Table 10
Transitions of methyl formate observed with the Plateau de Bure Interferometer toward position MF1 in Orion-KL.
| No. | Set | Frequency | Transition | E up | Sμ 2 | sigma | v | Δv1/2 | T B | W | Nup/gup | Source size | Comments | |
| (MHz) | (K) | (D2) | (K) | (km s-1) | (km s-1) | (K) | (K km s-1) | (1012 cm-2) | (″ × ″) | PA(°) | ||||
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) | (13) | (14) | (15) |
|
|
||||||||||||||
| 1 | 1 | 80531.669(0.030) | 92,8−90,9 E, (vt = 1) | 216 | 0.6 | 0.05 | – | – | ≲0.15 | ≲0.6 | ≲1.04 | – | – | not detected |
| 2 | 1 | 80565.210(0.010) | 102,8−93,7 E | 36 | 1.1 | 0.05 | 7.9(0.1) | 3.8(0.3) | 0.51 | 2.0(0.1) | 1.88 | 10.0 × 7.0 | 10 | detected |
| 3 | 1 | 80572.589(0.010) | 102,8−93,7 A | 36 | 1.1 | 0.05 | 8.0(0.5) | 4.3(1.5) | 0.47 | 2.2(0.5) | 2.07 | 10.0 × 8.0 | 45 | detected |
| 4 | 2 | 80604.508(0.030) | 129,3−138,5 E, (vt = 1) | 288 | 0.2 | 0.09 | – | – | ≲0.31 | ≲1.3 | ≲6.73 | – | – | blend |
| 5 | 2 | 80652.521(0.010) | 154,11−145,10 A | 83 | 1.0 | 0.09 | – | – | ≲0.74 | ≲3.0 | ≲3.10 | – | – | blend |
| 6 | 3 | 101202.806(0.010) | 91,9−80,8 A, (vt = 1) | 213 | 4.2 | 0.04 | 7.6(0.1) | 3.5(0.2) | 1.02 | 3.8(0.2) | 0.75 | – | – | partial blend |
| with U-line | ||||||||||||||
| 7 | 3 | 101210.208(0.004) | 243,21−252,24 A | 187 | 0.04 | 0.04 | – | – | ≲0.12 | ≲0.4 | ≲8.68 | – | – | not detected |
| 8 | 3 | 101279.006(0.010) | 91,9−80,8 E, (vt = 1) | 212 | 4.0 | 0.04 | 7.8(0.1) | 3.4(0.1) | 1.18 | 4.3(0.1) | 0.89 | 5.5 × 3.5 | 84 | detected |
| 9 | 3 | 101289.471(0.010) | 299,20−2810,19 A, (vt = 1) | 498 | 1.8 | 0.04 | – | – | ≲0.12 | ≲0.4 | ≲0.18 | – | – | not detected |
| 10 | 3 | 101302.159(0.010) | 256,19−255,20 A | 219 | 11.1 | 0.04 | 7.6(0.1) | 3.9(0.4) | 3.11 | 12.8(1.0) | 0.95 | 5.0 × 3.5 | 26 | detected |
| 11 | 3 | 101305.506(0.010) | 256,19−255,20 E | 219 | 11.1 | 0.04 | 7.8(0.2) | 3.7(0.4) | 2.65 | 10.4(1.0) | 0.77 | 5.5 × 3.5 | 20 | detected |
| 12 | 3 | 101318.966(0.010) | 133,11−132,12 E, (vt = 1) | 246 | 3.2 | 0.04 | 7.8(0.1) | 3.1(0.3) | 0.70 | 2.3(0.2) | 0.59 | 5.5 × 3.5 | 5 | detected |
| 13 | 3 | 101356.788(0.010) | 152,13−151,14 A, (vt = 1) | 263 | 3.5 | 0.04 | – | – | ≲0.59 | ≲2.1 | ≲0.49 | – | – | blend |
| 14 | 3 | 101370.505(0.010) | 133,11−132,12 E | 60 | 3.2 | 0.04 | 7.9(0.1) | 3.7(0.1) | 3.78 | 14.7(0.1) | 3.78 | 5.0 × 3.5 | 5 | detected |
| 15 | 3 | 101414.746(0.010) | 133,11−132,12 A | 60 | 3.2 | 0.04 | 7.8(0.1) | 3.6(0.1) | 3.73 | 14.3(0.1) | 3.68 | 5.0 × 3.5 | 5 | detected |
