Open Access
Table 1
Relative astrometric uncertainty noise survey.
| σpos (µas) | Separation (µas) | ||
|---|---|---|---|
| Noise case | 5 | 10 | 15 |
| 0% + 0 mJy | 2.19/0.06 | 0.04/0.03 | 0.02/0.02 |
| 0% + 5 mJy | 2.62/1.50 | 0.38/0.12 | 0.23/0.13 |
| 0% + 10 mJy | 2.62/2.27 | 2.57/0.39 | 2.57/0.23 |
| 10% +0mJy | 2.56/0.28 | 0.21/0.08 | 0.11/0.07 |
| 10% +5mJy | 2.58/1.58 | 0.59/0.13 | 0.26/0.14 |
| 10% + 10 mJy | 2.61/2.31 | 2.85/0.45 | 0.91/0.23 |
| 20% + 0 mJy | 2.52/1.00 | 0.62/0.11 | 0.20/0.12 |
| 20% + 5 mJy | 2.54/1.77 | 1.37/0.15 | 0.33/0.17 |
| 20% + 10 mJy | 2.67/2.39 | 3.62/0.52 | 1.40/0.25 |
Notes. FWHM of both sources is fixed at 2 µas. The combined total flux density is set to 50 mJy, inline with BHEX’s minimum detectability condition (see Fig. 4). In each cell, the relative astrometric uncertainty is provided for ground/ground + BHEX.
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