Table 2
Summary of o-CH2 observations using the KP 12 m, and Onsala 20 m telescopes toward the Orion pointing positions and their corresponding line parameters.
| Source | αJ2000 | δJ2000 | Line | υsys | υLSR | Δυ | Tmb (a) | rms (b) | S∕N (c) |  (d) |
|---|---|---|---|---|---|---|---|---|---|---|
| [MHz] | [km s−1] | [km s−1] | [km s−1] | [mK] | [mK] | |||||
| KP 12 m telescope | ||||||||||
| Orion-KL | 05:35:14.10 | –05:22:26.54 | 70678.633 | 3.0–6.0 | 13.4(0.6) | 5.2(0.6) | 12.7(3.2) | 6.5 | 2.0 | 4.3 |
| 70679.543 | 9.5(0.6) | 5.2(0.6) | 16.6(4.2) | 6.5 | 2.5 | |||||
| 70680.720 | 4.5(0.6) | 5.2(0.6) | 21.7(5.4) | 6.5 | 3.3 | |||||
| Orion S | 05:35:13.10 | −05:23:56.00 | 70678.633 | 6.5–8 | 12.4(0.4) | 5.2(0.5) | 20.1(3.2) | 7.0 | 2.8 | 6.1 |
| 70679.543 | 8.5(0.4) | 5.2(0.5) | 26.4(4.2) | 7.0 | 3.8 | |||||
| 70680.720 | 3.5(0.4) | 5.2(0.5) | 34.4(5.4) | 7.0 | 4.9 | |||||
| 68371.278 | –13.8(0.4) | 4.9(1.0) | 35.2(9.6) | 7.1 | 5.0 | |||||
| 68375.875 (*) | 7.6(0.4) | 5.2(0.9) | 38.3(8.6) | 7.0 | 5.4 | |||||
| 68380.873 | 28.8(0.4) | 4.8(0.8) | 28.7(7.0) | 7.0 | 4.1 | |||||
| Orion-KL/S | 05:35:07.60 | −05:23:11.00 | 70678.633 | 6–12 | 16.4(0.7) | 3.5(0.5) | 20.1(4.6) | 7.2 | 2.7 | 3.3 |
| 70679.543 | 12.5(0.7) | 3.5(0.5) | 26.4(6.0) | 7.2 | 3.6 | |||||
| 70680.720 | 7.5(0.7) | 3.5(0.5) | 34.4(6.8) | 7.2 | 4.7 | |||||
| Orion RIP | 05:35:15.80 | −05:19:00.50 | 70678.633 | 8–10 | 12.8(0.9) | 3.1(0.7) | 19.9(3.6) | 6.2 | 3.2 | 4.0 |
| 70679.543 | 9.0(0.9) | 3.1(0.7) | 26.1(4.7) | 6.2 | 4.2 | |||||
| 70680.720 | 4.0(0.9) | 3.1(0.7) | 34.0(6.1) | 6.2 | 5.5 | |||||
| Orion Bar | 05:35:22.80 | −05:25:01.00 | 70678.633 | 9–10 | 15.4(0.3) | 2.6(0.6) | 21.1(6.0) | 11.5 | 1.8 | 2.8 |
| 70679.543 | 11.5(0.3) | 2.6(0.6) | 27.7(8.0) | 11.5 | 2.4 | |||||
| 70680.720 | 6.5(0.3) | 2.6(0.6) | 36.1(10.3) | 11.5 | 3.1 | |||||
| 68371.278 | −11.4(0.3) | 2.1(0.5) | 33.1(11.6) | 7.8 | 4.2 | |||||
| 68375.875 (*) | 10.8(0.3) | 2.2(0.5) | 39.4(12.1) | 7.8 | 5.0 | |||||
| 68380.873 | 30.8(0.3) | 2.8(0.5) | 39.5(10.7) | 7.8 | 5.0 | |||||
| OSO 20 m telescope | ||||||||||
| Orion-KL/S (1) | 05:35:16.96 | −05:22:02.7 | 70679.633 | 6–12 | 19.4(1.8) | 4.5(1.2) | 23.8(7.5) | 14.2 | 1.7 | 2.2 |
| 70679.543 | 15.5(1.8) | 4.5(1.2) | 31.3(9.7) | 14.2 | 2.2 | |||||
| 70680.720 | 10.5(1.8) | 4.5(1.2) | 40.8(12.8) | 14.2 | 2.8 | |||||
| Orion-KL/S (6) | 05:35:24.96 | −05:22:32.7 | 70679.633 | 6–12 | 16.3(1.3) | 4.7(0.9) | 23.9(5.1) | 13.8 | 1.7 | 3.1 |
| 70679.543 | 12.5(1.3) | 4.7(0.9) | 31.4(6.6) | 13.8 | 2.3 | |||||
| 70680.720 | 7.5(1.3) | 4.7(0.9) | 40.8(8.8) | 13.8 | 3.0 | |||||
| Orion Bar (2) | 05:35:22.80 | −05:25:01.0 | 70679.633 | 9–10 | 15.4(1.0) | 4.7(1.1) | 28.8(14.6) | 25.3 | 1.1 | 2.3 |
| 70679.543 | 11.5(1.0) | 4.7(1.1) | 37.9(19.1) | 25.3 | 1.5 | |||||
| 70680.720 | 6.5(1.0) | 4.7(1.1) | 49.3(24.7) | 25.3 | 1.9 | |||||
| Orion Bar (5) | 05:35:20.81 | −05:25:17.1 | 70679.633 | 9–10 | 15.4(0.8) | 5.0(1.0) | 28.8(8.4) | 15.0 | 1.9 | 3.8 |
| 70679.543 | 11.5(0.8) | 5.0(1.0) | 37.9(11.4) | 15.0 | 2.5 | |||||
| 70680.720 | 6.5(0.8) | 5.0(1.0) | 49.3(14.5) | 15.0 | 3.3 | |||||
Notes. (a) Peak main-beam brightness temperature derived from the integrated intensity of the detected line features. (b) The rms noise level on the Tmb scale, quoted for a spectral resolution of 0.85 and 0.97 km s−1 for observations made using the KP 12 m, and Onsala 20 m telescopes, respectively. (c) The signal-to-noise ratio (S/N) with respect to the peak line temperature. (d) The S/N of the integrated intensity calculated from the listed rms noise levels and line widths for the 70 GHz CH2 line. (*) Represents the HFS component used to determine the LSR velocity axes of the spectra shown in Fig. 2. For each HFS line, the velocities of the other HFS components are listed as they appear in the spectra shown in this figure. References.For the radial velocities, see Gong et al. (2015) and references therein.
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