Table 3
Summary of various upcoming H i 21 cm absorption line surveys.
| Survey | Redshift | Time per pointing | Spectral r.m.s. | Sky coverage | Total time | Number | |
| [H i 21 cm] | [h] | [mJy] | [deg2] | [h] | of lines of sight | ||
|
|
|||||||
| Apertif – SHARP | 0–0.26 | 12 | 1.3 | 4000 | 6000 | 25 000 | |
| (>30 mJy) | |||||||
| ASKAP – FLASH | 0.4–1.0 | 2 | 3.8 | 25 000 | 1600 | 65 000 | |
| (>90 mJy) | |||||||
| ASKAP – Wallaby | 0–0.26 | 8 | 1.6 | 30 000 | 8000 | 132 000 | |
| (>40 mJy) | |||||||
| MeerKAT – MALS | 0–0.57 | 1.4 | 0.5 | 1300 | 1333 | 16 000 | |
| (L-band) | (>15 mJy) | ||||||
| MeerKAT – MALS | 0.40–1.44 | 1.7–2.8 | 0.5–0.7 | 2000 | 2125 | 33 000 | |
| (UHF-band) | (>15 mJy) | ||||||
Notes. The two-part MALS project, MALS L-band, and MALS UHF are targeted surveys focussing on relatively bright, high redshift background sources to search the line of sight for intervening absorption. However, with the more than 1 × 1 deg2 field of view of MeerKAT, a substantial volume for each pointing is blindly, and commensally, probed both for associated and intervening absorbers. SHARP and WALLABY are both commensal HI emission and absorption surveys, primarily investigating associated absorption. FLASH is a blind survey of the southern hemisphere to detect H i absorption in intervening and associated systems at intermediate redshifts (z ~ 1).
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