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Table 3.
Sgr A∗: size of elliptical Gaussian fits to observed 86 GHz emission.
| Reference | Major axis | Minor axis | Position angle | Axial ratio | Calculated intrinsic size |
|---|---|---|---|---|---|
| ( μas) | ( μas) | (°) | (–) | ( μas) | |
| Ortiz-León et al. (2016; obs. 1, self-cal.) | 212.7 ± 2.3 | 138.5 ± 3.5 | 81.1 ± 1.8 | 1.54 ± 0.04 | 142 ± 9 × 114 ± 15 |
| Ortiz-León et al. (2016; obs. 2, self-cal.) | 221.7 ± 3.6 | 145.6 ± 4.0 | 75.2 ± 2.5 | 1.52 ± 0.05 | 155 ± 9 × 122 ± 14 |
| Lu et al. (2011a; self-cal) | 210 ± 10 | 130 ± 10 | 83.2 ± 1.5 | 1.62 | 139 ± 17 × 102 ± 21 |
| (Shen et al. 2005; clos. ampl.) |  |
 |
 |
1.62 | |
| (Doeleman et al. 2001; self-cal., averaged) | 180 ± 20 | – | – | – | |
| (Krichbaum et al. 1998; modelfit) | 190 ± 30 | – | – | – | |
| This work (self-cal) | 217 ± 22 | 165 ± 17 | 77 ± 15 | 1.3 | 167 ± 22 × 122 ± 25a |
| This work (clos. ampl., full array) | 215.1 ± 0.4 | 145.1 ± 1.5 | 77.9 ± 0.4 | 1.48 ± 0.01 | 145.4 ± 0.6 × 122.6 ± 1.7 |
| This work (clos. ampl., no GBT) | 213.9 ± 2.5 | 148.0 ± 4.0 | 77.9 ± 3.0 | 1.45 ± 0.03 | 144.4 ± 3.7 × 125.2 ± 4.9 |
| This work (clos. ampl., no LMT) | 210.6 ± 1.0 | 88.7 ± 34.2 | 86.4 ± 1.2 | 2.37 ± 1.02 | 86.5 ± 69.7 × 40.6 ± 40.5 |
Notes.
(a)
Calculated using a scattering kernel size of 158.5 × 77.5 μas at 86 GHz, from Bower et al. (2006). No uncertainty in scattering kernel size was incorporated in this calculation. Our closure amplitude results below use the same scattering kernel.
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