Table 2: Detected transitions of the first torsionally excited state of HCOOCH3 in W51 e2.
  Transitiona $S{\mu}^2$ ${E_{\rm l}}$ Frequency Obs. Freq. b $\int {T_{\rm mb}}\Delta v^c$ $T{\rm _{mb}}$ Commentd
    (D2) (cm-1) (MHz) (MHz) (K km s-1) (mK)  
1(8) 7(4, 4)-6(4, 3) A 12.5 146.86 85 327.104 85 326.864 1.22 87  
2(5) 7(4, 3)-6(4, 2) A 12.5 146.86 85 360.669 85 359.685 0.40 81  
3 7(3, 5)-6(3, 4) A 15.1 143.62 85 371.762 85 371.871 0.67 102  
4 7(6, 2)-6(6, 1) E 4.94 155.53 85 456.630 85 456.067 14.33 1133 CH3CCH
5(2) 7(4, 3)-6(4, 2) E 12.6 146.60 85 506.175 85 506.053 0.57 84  
6 7(5, 3)-6(5, 2) E 9.12 150.40 85 553.365 85 553.361 0.54 78  
7 10(2, 9)-10(1, 10) A 1.40 151.83 85 664.038 85 664.621 1.06 61 C2H3CN
8(1) 7(4, 4)-6(4, 3) E 12.5 146.22 85 743.967 85 743.915 0.79 102  
9(10) 7(2, 5)-6(2, 4) A 17.0 141.50 88 998.368 88 997.692 0.77 83  
10(9) 7(2, 5)-6(2, 4) E 17.1 141.01 89 140.383 89 140.161 1.20 120  
11 25(5, 20)-25(4, 21) A 8.29 274.84 107 021.644 107 021.862 1.99 186  
12 9(2, 8)-8(2, 7) E 22.6 146.68 107 022.162 - - -  
13 10(1, 9)-9(2, 8) A 2.14 150.76 107 472.351 107 472.400 0.27 45  
14 9(3, 7)-8(3, 6) E 20.8 149.16 111 005.617 111 005.832 2.67 261  
15 9(1, 8)-8(1, 7) E 23.2 146.08 111 094.105 111 094.010 2.27 244  
16(17) 12(0, 12)-11(0, 11) A 31.4 155.85 131 536.624 131 536.949 3.53 407  
17(16) 12(0, 12)-11(0, 11) E 31.6 155.29 131 612.344 131 612.094 3.97 410  
18 12(1, 12)-11(0, 11) A 4.87 155.85 131 764.316 131 765.100 1.70 100 S18O
19 11(5, 7)-10(5, 6) A 23.1 164.85 134 531.846 134 531.411 3.44 478 SO2 $\upsilon_2=1$
20 27(7, 20)-27(6, 21) A 8.58 304.51 134 545.609 134 546.431 7.95 630 C3H2CN + 33SO2
21 11(7, 5)-10(7, 4) E 17.4 175.45 134 545.615 - - - -
22 35(8, 27)-35(7,28) A 12.6 416.62 134 553.290 134 553.647 0.71 991 33SO2
23(25) 11(5, 6)-10(5, 5) A 23.1 164.85 134 585.070 134 584.263 4.68 382 C3H2CN $\upsilon_{\rm t}$, $\upsilon _{\rm b} = 1$ and ?
24 11(3, 9)-10(3, 8) E 26.7 156.97 134 713.629 134 713.062 3.59 456  
25(23) 11(5, 6)-10(5, 5) E 23.3 164.70 134 739.630 134 739.110 3.55 386  
26(28) 12(2, 11)-11(2, 10) A 30.6 159.00 140 020.525 140 020.145 2.96 472  
27 11(2, 9)-10(2, 8) A 28.1 155.98 140 166.667 140 166.502 3.42 528  
28(26) 12(2, 11)-11(2, 10) E 30.8 158.50 140 324.728 140 324.321 7.66 470  
29 13(1, 13)-12(1, 12) E 34.2 159.69 142 032.334 142 031.811 4.52 586  
30(31) 13(0, 13)-12(0, 12) A 34.0 160.24 142 052.800 142 052.867 5.95 724  
31(30) 13(0, 13)-12(0, 12) E 34.2 159.68 142 125.416 142 125.086 4.01 559  
32 13(1, 13)-12(0, 12) A 5.34 160.24 142 185.220 142 184.202 0.81 121  
33(35) 15(0, 15)-14(1, 14) A 6.27 170.07 163 042.398 163 042.050 2.32 363  
34(38) 15(1, 15)-14(1, 14) A 39.3 170.07 163 086.032 163 085.494 6.39 884 HCOOCH3 $\upsilon_{\rm t}=0$
35(33) 15(0, 15)-14(1, 14) E 6.07 169.52 163 113.094 163 113.656 5.11 549 SO2
36(39) 15(0, 15)-14(0, 14) A 39.3 169.52 163 118.722 163 118.285 19.40 2184 SO2
37 14(1, 13)-13(1, 12) E 36.2 168.12 163 142.587 163 141.991 7.69 967  
38(34) 15(1, 15)-14(1, 14) E 39.6 162.52 163 154.325 163 153.604 8.99 855  
39(36) 15(0, 15)-14(0, 14) E 39.6 169.52 163 185.864 163 185.586 5.15 679  
40 15(1, 15)-14(0, 14) E 6.07 169.52 163 227.097 163 227.290 4.23 448  
41(44) 16(0, 16)-15(1, 15) A 6.73 175.51 173 616.616 173 617.000 1.80 177  
42(46) 16(1, 16)-15(1, 15) A 42.0 175.51 173 641.411 173 636.978 15.14 1288 HCOOCH3 $\upsilon_{\rm t}=0$
43(47) 16(0, 16)-15(0, 15) A 42.0 175.51 173 660.281 173 659.384 4.12 380  
