Table 2.
Flux densities, core sizes, and core brightness temperatures at 230 GHz measured during the 2017 EHT observing campaign.
| Source | Flux Density (mJy) | Size | Tb, obs(1 + z) | Tb, min(1 + z) | Tb, lim(1 + z) | ||||
|---|---|---|---|---|---|---|---|---|---|
| ALMA (a) | J-S | A-X | compact | core | (μas) | (1010 K) | (1010 K) | (1010 K) | |
| Sgr A* | 2450 ± 250 | 1867 ± 312 | 1920 ± 140 | 2270 | 2270 | 53 | 1.4 | 1.1 | 1.2 |
| 3C 279 | 8800 ± 800 | 7050 ± 600 | 6510 ± 300 | 7890 | 2500 | 25 | 14.0 | 7.9 | 20.9 |
| M 87 | 1310 ± 130 | 980 ± 133 | 920 ± 80 | 610 | 610 | 42 | 1.2 | 0.2 | 0.2 |
| OJ 287 | 4270 ± 430 | 3085 ± 1100 | 2970 ± 230 | 3690 | 420 | 14 | 6.4 | 1.8 | 2.2 |
| Cen A | 5660 ± 570 | 4816 ± 367 | 4300 ± 120 | 1750 | 1750 | 30 | 4.3 | 2.0 | 3.3 |
| J1924–2914 | 3200 ± 320 | 2472 ± 345 | 2550 ± 170 | 2470 | 500 | 11 | 14.1 | 19.7 | 78.9 |
| NRAO 530 | 1590 ± 160 | 1248 ± 141 | 1140 ± 60 | 680 | 240 | 13.0 | 6.6 | 4.3 | 6.9 |
| 3C 273 | 7560 ± 760 | 6163 ± 700 | 5220 ± 210 | 6000 | 610 | 8.1 | 25.1 | 9.1 | 38.8 |
| 1749+096 | – | 1806 ± 135 | – | 1600 | 670 | 12.9 | 12.6 | 17.4 | 73.9 |
| 1055+018 | 3550 ± 400 | 2510 ± 140 | 2530 ± 120 | 1240 | 315 | 18.0 | 4.3 | 3.4 | 14.4 |
| BL Lac | – | 1241 ± 112 | – | 1220 | 1220 | 21.1 | 2.1 | 1.9 | 6.7 |
| 3C 84 | – | 9895 ± 321 | 7120 ± 440 | 1880 | 1040 | 17.5 | 8.2 | 6.8 | 29.0 |
| 3C 454.3 | – | 9126 ± 543 | – | 9040 | 9040 | 22.5 | 77.7 | 44.9 | 190.5 |
| CTA 102 | – | 5475 ± 254 | – | 5400 | 5400 | 17.1 | 88.2 | 81.0 | 344.3 |
| J0132–1654 | 415 ± 30 | – | – | 212 | 80 | 8.5 | 5.3 | 2.4 | 3.2 |
| J0006–0623 | 1990 ± 200 | – | – | 930 | 91 | 13.9 | 1.5 | 2.4 | 3.9 |
| NGC 1052 | 400 ± 50 | 350 ± 50 | – | 350 | 350 | 43.0 | 0.5 | 0.1 | 0.2 |
| Cyg X–3 (b) | – | 1770 ± 349 | – | – | – | – | – | – | – |
Notes.
Following Goddi et al. (2021), corresponding to ∼1 arcsec angular scale.
Measurements on April 6 and 7, 2017 with the IRAM 30m telescope at 228.7 GHz yielded respectively S = (2.95 ± 0.44) Jy and S = (2.96 ± 0.26) Jy (Krichbaum 2017). J-S: JCMT-SMA baseline (∼100 kλ or ∼1 arcsec); A-X: ALMA-APEX baseline (∼1.5 Mλ or ∼100 mas); compact: flux density constrained with long EHT baselines on a sub-mas scale.
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