Table A.4
Average column densities and abundances for molecules with hyperfine multiplet lines in a square region from [20′′, 20′′] to [−20′′, −20′′] of four IRDCs observed by IRAM 30 m.
| Species | G28.34 S | IRDC 18530 | IRDC 18306 | IRDC 18308 | ||||
| Tex,α (K) | (12 K) | Tex,α (K) | (9 K) | Tex,α (K) | (8 K) | Tex,α (K) | (12 K) | |
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| I. Molecular column density [x ± y(z) = (x ± y) × 10z cm-2] | ||||||||
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| N2H+ | 1.76 ± 0.05(16) | 1.46 ± 0.02(15) | 2.30 ± 0.57(17) | 2.94 ± 0.43(15) | 7.46 ± 1.32(17) | 4.24 ± 0.51(15) | 5.11 ± 0.45(14) | 2.59 ± 0.49(14) |
| C2H | 4.93 ± 0.80(14) | 2.81 ± 0.42(15) | 1.59 ± 0.73(14) | 5.50 ± 2.16(14) | 3.63 ± 0.84(14) | 1.11 ± 0.23(15) | 3.09 ± 4.83(13) | 1.20 ± 1.26(14) |
| HCN | 4.40 ± 2.83(13) | 4.18 ± 1.88(13) | 7.15 ± 0.41(13) | 6.31 ± 0.82(13) | 1.68 ± 0.31(17) | 5.50 ± 1.60(15) | 3.06 ± 0.11(15) | 4.36 ± 1.49(14) |
| H13CN | 9.27 ± 0.28(14) | 1.01 ± 0.35(13) | 5.70 ± 62.60(14) | 4.58 ± 114.17(13) | 6.94 ± 6.64(15) † | 8.11 ± 23.23(14) | 3.91 ± 77.43(14) † | 1.51 ± 63.62(13) |
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| II. Molecular abundances with respect to H2 [x ± y(z) = (x ± y) × 10z] | ||||||||
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| N2H+ | 1.33 ± 1.49(−7) | 1.11 ± 0.18(−8) | 1.34 ± 1.15(−6) | 1.72 ± 0.53(−8) | 3.91 ± 4.29(−6) | 2.22 ± 1.11(−8) | 8.35 ± 9.49(−9) | 4.24 ± 2.04(−9) |
| C2H | 3.72 ± 4.98(−9) | 2.12 ± 0.67(−8) | 9.28 ± 15.50(−10) | 3.21 ± 1.90(−9) | 1.90 ± 3.13(−9) | 5.81 ± 3.59(−9) | 5.06 ± 16.10(−10) | 1.96 ± 3.05(−9) |
| HCN | 3.32 ± 6.28(−10) | 3.16 ± 2.10(−10) | 4.18 ± 5.04(−10) | 3.69 ± 1.07(−10) | 8.78 ± 13.90(−7) | 2.88 ± 2.08(−8) | 5.00 ± 6.00(−8) | 7.12 ± 4.77(−9) |
| H13CN | 7.01 ± 8.29(−9) | 7.64 ± 4.17(−10) | 3.33 ± 45.60(−9) | 2.68 ± 76.66(−10) | 3.63 ± 9.50(−8) † | 4.24 ± 17.63(−10) | 6.40 ± 166.00(−9) † | 2.48 ± 130.00(−10) |
Notes. 1. Column densities and abundances in italic font are obtained at the temperatures listed in Table 6, under CTEX assumption. 2. Column densities and abundances in roman font are obtained at mean Tex,CO, with LTE assumption. 3. Uncertainties on the measured values are determined from hyperfine multiplet fit to τ0Δυ and Tex,α or Tex,CO. 4. “†” denotes a species whose distribution is less extended than the 30 m primary beam (filling factor f< 0.5).
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