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Table 1

Spectroscopic sample selection criteria and redshift determination statistics.

Selection criteriaa Targets actually observed zspec ≥ 0 zspec > 1.4
ID Pb Prioc M(AB)d zphot other # Tote Redf Bluef P73g P74g q = 1h q = 0h q = 1h q = 0h

S2 P73 B1 B < 26.0 1.4 < z < 2.5 z − K < 2.3 122 103 31 91 39 71 95 4 90 4
S5b P73 B2 B < 26.0 z > 2.5 5 5 1 5 5 2 5 0 5 0
S1 P73 R1 I < 26.0 1.4 < z < 2.5 z − K > 2.3 30 24 23 2 17 12 12 4 12 3
S5 P73 R2 I < 26.0 z > 2.5 23 15 10 7 5 12 7 3 6 3
S6 P73 R3 I < 26.0 1.4 < z < 2.5 1.8 < z − K < 2.3 22 15 13 4 6 11 9 2 9 2
S7 P73 R4 I < 26.0 1.4 < z < 2.5 1.6 < z − K < 1.8 18 15 8 9 9 8 10 3 10 3
S8 P73 R5 I < 26.0 1.4 < z < 2.5 1.4 < z − K < 1.6 24 17 7 12 7 14 13 0 12 0
P73 Total unique targets in P73 samples (S2-S8) 202 86 61 34 44 57 51 12 49 11

S21 P74 B1 B < 26.5 z > 1.4 I > 26.0 1 1 1 1 0 1 1 0 1 0
S22 P74 B2 B < 26.5 z > 1.4 I < 26.0 94 71 19 70 1 70 64 2 59 2
S25 P74 R1 I < 26.0  − BzKi, z − K > 2.5 8 8 8 0 0 8 7 1 5 0
S27 P74 R2 I < 26.0 z > 4.0 4 4 4 0 0 4 1 2 0 2
S28 P74 R3 I < 26.0 z > 1.4 B < 26.5 25 12 12 0 0 12 5 3 5 3
S29 P74 R4 I < 26.0  − BzKi, 2.2 < z − K < 2.5 11 9 9 0 0 9 7 0 1 0
S30 P74 R5 I < 26.0  − J − K > 3 (Vega) 3 3 3 0 0 3 0 1 0 1
S31 P74 R6 Promising faint targets in P73 masks 7 7 7 0 7 6 3 1 3 1
P74 Total unique targets in P74 samples (S21-S31) 144 114 62 71 8 112 88 10 74 9

P73+P74 Total unique targets in red or blue sample 221 174 92 105 66 125 135 15 120 13
P73+P74 Total unique targets in red sample 135 102 77 34 44 73 64 14 54 12
P73+P74 Total unique targets in blue sample 140 115 34 103 44 80 104 4 98 4
P73+P74 Total fillers from catalogue 40 17 23 19 21 33 0 5 0
P73+P74 Total fillers not in catalogue 41 25 16 15 16 26 3 8 2

Notes. 

(a)

Additional criteria valid for all samples are m(4.5) < 23.5, crfl  ≤  2, and no secure known redshift from earlier spectroscopic surveys. For the P74 samples, targets already included in the P73 masks were excluded (except in sample S31). Note that the sample selection criteria are not mutually exclusive, i.e., objects can appear in more than one sample.

(b)

Sample constructed for mask design in observing period 73 (P73) or 74 (P74).

(c)

Priority during mask design for inclusion in a mask.

(d)

Magnitude limit in B or I (AB).

(e)

Total number of targets from this sample actually included in a spectroscopic mask.

(f)

Observed in either a red or blue mask.

(g)

Observed in either period 73 (P73) or period 74 (P74).

(h)

Redshift determination quality flag, for either a (1) secure or (0) tentative determination.

(i)

BzK here indicates (z − K) − (B − z) <  − 0.2.

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