| 16 | 3 | 101418.330(0.001) | 53,3−51,4 A, (vt = 1) | 203 | 0.04 | 0.04 | – | – | ≲0.12 | ≲0.4 | ≲7.37 | – | – | not detected |
| 17 | 3 | 101477.421(0.010) | 183,15−183,16 E | 111 | 1.8 | 0.04 | – | – | ≲9.31 | ≲33.2 | ≲15.17 | – | – | blend with H2CS |
| 18 | 3 | 101545.453(0.010) | 183,15−183,16 A | 111 | 1.8 | 0.04 | 7.8(0.1) | 3.6(0.1) | 1.80 | 6.9(0.2) | 3.15 | 5.0 × 3.5 | 5 | detected |
| 19 | 3 | 101626.884(0.010) | 91,9−80,8 E | 25 | 4.1 | 0.04 | – | – | ≲5.96 | ≲21.2 | ≲4.25 | – | – | blend with |
| HCOOCH3-A | ||||||||||||||
| 20 | 3 | 101628.149(0.010) | 91,9−80,8 A | 25 | 4.1 | 0.04 | – | – | ≲5.47 | ≲19.5 | ≲3.91 | – | – | blend with |
| HCOOCH3-E | ||||||||||||||
| 21 | 4 | 105663.117(0.030) | 1913,7−2012,9 E, (vt = 1) | 412 | 0.4 | 0.02 | – | – | ≲0.06 | ≲0.1 | ≲0.20 | – | – | not detected |
| 22 | 4 | 105722.672(0.030) | 104,6−103,8 E, (vt = 1) | 230 | 0.5 | 0.02 | – | – | ≲0.11 | ≲0.2 | ≲0.32 | – | – | blend |
| 23 | 5 | 105810.803(0.030) | 1411,4−1510,6 E | 142 | 0.2 | 0.03 | – | – | ≲0.11 | ≲0.2 | ≲0.79 | – | – | blend |
| 24 | 5 | 105815.953(0.030) | 33,1−22,0 E | 10 | 0.2 | 0.03 | 7.6(0.1) | 2.2(0.2) | 0.39 | 0.9(0.1) | 3.55 | 10.5 × 7.5 | 6 | detected |
| 25 | 5 | 105832.067(0.030) | 1411,3−1510,5 E | 142 | 0.2 | 0.03 | 7.9(0.1) | 1.6(0.2) | 0.20 | 0.4(0.1) | 1.58 | 10.5 × 7.5 | 6 | detected |
| 26 | 6 | 110153.652(0.010) | 101,10−91,9 A, (vt = 1) | 218 | 25.1 | 0.12 | – | – | ≲8.08 | ≲9.7 | ≲0.29 | – | – | blend with NH2D |
| 27 | 7 | 203349.158(0.006) | 2419,5−2518,7 E | 416 | 0.2 | 0.09 | – | – | ≲1.73 | ≲2.8 | ≲5.77 | – | – | blend |
| 28 | 7 | 203378.812(0.007) | 2419,6−2518,8 E | 416 | 0.2 | 0.09 | – | – | ≲5.64 | ≲9.2 | ≲18.94 | – | – | blend |
| 29 | 8 | 203427.575(0.100) | 218,13−217,14 A, (vt = 1) | 366 | 6.2 | 0.09 | 7.9(0.4) | 1.7(0.8) | 1.40 | 2.5(1.0) | 0.17 | 4.5 × 2.5 | 45 | detected |
| 30 | 8 | 203435.554(0.100) | 198,11−197,12 A | 155 | 5.3 | 0.09 | 7.6(0.9) | 1.6(0.9) | 6.40 | 10.6(1.6) | 0.82 | 5.0 × 3.5 | 65 | detected |
| 31 | 8 | 203471.840(0.05) | 198,11−197,12 E | 155 | 4.9 | 0.09 | 7.5(0.1) | 1.6(0.1) | 5.28 | 9.2(2.0) | 0.77 | 5.0 × 3.5 | 40 | detected |
| 32 | 9 | 223435.416(0.001) | 114,8−103,7 A, (vt = 1) | 237 | 1.8 | 0.17 | – | – | ≲3.66 | ≲6.7 | ≲1.38 | – | – | blend |
| 33 | 9 | 223465.340(0.050) | 114,8−103,7 E | 50 | 2.1 | 0.17 | 7.6(0.1) | 2.0(0.2) | 10.74 | 22.5(1.9) | 4.00 | 3.0 × 2.0 | 0 | detected |
| 34 | 9 | 223500.463(0.001) | 114,8−103,7 A | 50 | 1.8 | 0.17 | 7.4(0.1) | 1.8(0.1) | 11.49 | 21.8(1.7) | 4.61 | 3.0 × 1.5 | 0 | detected |
