Table 2.
Noise levels for the H I cubes.
| Array | Corr. | r | Noise σ | Beam | PA (beam) | NHI |  |
F | MHI |
|---|---|---|---|---|---|---|---|---|---|
| mode | (μJy beam−1) | (arcsec) | (° ) | (1018 cm−2) | (Jy km s−1) | (108 M⊙) | |||
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
| MeerKAT-16 | 32k | 2.0 | 1040 | 62.7 × 54.2 | 68.4 | 1.9 | 9.7 | 10.93 ± 0.29 | 3.5 ± 0.1 |
| MeerKAT-64 | 4k | 0.0 | 120 | 8.0 × 7.5 | 97.5 | 97.8 | 58.7 (a) | 10.70 | 3.5 |
| 4k | 0.5 | 97 | 11.5 × 10.1 | 113.2 | 40.8 | 24.5 (a) | 11.69 | 3.8 | |
| 4k | 1.0 | 86 | 23.7 × 16.6 | 124.6 | 10.7 | 6.4 (a) | 12.14 | 3.9 | |
| 4k | 1.5 | 85 | 30.7 × 21.8 | 122.9 | 6.2 | 3.7 (a) | 11.93 | 3.9 | |
| MeerKAT-64 | 32k | 0.0 | 358 | 8.2 × 6.8 | 155.5 | 39.3 | 201.2 | 10.45 ± 0.16 | 3.4 ± 0.1 |
| 32k | 0.5 | 283 | 13.7 × 9.8 | 139.7 | 12.9 | 66.0 | 11.28 ± 0.14 | 3.6 ± 0.1 | |
| 32k | 1.0 | 255 | 25.4 × 18.7 | 139.4 | 3.3 | 16.9 | 11.98 ± 0.11 | 3.9 ± 0.1 | |
| 32k | 1.5 | 247 | 30.3 × 25.9 | 143.1 | 1.9 | 9.7 | 11.87 ± 0.09 | 3.8 ± 0.1 | |
Notes.
These column densities are scaled from values measured with a wider 45 km s−1 channel and are listed here merely for comparison. They cannot be measured directly from the data set.
(1): MeerKAT array configuration. (2) Correlator mode. The 4k mode has a channel width of 44 km s−1; the 32k mode 5.5 km s−1. (3) Value of the robustness parameter r. (4) Noise σ in a single channel in μJy beam−1. (5) Size of the synthesised beam in arcseconds. (6) Position angle of the major axis of the beam. (7) The 1σ column density sensitivity in a single channel (×1018 cm−2). (8) The 3σ column density for a 16 km s−1 line width (assuming a single channel). (9) Integrated H I flux F (in Jy km s−1) with associated uncertainty. No uncertainty is given for the 4k data, due to the small number of channels with emission. (10) Total H I mass, derived from Col. (9) and assuming a distance of 11.7 Mpc (×108 M⊙).
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