Table 2
List of the HAWK-I@VLT data set used for this work.
| Filter | Ndither | Step | Exposure time | Image quality | Airmass | σ(Radial residual) |
| (arcsec) | (NDIT × DIT) | (arcsec) | (secz) | (mas) | ||
|
|
||||||
| Commissioning 1, August 3−6, 2007 | ||||||
| Bulge – Baade’s window (#1) | ||||||
| J | 25 | 95 | (6 × 10 s) | 0.56−1.07 | 1.038−1.085 | 4.5 |
| H | 25 | 95 | (6 × 10 s) | 0.40−0.76 | 1.081−1.149 | 4.3 |
| K S | 25 | 95 | (6 × 10 s) | 0.25−0.45 | 1.042−1.091 | 2.8 |
| Bulge – Baade’s window (Rotated by 135°) (#2) | ||||||
| K S | 25 | 95 | (6 × 10 s) | 0.49–0.85 | 1.015−1.044 | 5.6 |
| NGC 6121 (M 4) | ||||||
| J | 4 × 25 | 95 | (6 × 10 s) | 0.36−1.04 | 1.010−1.540 | 6.5 |
| K S | 5 | 140 | (6 × 10 s) | 0.40−0.51 | 1.050−1.056 | 3.8 |
| NGC 6822 | ||||||
| J | 9 | 190 | (12 × 10 s) | 0.61−0.83 | 1.028−1.049 | 5.3 |
| K S | 9 | 190 | (12 × 10 s) | 0.43−0.75 | 1.050−1.082 | 4.8 |
| Commissioning 2, October 14−19, 2007 | ||||||
| NGC 6656 (M 22) | ||||||
| K S | 25 | 47.5 | (6 × 10 s) | 0.28−0.41 | 1.252−1.420 | 3.1 |
| NGC 6388 | ||||||
| J | 25 | 95 | (6 × 10 s) | 0.64−0.94 | 1.287−1.428 | 9.7 |
| K S | 25 | 95 | (6 × 10 s) | 0.50−0.75 | 1.436−1.637 | 12.2 |
| JWST calibration field (LMC) | ||||||
| J | 25 | 95 | (6 × 10 s) | 0.51−0.65 | 1.408−1.412 | 5.3 |
| K S | 24 | 95 | (6 × 10 s) | 0.45−0.60 | 1.411−1.429 | 4.8 |
|
|
||||||
| Commissioning 3, November 28−30, 2007 | ||||||
| NGC 104 (47 Tuc) | ||||||
| J | 25 | 47.5 | (6 × 10 s) | 0.51−0.82 | 1.475−1.479 | 7.1 |
| K S | 23 | 47.5 | (6 × 10 s) | 0.54−1.01 | 1.475−1.483 | 15.0 |
Notes. Ndither is the number of dithered images per observing block. “Step” is the dither spacing (shift in arcsec from one exposure to the next one). The integration time (DIT) times the number of individual integrations (NDIT) gives the exposure time. σ(Radial residual) gives an assessment of the astrometric accuracy reached (see Sect. 5.5 for the full description).
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