| 35 | 9 | 223534.727(0.100) | 185,14−175,13 E, (vt = 1) | 305 | 41.6 | 0.17 | 7.4(0.1) | 1.7(0.1) | 10.25 | 18.5(0.8) | 0.17 | 3.5 × 2.0 | 0 | detected |
| 36 | 9 | 223538.511(0.100) | 438,35−437,36 E | 618 | 13.9 | 0.17 | – | – | ≲0.51 | ≲0.9 | ≲0.02 | – | – | not detected |
| 37 | 9 | 223592.231(0.100) | 438,35−437,36 A | 618 | 13.9 | 0.17 | – | – | ≲0.91 | ≲1.7 | ≲0.05 | – | – | blend |
| 38 | 9 | 223618.470(0.007) | 279,19−278,19 E, (vt = 1) | 464 | 0.4 | 0.17 | – | – | ≲0.51 | ≲0.9 | ≲0.90 | – | – | not detected |
| 39 | 9 | 223624.496(0.100) | 378,30−377,31 E | 463 | 11.7 | 0.17 | 7.7(0.3) | 1.8(0.6) | 0.68 | 1.3(0.4) | 0.04 | – | – | partial blend |
| 40 | 9 | 223634.916(0.100) | 378,30−377,31 A | 463 | 11.7 | 0.17 | – | – | ≲2.06 | ≲3.8 | ≲0.12 | – | – | blend |
| 41 | 9 | 223642.180(0.001) | 125,7−123,10 E | 63 | 0.1 | 0.17 | – | – | ≲4.08 | ≲7.4 | ≲32.97 | – | – | blend |
| 42 | 9 | 223645.342(0.001) | 125,7−123,10 A | 63 | 0.1 | 0.17 | – | – | ≲1.66 | ≲3.0 | ≲11.23 | – | – | blend |
| 43 | 9 | 223651.592(0.007) | 339,24−338,26 E, (vt = 1) | 573 | 0.7 | 0.17 | – | – | ≲1.35 | ≲2.5 | ≲1.25 | – | – | blend |
| 44 | 9 | 223676.472(0.006) | 357,29−355,30 A, (vt = 1) | 593 | 3.0 | 0.17 | – | – | ≲2.09 | ≲3.8 | ≲0.47 | – | – | blend |
| 45 | 9 | 223782.081(0.007) | 336,28−335,29 E, (vt = 1) | 543 | 7.0 | 0.17 | – | – | ≲0.51 | ≲0.9 | ≲0.05 | – | – | not detected |
| 46 | 9 | 223821.523(0.002) | 357,29−356,30 E | 409 | 8.2 | 0.17 | – | – | ≲2.31 | ≲4.2 | ≲0.19 | – | – | blend |
| 47 | 9 | 223854.201(0.100) | 357,29−356,30 A | 409 | 10.1 | 0.17 | – | – | ≲4.63 | ≲8.4 | ≲0.31 | – | – | blend |
| 48 | 10 | 225689.371(0.008) | 345,29−345,30 A, (vt = 1) | 562 | 3.0 | 0.13 | – | – | ≲12.20 | ≲12.6 | ≲1.57 | – | – | blend |
| 49 | 10 | 225696.842(0.100) | 201,19−191,18 E, (vt = 1) | 307 | 50.2 | 0.13 | – | – | ≲16.8 | ≲17.4 | ≲0.13 | – | – | blend |
| 50 | 10 | 225702.857(0.100) | 192,17−182,16 A, (vt = 1) | 304 | 46.8 | 0.13 | – | – | ≲20.09 | ≲20.8 | ≲0.16 | – | – | blend |
| 51 | 10 | 225727.506(0.100) | 66,1−55,0 A, (vt = 1) | 224 | 3.1 | 0.13 | – | – | ≲4.04 | ≲4.2 | ≲0.50 | – | – | blend |
| 52 | 10 | 225727.506(0.100) | 66,0−55,1 A, (vt = 1) | 224 | 3.1 | 0.13 | – | – | ≲4.04 | ≲4.2 | ≲0.50 | – | – | blend |
| 53 | 11 | 225855.505(0.100) | 66,1−55,1 E | 36 | 3.1 | 0.10 | 7.6(0.1) | 1.2(0.1) | 6.84 | 9.1(0.1) | 1.08 | 5.5 × 4.5 | 5 | detected |
| 54 | 11 | 225900.684(0.100) | 66,0−55,0 E | 36 | 3.1 | 0.10 | – | – | ≲12.74 | ≲13.2 | ≲1.57 | – | – | blend with HDO |
