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Table 1

Targeted transitions and observational results.

Frequency E up g up A ul Beam size rms1 N
Molecule Transition (MHz) (K) (s-1) (″) (K) (cm-2)
H2S2 61,5–50,5 223 535.85 20.8 39 4.23 × 10 -5 28 ... ...2
H2S2 132,11–141,13 224 367.15 87.8 81 1.64 × 10 -5 28 0.0018 ≤1.7 × 1015
H2S2 132,12–141,14 224 657.47 87.8 27 1.65 × 10 -5 28 ... ...2
H2S2 81,7–70,7 251 423.70 30.8 51 5.92 × 10 -5 25 0.0026 ≤6.1 × 1014
H2S2 112,9–121,11 252 271.50 71.0 69 2.25 × 10 -5 25 0.0025 ≤1.7 × 1015
H2S2 112,10–121,12 252 486.63 71.0 23 2.25 × 10 -5 25 ... ...2
H2S2 101,9–90,9 279 312.25 43.5 63 8.04 × 10 -5 22 ... ...2
H2S2 92,7–101,9 280 174.30 57.0 57 2.94 × 10 -5 22 ... ...2
H2S2 92,8–101,10 280 325.68 57.0 19 2.94 × 10 -5 22 0.0022 ≤3.7 × 1015
H2S2 141,13–130,13 335 087.32 77.0 87 1.37 × 10 -4 19 ... ...2
H2S2 52,3–61,5 335 971.39 36.9 33 4.05 × 10 -5 19 0.0036 ≤2.1 × 1015
H2S2 52,4–61,6 336 029.02 36.9 11 4.05 × 10 -5 19 ... ...2
HS 160,16,16,15–150,15,15,143 252 270.66 103.1 31 1.22 × 10 -4
HS 160,16,16,16–150,15,15,153 252 270.71 103.1 33 1.22 × 10 -4 25 0.0028 ≤ 8.0 × 1014
HS 41,3,5,4–40,4,5,43 280 022.63 21.0 9 7.45 × 10 -5
HS 41,3,5,5–40,4,5,53 280 023.28 21.0 11 7.49 × 10 -5 22 0.0027 ≤ 1.6 × 1015
HS 211,20,22,22–201,19,21,213 333 247.58 189.7 45 2.84 × 10 -4
HS 211,20,22,21–201,19,21,203 333 247.67 189.7 43 2.84 × 10 -4 19 0.0052 ≤ 1.3 × 1015
S2 1110–99 224 301.13 82.1 21 3.02 × 10 -7 28 0.0017 ≤2.2 × 1016
S2 1514–1313 333 685.77 126.3 29 7.78 × 10 -7 19 0.0039 ≤2.3 × 1016

Notes.

(1)

rms is given in 5 km s-1 bins;

(2)

since these spectral regions present line contributions from other species near the frequency of the H2S2 transition, we have not used the corresponding noise rms value to compute the 1σ upper limits to the column density;

(3)

the last two quantum numbers designate the spin quanta.

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