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Table A.1.

Parameters of the ALMA observations

Observation date Frequencya Flux & Bandpass calibrator Phase calibrator Bandwidthb rmsc Beam
(YYYY-MM-DD) (GHz) (name, Jy) (name, mJy) (GHz) (μJy beam−1) (mas×mas,degree)c
Project code: 2017.1.00017.S
2018-09-28 257.049 J1924-2914, 2.977 J1743-1658, 142.5±0.8 1.86 130 268×218, 69.7
258.911 2.963 142.2±0.8 0.91 130 264×214, 69.6
272.041 2.868 138.6±0.8 0.82 160 252×204, 68.8
273.904 2.855 139.1±0.7 1.64 160 251×204, 68.6
Project code: 2018.1.00088.S
2019-05-01 212.043 J1924-2914, 2.746 J1743-1658, 143.4±0.9 1.52 31 515×454, −79.9
214.933 2.723 142.8±1.0 1.86 30 514×452, −81.1
227.357 2.634 139.6±1.0 0.89 37 487×431, −81.4
230.038 2.616 138.6±1.0 0.86 40 482×425, −81.4
2019-03-31[2019-04-11]d 220.945 J1924-2914[J1517-2422], 2.900[2.453] J1743-1658, 157.0±0.8[145.0±0.5] 1.16 48 792×571, −88.1
223.944 J1924-2914[J1517-2422], 2.875[2.443] 155.9±0.8[144.3±0.5] 1.85 41 780×560, −88.5
236.454 J1924-2914[J1517-2422], 2.776[2.402] 151.9±0.9[140.0±0.6] 1.21 54 745×533, −88.9
238.941 J1924-2914[J1517-2422], 2.757[2.394] 151.2±0.7[139.5±0.6] 1.85 52 735×531, −88.9
2019-04-30[2019-05-01]e 250.982 J1924-2914, 2.483 J1743-1658, 130.8±0.9[126.4±0.9] 1.25 57 492×403, 89.2
252.850 2.472 130.2±0.9[126.5±1.0] 1.41 57 486×400, 88.9
265.808 2.400 126.9±0.7[123.7±1.0] 1.08 70 472×412, −66.9
267.677 2.390 126.4±0.7[122.9±0.7] 1.19 71 458×381, 89.8
2019-06-22 224.000 J1924-2914, 2.913 J1743-1658, 157.0±1.0 1.75 73 25×24, 48.2
226.000 2.898 156.1±0.6 1.48 73 24×23, −82.8
240.000 2.795 152.6±0.8 1.75 77 23×22, −89.4
242.000 2.782 151.8±0.7 1.75 84 23×21, −87.2
Project code: 2018.1.00341.S
2019-04-21 343.009 J1924-2914, 2.051 J1742-1517, 149.2±0.4 1.37 240 335×303, 77.3
344.967 2.044 148.7±0.4 0.79 260 336×309, 72.0
355.009 2.008 147.8±0.5 0.76 290 326×298, 73.8
356.897 2.002 147.1±0.5 1.36 280 323×293, 76.8
a

Central frequency of the spectral window.

b

Effective bandwidth of the spectral window used to produce the continuum images.

c

rms noise over the effective bandwidth used to produce the continuum images.

d

mas=milliarcsec.

e

Data taken at two different dates were used to produce the continuum images.

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