44(41) 16(0, 16)-15(1, 15) E 6.50 175.51 173 683.479 173 186.987 17.8 5300 CH3CHO
45 24(3, 21)-24(2, 22) A 4.32 254.06 173 704.470 173 706.183 9.03 644  
46(42) 16(1, 16)-15(1, 15) E 42.2 174.96 173 706.683 173 706.183 - -  
47(43) 16(0, 16)-15(0, 15) E 42.2 174.97 173 724.731 173 724.558 2.02 479  
48 16(1, 16)-15(0, 15) E 6.6 174.97 173 747.990 173 748.150 3.94 264  
49(51) 16(5, 11)-15(5, 10) E 38.2 191.37 198 384.885 198 384.516 5.23 467  
50 26(8,19)-26(7, 20) A 6.92 297.43 198 429.332 198 428.202 1.67 231 c-C2H4
51(49) 16(5, 11)-15(5, 10) A 38.3 191.52 198 539.350 198 541.500 19.44 1400 HCOOCH3 $\upsilon_{\rm t}=0$
52 16(5, 12)-15(5, 11) E 38.1 191.05 198 578.563 198 577.928 3.20 484  
53 19(3, 16)-18(4, 15) A 2.8 208.13 207 295.959 207 296.361 5.16 159 CH3CH2CN
54 17(12, 5)-16(12, 4) A 21.2 252.96 207 354.058 207 352.197 5.57 557  
55 17(12, 6)-16(12, 5) A 21.2 252.96 - - - -  
56 17(13, 5)-16(13, 4) E 18.8 264.55 207 376.777 207 378.506 11.46 995 CH2NH
57 17(9, 8)-16(9, 7) E 32.5 223.90 207 397.312 207 396.134 8.62 758  
58 17(11, 6)-16(11, 5) A 26.2 242.28 207 404.993 207 404.612 5.67 690  
59 17(11, 7)-16(11, 6) A 26.2 242.28 - - - -  
60 17(10, 8)-16(10, 7) A 29.5 232.53 207 500.297 207 499.521 4.8 897  
61 17(10, 7)-16(10, 6) A 29.5 232.53 - - - -  
62 19(2, 18)-18(1, 17) A 6.56 199.21 215 130.469 215 130.828 2.59 394 CH3CH2CN
63(67) 18(5, 13)-17(5, 12) A 44.1 205.21 225 648.010 225 647.974 5.16 1103 HCOOCH3 $\upsilon_{\rm t}=0$
64 19(2, 17)-18(2, 16) A 48.7 203.74 225 702.569 225 698.559 184 1400 H2CO
65 6(6, 1)-5(5, 0) A 2.59 148.59 225 727.540 225 726.732 2.55 372 CH2DCN
66 6(6, 0)-5(5, 1) A 2.59 148.59 225 727.552 - - - -
67(63) 18(5, 13)-17(5, 12) E 43.4 205.06 225 756.154 225 755.178 7.3 927  
68 7(6, 1)-6(5, 2) A 25.6 229.84 237 899.08 237 896.263 15.91 1.667 NH2CHO
69 20(3, 18)-19(2, 17) A 5.37 211.27 237 969.273 237 969.938 12.80 1.186 unidentified species
70 37(7, 31)-37(6, 32) A 8.54 434.55 238 027.934 238 026.742 1.12 122  
71 20(14, 7)-19(14, 6) E 27.1 299.15 244 000.464 243 999.803 7.82 596  
72 20(15, 6)-19(15, 5) A 23.3 312.58 244 048.806 244 048.230 90.33 10.84 H2CS
73 20(15, 5)-19(15, 4) A 23.3 312.58 - - - - -
74 19(4, 15)-18(4, 14) A 18.4 209.57 244 066.113 244 066.720 5.49 730  
75 20(14, 7)-19(14, 6) A 14.2 299.10 244 073.956 244 073.440 3.54 314 unidentified species
76 20(14, 6)-19(14, 5) A 14.2 299.10 - - - -  
77 20(10, 10)-19(10, 9) E 39.9 254.74 244 112.669 244 112.254 2.65 677  
78(82) 20(13, 8)-19(13, 7) A 21.0 286.55 244 119.960 244 119.708 2.95 886  
79 20(13, 7)-19(13, 6) A 21.0 286.55 - - - -  
80 20(12, 8)-19(12, 7) A 34.0 274.94 244 198.512 244 198.232 7.43 1107  
81 20(12, 9)-19(12,8) A 34.0 274.94 - - - -  
82(78) 20(13, 8)-19(13, 7) E 30.7 286.54 244 207.619 244 206.113 7.33 893 unidentified species
a The notation for the quantum numbers is the same as Table 1 except that it does not contain information on the parity of the level, i.e. the signs present in Table 1 (associated to $K_{\rm a}$ for the E species and in a separate column for the A species) have been suppressed; b observed frequencies for a systemic velocity of $V_{\rm lsr} = 55.3$ km s-1; c the line width is of the order of 7-8 km s-1; d this column indicates the molecules blended with the detected HCOOCH3 $\upsilon _{\rm t} = 1$ transitions. The dashes indicates that the value is the same as the one in the previous line.


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