Table 1
Target prioritisation categories.
Priority | Criteria | Total targets/MSA footprint | Targets allocated | JWST-only targets | Success(4) rate | Interloper fraction |
---|---|---|---|---|---|---|
1 | z(1)> 8.5, F160W < 29 (HST) OR F115W dropout or higher | robust zphot > 9 & & Detection band < 29.5 (JWST) AND identified as robust from visual inspection | 6 | 6 | 2 | 83% | 0% |
2 | As for Class 1 but lower visual inspection score | 6 | 2 | 2 | 50% | 0% |
3 | z > 8.5, F160W > 29 (HST) AND not rejected at visual inspection Some objects not identified as robust originally in Classes 1 and 2 are demoted to this class | 9 | 3 | 2 | >33%(a) | <33%(a) |
4 | 5.7 < z < 8.5, pass rest-UV cut (HST) OR 6 < z < 8.5, detection band < 27.5 (JWST) AND identified as robust from visual inspection | 76 | 20 | 1 | 85% | 5%(b) |
5 | 2 < zphot < 5.7, F160W < 23 (HST) OR zphot > 2, any filter < 22.5 (JWST) | 18 | 5 | 1 | ||
6.1 | 5.7 < z < 8.5, F160W < 29 (HST) 5.7 < z < 8.5, (F105W < 29|F150W < 29) (JWST) AND not rejected at visual inspection | 100 | 9 | 3 | 89% | 11% |
6.2 | 5.7 < z < 8.5, F160W > 29 (HST) OR 5.7 < z < 6.5, F444W(2) < 27.5 (JWST) AND not rejected at visual inspection | 102 | 7 | 1 | 57% | 29% |
7.1 | 4.5 ≤ z < 5.7, F160W < 29 (HST) OR 4.5 ≤ z < 5.7, F444W(2) < 27.5 (JWST) AND rare galaxy up-weighting(3) | 4 | 1 | 0 | ||
7.2 | 3.5 ≤ z < 4.5, F160W < 29 (HST) OR 3.5 ≤ z < 4.5, F444W(2) < 27.5 (JWST) AND rare galaxy up-weighting(3) | 5 | 1 | 0 | ||
7.3 | 2.5 ≤ z < 3.5, F160W < 29 (HST) OR 2.5 ≤ z < 3.5, F444W(2) < 27.5 (JWST) AND rare galaxy up-weighting(3) | 12 | 0 | 0 | ||
7.4 | 1.5 ≤ z < 2.5, F160W < 29 (HST) OR 1.5 ≤ z < 2.5, F444W(2) < 27.5 (JWST) AND rare galaxy up-weighting(3) | 18 | 1 | 0 | ||
7.5 | 4.5 ≤ z < 5.7, F160W < 29 (HST) OR 4.5 ≤ z < 5.7, F444W(2) < 27.5 (JWST) | 246 | 23 | 2 | 83% | 4% |
7.6 | 3.5 ≤ z < 4.5, F160W < 29 (HST) OR 3.5 ≤ z < 4.5, F444W(2) < 27.5 (JWST) | 570 | 31 | 1 | 71% | 3% |
7.7 | 2.5 ≤ z < 3.5, F160W < 29 (HST) OR 2.5 ≤ z < 3.5, F444W(2) < 27.5 (JWST) | 1015 | 45 | 4 | 78% | 4% |
7.8 | 1.5 ≤ z < 2.5, F160W < 29 (HST) OR 1.5 ≤ z < 2.5, F444W(2) < 27.5 (JWST) | 1565 | 47 | 4 | 64% | 4% |
8.1 | F160W > 28.5, 1.5 ≤ z < 5.7 AND has Gaia2 coords (HST) OR 1.5 ≤ z < 5.7, 27.5 < F444W(2) < 29 (JWST) | 2119 | 20 | 3 | ||
8.2 | 24.5 <F160W< 29, z < 1.5 AND has Gaia2 coords (HST) OR z < 1.5, F444W(2) < 29 (JWST) | 836 | 17 | 1 | ||
8.3 | F160W > 29, z < 1.5 AND has Gaia2 coords (HST) | 361 | 3 | 0 | ||
9 | fillers (not deliberately rejected) | 1569 | 12 | 0 |
Notes. The HST and JWST entries for each class denote the different priority criteria whether the source was primarily selected from JWST or HST(see text for details). The number of targets per MSA footprint were estimated from the full field of view. (1)In this table, z denotes a redshift estimate either from a photometric redshift, or from dropout criteria. (2)Denotes photometry derived from Kron apertures. (3)“Rare galaxy up-weighting” was applied to targets that were identified as candidates for being either quiescent, hosting an active galactic nucleus (AGN), or Lyman-continuum leakers. (4)The success rate is the fraction of galaxies targeted who had a spectroscopic redshift measured within Δz = 0.1 of the predicted redshift interval for that priority class. Galaxies lying outside this range are classed as interlopers. (a)The spectrum of object 9992 is Class 3 is ambiguous and may show two sources, a low-redshift galaxy at z = 1.962 and hints of a second galaxy at z > 9. (b)One target in Class 4 for which we did not get a good spectrum, 10035328, is a star (with a proper motion of
between HST/WFC3 and NIRCam) and we class it as an interloper.
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