Table 1
Transitions, their parameters, and spectral window parameters.
| Molecule | Transition | v (a) (MHz) | Eup (a) (K) | Sijµ2 (a) (D2) | ncr(b) (104 cm−3) | dV (km s−1) | Beam (PA) (″ × ″, °) | Chan. rms (mJy beam−1) |
|---|---|---|---|---|---|---|---|---|
| HC3N | 24 – 23 | 218 324.72 | 131 | 334.2 | 8.3 | 0.5 (c) | 0.52 × 0.29 (−69) | 5.4 |
| CH3OH | 4−2,3 − 3−1,2 E | 218440.06 | 45 | 13.9 | 2.2 | 0.17 | 0.55 × 0.29 (−73) | 5.5 |
| 42,3 − 51,4 A | 234683.37 | 61 | 4.5 | 0.5 | 0.16 | 0.49 × 0.27 (−71) | 5.8 | |
| 51,4 − 41,3 A | 243 915.78 | 50 | 15.5 | 1.9 | 0.15 | 0.27 × 0.22 (−95) | 4.7 | |
| C18O | 2 − 1 | 219 560.35 | 16 | 0.02 | 0.5 | 0.17 | 0.53 × 0.29 (−71) | 5.0 |
| CS | 5 − 4 | 244935.56 | 35 | 19.1 | 130 | 0.15 | 0.33 × 0.27 (−68) | 3.7 |
| CH3CN | 141 − 131 | 257 522.42 | 100 | 295.2 | 9.3 | 0.42 (c) | 0.31 × 0.26 (−71) | 2.8 |
| 140 − 130 | 257 527.38 | 93 | 296.7 | 10.2 | ||||
| H13CN (d) | J = 3−2, F = 4−3 | 259 011.86 | 25 | 34.4 | 410 | 0.45 (d) | 0.33 × 0.27 (−68) | 2.1 |
| SiO | 6−5 | 260 518.02 | 44 | 57.6 | 50 | 0.42 (c) | 0.30 × 0.26 (−73) | 2.5 |
| CCH (d) | N = 3−2, J = 5/2−3/2, F = 3−2 | 262064.99 | 25 | 4.3 | 6.5 | 0.42 (c) | 0.30 × 0.26 (−73) | 2.5 |
Notes. (a) Frequencies and spectroscopic parameters have been extracted from the CDMS catalogue (Müller et al. 2001, 2005). (b) The critical densities of CS and H13CN were obtained from Shirley (2015) at 50 K, and those of the other tracers were estimated at 50 K using the LAMDA database (Schöier et al. 2005). (c) The spectral channels of these spws were smoothed by a factor of 3 to gain in signal-to-noise ratio. (d) H13CN and CCH consist of two hyperfine components in 0.4 MHz interval. Those with the higher Sijµ2 are reported here.
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