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Table 1

Results of astrometry and model fitting of M 81*. In the cases when it was not possible to perform a reliable astrometry (due to poor uv-coverage, too noisy data, or both), we added “–”.

Epoch Δα1 Δδ1 σ 1 Peak2 PA2 Major2 Minor2
(dd/mm/yy) (mas) (mas) (mas) (mJy beam-1) (deg) (mas) (mas)
1.7 GHz
06/11/93 – – – 0.086 −47.0 1.552 0.637
17/12/93 – – – 0.055 42.0 4.293 0.0
15/03/94 – – – 0.05 23.7 4.225 0.0
30/11/98 0.663 −0.052 0.09 0.106 58.9 2.324 0.842
06/06/99 0.786 −0.054 0.09 0.118 59.5 2.178 0.919
28/09/99 0.598 0.050 0.09 0.116 61.3 2.363 1.139
20/11/00 0.440 0.030 0.10 0.115 63.5 2.311 0.858
26/11/01 0.741 −0.07 0.11 0.073 65.3 2.375 1.306
17/11/02 0.276 −0.116 0.12 0.085 73.6 2.115 1.079
06/06/04 0.866 −0.105 0.14 0.079 71.1 2.085 0.990
06/11/05 0.975 −0.045 0.15 0.080 64.5 2.162 0.712
2.3 GHz
19/12/95 – – – 0.092 50.4 1.512 0.0
13/12/96 0.448 0.239 0.050 0.103 62.7 1.026 0.526
15/11/97 0.408 0.214 0.050 0.098 55.6 1.913 0.211
07/12/98 – – – – – – –
13/11/00 0.47 −0.155 0.080 0.095 66.3 1.927 0.797
5.0 GHz
06/11/93 – – – 0.101 26.0 0.787 0.0
17/12/93 – – – 0.080 78.3 5.224 0.0
28/01/94 – – – 0.087 75.1 1.541 0.0
15/03/94 – – – 0.065 11.8 0.021 0.0
22/04/94 – – – 0.086 45.8 1.148 0.0
22/06/94 – – – 0.095 −34.0 0.873 0.165
30/08/94 – – – 0.060 73.2 2.089 0.0
31/10/94 – – – 0.093 26.7 0.582 0.0
23/12/94 – – – 0.082 10.7 0.472 0.0
11/05/95 – – – 0.095 26.0 0.41 0.133
18/08/95 0.122 0.123 0.023 0.101 44.9 0.717 0.0
19/12/95 0.126 0.047 0.025 0.100 41.1 0.499 0.140
28/03/96 0.128 −0.016 0.03 0.110 67.1 0.759 0.271
08/04/96 0.128 −0.022 0.03 0.106 61.1 0.607 0.220
17/06/96 0.088 −0.011 0.03 0.104 60.6 0.799 0.242
01/09/96 0.045 0.001 0.03 0.116 56.6 0.901 0.245
22/10/96 0.148 0.181 0.03 0.096 46.6 0.912 0.357
13/12/96 0.161 0.073 0.03 0.136 55.5 1.215 0.226
25/02/97 0.138 0.006 0.03 0.105 60.6 1.321 0.669
07/06/97 0.068 0.021 0.03 0.113 59.7 0.855 0.291
15/11/97 −0.054 −0.103 0.04 0.105 58.0 0.829 0.338
18/02/98 0.125 0.002 0.04 0.123 58.3 0.866 0.191
30/05/98 0.012 0.006 0.04 0.191 57.0 0.827 0.264
03/06/98 0.009 0.017 0.04 0.154 58.3 0.841 0.334
20/11/98 0.151 0.032 0.04 0.224 55.7 1.084 0.28
23/11/98 0.167 0.085 0.04 0.229 55.3 1.08 0.264
10/06/99 0.041 −0.084 0.05 0.144 63.5 0.934 0.368
16/06/99 0.090 −0.400 0.05 0.145 66.7 0.891 0.408
22/09/99 0.138 −0.05 0.05 0.202 69.9 0.903 0.386
24/11/99 0.249 0.014 0.05 0.185 67.8 1.043 0.345
06/06/00 0.061 −0.140 0.05 0.169 64.1 1.128 0.387
24/11/00 0.085 −0.158 0.05 0.133 69.3 1.034 0.326
14/02/01 0.167 −0.127 0.06 0.106 72.1 0.805 0.419
10/06/01 0.118 −0.135 0.06 0.121 74.8 0.754 0.345
18/11/01 0.207 −0.124 0.06 0.097 72.0 0.867 0.322
24/05/22 0.153 −0.185 0.06 0.123 72.3 0.947 0.229
01/06/03 0.463 −0.356 0.07 0.121 63.7 0.911 0.280
29/03/03 −0.203 −0.180 0.07 0.068 66.5 1.102 0.263
25/05/04 −0.103 −0.149 0.07 0.098 60.7 0.735 0.276
31/10/04 −0.046 −0.449 0.07 0.105 60.4 0.912 0.247
11/06/05 −0.498 0.337 0.08 0.111 61.1 1.212 0.263
22/10/05 −0.298 −0.195 0.08 0.107 65.4 0.845 0.338
04/08/93 – – – 0.101 −71.2 1.233 0.655
19/09/93 – – – 0.069 −6.9 0.291 0.0
8.4 GHz
06/11/93 – – – 0.022 52.0 0.337 0.245
28/01/94 – – – 0.050 37.1 0.799 0.0
15/03/94 – – – 0.095 39.0 0.326 0.103
22/06/94 – – – 0.098 51.2 0.395 0.142
12/02/95 −0.067 −0.075 0.02 0.110 56.2 0.341 0.185
11/05/95 −0.038 −0.119 0.03 0.101 49.3 0.439 0.056
18/08/95 −0.052 0.117 0.03 0.098 48.8 0.321 0.0
19/12/95 −0.194 −0.188 0.03 0.116 51.7 0.576 0.224
08/04/96 −0.039 −0.061 0.03 0.110 53.7 0.55 0.126
01/09/96 −0.137 −0.074 0.04 0.112 53.5 0.415 0.110
13/12/96 −0.176 −0.118 0.04 0.133 32.2 0.416 0.301
07/06/97 −0.120 −0.058 0.04 0.109 51.2 0.435 0.147
15/11/97 −0.113 −0.069 0.05 0.158 54.7 0.464 0.146
03/06/98 −0.035 −0.016 0.05 0.205 56.6 0.665 0.179
25/02/00 0.078 −0.154 0.06 0.193 63.3 0.791 0.247
13/11/00 −0.017 −0.016 0.06 0.146 66.7 0.54 0.223

Notes. 

(1)

Δα and Δδ are the right ascension and declination (respectively) of the intensity peak referred to the coordinates given in Sect. 4.2. σ is the uncertainty in both, Δα and Δδ.

(2)

Peak, PA, Major, and Minor are the intensity peak, position angle, major axis, and minor axis (respectively) of Gaussians fitted to the M 81* visibilities.

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