| 55 | 11 | 225928.659(0.100) | 66,0−55,1 A | 36 | 3.1 | 0.10 | – | – | ≲11.42 | ≲11.8 | ≲1.41 | – | – | blend |
| 56 | 11 | 225928.659(0.100) | 66,1−55,0 A | 36 | 3.1 | 0.10 | – | – | ≲11.42 | ≲11.8 | ≲1.41 | – | – | blend |
| 57 | 12 | 225999.145(0.100) | 307,23−298,22 E | 312 | 2.2 | 0.11 | 7.5(0.1) | 0.9(0.3) | 0.70 | 0.6(0.2) | 0.10 | 5.0 × 3.5 | 0 | detected |
| 58 | 12 | 226061.796(0.100) | 203,17−194,16 E, (vt = 1) | 321 | 4.0 | 0.11 | 7.6(0.2) | 1.0(0.5) | 0.72 | 0.8(0.3) | 0.07 | 5.5 × 3.5 | 25 | detected |
| 59 | 12 | 226077.920(0.001) | 103,7−91,8 E | 39 | 0.3 | 0.11 | – | – | ≲2.62 | ≲2.7 | ≲3.53 | – | – | blend |
| 60 | 12 | 226081.175(0.002) | 307,23−298,22 A | 312 | 1.8 | 0.11 | – | – | ≲0.71 | ≲0.7 | ≲0.14 | – | – | blend |
| 61 | 12 | 226087.718(0.007) | 294,26−293,27 A, (vt = 1) | 450 | 4.3 | 0.11 | – | – | ≲0.82 | ≲0.8 | ≲0.07 | – | – | blend |
| 62 | 12 | 226090.301(0.100) | 192,17−182,16 E, (vt = 1) | 303 | 47.0 | 0.11 | – | – | ≲9.62 | ≲9.6 | ≲0.08 | – | – | blend |
| 63 | 12 | 226112.470(0.007) | 294,26−292,27 A, (vt = 1) | 450 | 2.1 | 0.11 | – | – | ≲0.33 | ≲0.3 | ≲0.05 | – | – | not detected |
| 64 | 12 | 226125.600(0.001) | 103,7−91,8 A | 39 | 0.3 | 0.11 | – | – | ≲4.04 | ≲4.2 | ≲5.49 | – | – | blend |
Notes. (1) Observed transitions with Eupper ≲ 650 K. (2) Reference number of the corresponding data set (see Table 1). (3) Frequencies and uncertainties taken from Ilyushin et al. (2009) and from the JPL database (http://spec.jpl.nasa.gov/). (4) Transitions in ground state (vt = 0). Transitions in torsional levels (vt = 1) are specified. (5) Energy of the upper level. (6) Line strength calculated by Ilyushin et al. (2009). For the transitions coming from the JPL database, the line strength is calculated from the formulae of Pickett et al. (1998). (7) Noise estimated from spectrum (1σ). (8) Lines with number 30, 31, 33−35, 41, 53, and 57 are decomposed. Only the first component is given here, other components are given in Table 3, except for lines 29, 39, and 58 because of the blend with the second component. (8)−(11) Velocity, linewidth at half intensity, brightness temperature, and integrated intensities. The uncertainties are estimated with the CLASS software. (12) Column densities of the upper state of the transition with respect to the rotational degeneracy (2Jup + 1). (13) and (14) Source size estimated at half flux density from detected transitions with spatial resolution allowing isolation of the source. (15) Blended lines are specified.
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