Open Access
Table I.1.
ALMA 2017 Sgr A* light curves, in total flux, polarized intensity, and Stokes V.
| Day | UT | Duration | Parameter | Spectral Window | Samples | Flux (Jy) | Modulation | max-min | |
|---|---|---|---|---|---|---|---|---|---|
| (2017) | (h) | (h) | label | Frequency (GHz) | (Jy) | ||||
| April 6 | 8:24 - 14:33 | 6.15 | Stokes I | B1 | 212.1 − 214.1 | 2324 | 2.88 ± 0.13 | 0.044 | 0.41 |
| B2 | 214.1 − 216.1 | 2331 | 2.87 ± 0.12 | 0.043 | 0.41 | ||||
| B3 | 226.1 − 228.1 | 2319 | 2.89 ± 0.13 | 0.044 | 0.48 | ||||
| B4 | 228.1 − 230.1 | 2329 | 2.89 ± 0.13 | 0.044 | 0.42 | ||||
| P | B1 | 212.1 − 214.1 | 2324 | 0.22 ± 0.06 | 0.27 | 0.22 | |||
| B2 | 214.1 − 216.1 | 2331 | 0.22 ± 0.06 | 0.27 | 0.22 | ||||
| B3 | 226.1 − 228.1 | 2319 | 0.22 ± 0.05 | 0.25 | 0.21 | ||||
| B4 | 228.1 − 230.1 | 2329 | 0.23 ± 0.06 | 0.25 | 0.22 | ||||
| Stokes V | B1 | 212.1 − 214.1 | 2324 | −0.037 ± 0.015 | 0.41 | 0.055 | |||
| B2 | 214.1 − 216.1 | 2331 | −0.037 ± 0.015 | 0.40 | 0.056 | ||||
| B3 | 226.1 − 228.1 | 2319 | −0.037 ± 0.016 | 0.42 | 0.058 | ||||
| B4 | 228.1 − 230.1 | 2329 | −0.040 ± 0.015 | 0.38 | 0.053 | ||||
| April 7 | 4:02 - 14:25 | 10.37 | Stokes I | B1 | 212.1 − 214.1 | 3771 | 2.61 ± 0.18 | 0.069 | 0.73 |
| B2 | 214.1 − 216.1 | 3765 | 2.61 ± 0.18 | 0.068 | 0.73 | ||||
| B3 | 226.1 − 228.1 | 3721 | 2.61 ± 0.18 | 0.069 | 0.71 | ||||
| B4 | 228.1 − 230.1 | 3727 | 2.62 ± 0.19 | 0.071 | 0.75 | ||||
| P | B1 | 212.1 − 214.1 | 3771 | 0.18 ± 0.06 | 0.31 | 0.27 | |||
| B2 | 214.1 − 216.1 | 3765 | 0.18 ± 0.06 | 0.31 | 0.27 | ||||
| B3 | 226.1 − 228.1 | 3721 | 0.19 ± 0.06 | 0.31 | 0.28 | ||||
| B4 | 228.1 − 230.1 | 3727 | 0.20 ± 0.06 | 0.33 | 0.29 | ||||
| Stokes V | B1 | 212.1 − 214.1 | 3771 | −0.030 ± 0.013 | 0.43 | 0.058 | |||
| B2 | 214.1 − 216.1 | 3765 | −0.030 ± 0.013 | 0.43 | 0.060 | ||||
| B3 | 226.1 − 228.1 | 3721 | −0.029 ± 0.012 | 0.41 | 0.056 | ||||
| B4 | 228.1 − 230.1 | 3727 | −0.030 ± 0.012 | 0.41 | 0.059 | ||||
| April 11 | 9:00 - 14:03 | 2.82 | Stokes I | B1 | 212.1 − 214.1 | 1378 | 2.73 ± 0.33 | 0.119 | 1.15 |
| B2 | 214.1 − 216.1 | 1377 | 2.72 ± 0.33 | 0.121 | 1.16 | ||||
| B3 | 226.1 − 228.1 | 1370 | 2.69 ± 0.34 | 0.125 | 1.20 | ||||
| B4 | 228.1 − 230.1 | 1362 | 2.69 ± 0.34 | 0.125 | 1.19 | ||||
| P | B1 | 212.1 − 214.1 | 1378 | 0.21 ± 0.05 | 0.26 | 0.23 | |||
| B2 | 214.1 − 216.1 | 1377 | 0.21 ± 0.05 | 0.26 | 0.23 | ||||
| B3 | 226.1 − 228.1 | 1370 | 0.21 ± 0.06 | 0.26 | 0.24 | ||||
| B4 | 228.1 − 230.1 | 1362 | 0.22 ± 0.06 | 0.27 | 0.25 | ||||
| Stokes V | B1 | 212.1 − 214.1 | 1378 | −0.033 ± 0.007 | 0.20 | 0.032 | |||
| B2 | 214.1 − 216.1 | 1377 | −0.030 ± 0.007 | 0.23 | 0.031 | ||||
| B3 | 226.1 − 228.1 | 1370 | −0.028 ± 0.006 | 0.23 | 0.029 | ||||
| B4 | 228.1 − 230.1 | 1362 | −0.027 ± 0.007 | 0.25 | 0.030 | ||||
Notes. Stokes V reported values are tentative, as the detected levels fall below ALMA’s guaranteed CP accuracy.
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