Table 1
Line properties for the low-energy level transitions of 
.
| Transition | Rest frequency | Redshifted freq. | S ul | Elow | τlte(b) | αLTE (c) | τnlte(d) | |
|---|---|---|---|---|---|---|---|---|
| (MHz) | (a) (GHz) | (K) | (10−3) | (1012 cm−2 km−1 s) | (10−3) | |||
| 110−110 | (ortho) | 368 572.160 (0.02) | 195.444 | 4.50 | 3.1(e) | 4.5(e) | 14.8 | 5.0 |
| 212−101 | (ortho) | 494034.065 (0.06) | 261.973 | 4.50 | 3.1(e) | 4.6 | 14.5 | 5.1(f) |
| 212−303 | (ortho) | 166076.743 (0.10) | 88.066 | 3.0 | 18.9 | 0.12 | 572 | 0.60 |
| 312−-303 | (ortho) | 375 749.247 (0.02) | 199.250 | 10.4 | 18.9 | 0.48 | 137 | 2.1 |
| 414−303 | (ortho) | 615 171.173 (0.17) | 326.209 | 7.5 | 18.9 | 0.36 | 183 | 1.6 |
| 414−505 | (ortho) | 25 218.734 (0.04) | 13.373 | 6.3 | 47.2 | … | … | 4.4 |
| 514−505 | (ortho) | 388 929.620 (0.03) | 206.239 | 16.1 | 47.2 | … | … | 11.0 |
| 616−505 | (ortho) | 730 775.644(0.34) | 387.511 | 10.7 | 47.2 | … | … | 7.6 |
| 716−707 | (ortho) | 408 557.779 (0.03) | 216.647 | 21.3 | 88.1 | … | … | 1.5 |
| 818−707 | (ortho) | 841 268.511 (0.56) | 446.102 | 14.1 | 88.1 | … | … | 1.0 |
| 1ll−000 | (para) | 431 315.570 (0.03) | 228.715 | 1.0 | 0.0 | 1.8 | 11.9 | 1.9(f) |
| 1ll−202 | (para) | 234 505.803 (0.04) | 124.352 | 0.5 | 9.4 | 0.13 | 164 | 0.29 |
| 2ll−202 | (para) | 371 430.433 (0.03) | 196.960 | 2.5 | 9.4 | 0.72 | 30.5 | 1.5 |
| 313−202 | (para) | 555 312.451 (0.11) | 294.467 | 2.0 | 9.4 | 0.60 | 37.0 | 1.2 |
| 413−404 | (para) | 381 565.745 (0.03) | 202.334 | 4.4 | 31.5 | … | … | 1.4 |
| 606−515 | (para) | 47086.012 (0.03) | 24.968 | 2.6 | 63.8 | … | … | −1.0 |
| 615−606 | (para) | 397 902.529 (0.03) | 210.997 | 6.3 | 66.1 | … | … | 2.4 |
| 7l7−606 | (para) | 786626.662 (0.44) | 417.127 | 4.1 | 66.1 | … | … | 1.6 |
Notes. Spectroscopic parameters are taken from the CDMS database (Müller et al. 2005; Endres et al. 2016). (a) Redshifted frequency in the heliocentric rest frame, where the redshift z = o.88582 is set. (b) We assume a total column density Ncol(O) + Ncol(P) = 2 × 10l2 cm−2, an ortho-to-para ratio OPR = 3, and a Gaussian profile with a FWHM linewidth of 20 km s−1 to calculate the line peak opacity τ under LTE. (c) The coefficient αLTE is defined as Ncol(O, P) = αLTE × ∫ τdv. (d) Example of non-LTE excitation with guessed collision rates at Tk = 100 K, n(H2) = 1000 cm−3, Tform = 300 K, destruction rate 9.5 × 10−7 s−1, total column density 7.5 × 1012 cm−2, FWHM = 20 km s−1. (e) The ground-state level of ortho
is 3.1 K higher than that of the para form (see Fig. A.2). (f) Detected in this work.
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