 0.03 ± 0.03 −0.35 ± 0.02
E2 76.201 −47.031 84.29 84.27 0.24 0.127 0.128 2.1 (0.5 ± 0.5) (−5.3 ± 0.3)
E3 76.554 −46.609 84.29 84.30 0.23 0.138 0.138 2.4
Cloudlet 29
E1 77.392 −51.483 84.86 84.83 0.42 0.838 0.848 25.1 0.03 ± 0.02 −0.03 ± 0.01
E2 77.077 −52.809 84.73 84.77 0.38 0.586 0.563 12.0 (0.4 ± 0.3) (−0.5 ± 0.1)
E3 77.121 −51.754 84.73 84.78 0.39 0.656 0.610 25.4
Cloudlet 30
E1 93.386 −3.914 84.95 84.69 0.28 0.395 0.242 43.5 0.04 ± 0.05 −0.12 ± 0.05
E1 84.93 0.12 0.400 (0.5 ± 0.8) (−1.8 ± 0.8)
E2 90.422 0.116 84.73 84.71 0.33 0.379 0.368 10.7
E3 90.266 1.301 84.73 84.71 0.32 0.418 0.401 20.4
Cloudlet 31
E1 92.768 −6.569 85.56 84.84 0.91 0.821 0.351 20.7 +0.12 ± 0.01 −0.08 ± 0.01
E1 85.18 0.24 0.379 (1.8 ± 0.1) (−1.2 ± 0.1)
E1 85.52 0.30 0.733
E1 85.94 0.40 0.437
E1 86.47 0.58 0.253
E2 97.019 −11.151 84.73 85.14 0.24 0.967 0.618 23.6
E2 84.74 0.51 0.921
E2 85.56 0.41 0.710
E2 85.97 0.33 0.532
E2 86.51 0.62 0.211
E3 97.693 −10.776 84.73 84.74 0.47 1.268 1.220 26.8
E3 85.15 0.26 0.982
E3 85.57 0.39 0.932
E3 85.97 0.35 0.656
E3 86.45 0.41 0.381
Cloudlet 32
E1 13.707 103.628 86.26 86.29 0.15 1.174 0.500 42.4 0.08 ± 0.01 0.08 ± 0.01
E1 86.23 0.72 0.736 (1.2 ± 0.1) (1.2 ± 0.1)
E1 86.79 0.28 0.955
E2 13.988 102.790 86.31 85.98 0.29 0.844 0.428 32.0
E2 86.31 0.33 0.811
E2 86.71 0.34 0.613
E3 14.168 103.850 86.31 86.10 0.57 1.060 0.577 22.1
E3 86.35 0.25 0.663
E3 86.70 0.35 0.767
Cloudlet 33
E1 −60.445 122.938 86.61 86.66 0.38 0.168 0.171 7.5 −0.12 ± 0.03 0.16 ± 0.01
E2 −60.806 122.658 86.75 86.72 0.36 0.180 0.181 12.9 (−1.8 ± 0.4) (2.5 ± 0.1)
E3 −61.147 123.733 86.75 86.76 0.31 0.242 0.239 14.7
Cloudlet 34
E1 11.305 117.839 87.67 87.64 0.25 0.433 0.428 11.5 0.11 ± 0.03 0.12 ± 0.01
E2 11.709 117.754 87.62 87.65 0.33 0.152 0.150 7.8 (1.7 ± 0.4) (1.8 ± 0.1)
E3 11.855 118.634 87.72 87.66 0.33 0.220 0.213 15.8

Notes. (a) and (b) denote which values correspond to each other. Coordinates (ΔRA, ΔDec) arerelative to the motion centre as in Fig. 1. If possible, Gaussian velocity profiles are characterised by the velocity (Vfit), full width at half maximum (FWHM), and flux density (Sfit) of the maser cloudlet. The relative proper motion of cloudlets estimated by linear fitting are also listed (μRA, μDec). (1) Weaker Gaussian feature was used for proper motions. (2)Both Gaussian features were used for proper motions. (3)Both Gaussian features were used for proper motions.

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