Table 1
Properties of the detected lines from molecular ions.
| Species | Transition | ν 0 a | E up | HPBW | rms | V peak | FWHM | T peak | ∫TmbdV |
| (MHz) | (K) | (′′) | (mK) | (km s-1) | (km s-1) | (mK) | (K km s-1) | ||
|
|
|||||||||
| HCO+ | J = 1–0ng | 89 188.52 | 4 | 28 | 1 | 1.1 ± 1.5 | 4.4 ± 1.5 | 1095 ± 1 | 7.40 ± 0.01 |
| J = 3–2ng | 267 557.53 | 26 | 9 | 14 | 1.2 ± 1.5 | 6.0 ± 1.5 | 901 ± 14 | 5.49 ± 0.09 | |
| J = 6–5* | 535 061.38 | 90 | 40 | 7 | 1.6 ± 0.2 | 4.6 ± 0.4 | 76 ± 7 | 0.38 ± 0.03 | |
| J = 7–6* | 624 208.19 | 120 | 34 | 9 | 0.5 ± 0.4 | 3.5 ± 0.8 | 37 ± 9 | 0.14 ± 0.03 | |
| J = 8–7* | 713 342.12 | 154 | 30 | 35 | – | – | – | ≤0.29 | |
| H13CO+ | J = 1–0 | 86 754.29 | 4 | 28 | 2 | 1.2 ± 0.1 | 3.7 ± 0.2 | 39 ± 2 | 0.15 ± 0.00 |
| J = 3–2 | 260 255.34 | 25 | 9 | 7 | 1.6 ± 0.3 | 1.8 ± 0.7 | 23 ± 7 | 0.04 ± 0.01 | |
| J = 4–3 | 346 998.34 | 42 | 7 | 29 | – | – | – | ≤0.16 | |
| N2H+b | J = 1–0 | 93 173.76 | 5 | 26 | 2 | 1.3 ± 0.1 | 4.3 ± 0.2 | 29 ± 2 | 0.33±0.01 |
| J = 3–2 | 279 511.83 | 27 | 9 | 5 | – | – | – | ≤0.03 | |
| HOCO+c | JK-1K1 = 404–303ng | 85 531.51 | 10 | 29 | 1 | 0.9 ± 1.4 | 6.8 ± 1.4 | 8 ± 1 | 0.06 ± 0.01 |
| J K-1 K1 = 505–404ng | 106 913.57 | 15 | 23 | 2 | 1.0 ± 1.1 | 3.3 ± 1.1 | 12 ± 2 | 0.04 ± 0.01 | |
| J K -1 K 1 = 6 06 –5 05 | 128 295.06 | 22 | 19 | 11 | – | – | – | ≤0.07 | |
| SO+d |  ,
J =
5/2–3/2, l = e |
115 804.41 | 9 | 21 | 13 | – | – | – | ≤0.09 |
| ,
J =
5/2–3/2, l = f |
116 179.95 | 9 | 21 | 15 | – | – | – | ≤0.12 | |
| ,
J =
7/2–5/2, l = eng |
162 198.59 | 17 | 15 | 5 | 2.0 ± 1.0 | 2.9 ± 1.0 | 13 ± 5 | 0.09 ± 0.02 | |
| ,
J =
7/2–5/2, l = f |
162 574.06 | 17 | 15 | 7 | 0.6 ± 0.8 | 6.3 ± 1.5 | 17 ± 7 | 0.12 ± 0.03 | |
| ,
J =
9/2–7/2, l = e |
208 590.03 | 27 | 12 | 4 | –0.2 ± 0.6 | 5.7 ± 1.7 | 13 ± 4 | 0.08 ± 0.02 | |
| ,
J =
9/2–7/2, l = f |
208 965.42 | 27 | 12 | 4 | 1.3 ± 0.7 | 5.6 ± 2.0 | 13 ± 4 | 0.08 ± 0.02 | |
| ,
J =
11/2–9/2, l = e |
254 977.94 | 39 | 10 | 5 | – | – | – | ≤ 0.03 | |
| ,
J =
11/2–9/2, l = f |
255 353.23 | 39 | 10 | 5 | – | – | – | ≤ 0.03 | |
| HCS+ | J = 2–1 | 85 347.90 | 6 | 29 | 1 | –0.3 ± 0.8 | 6.2 ± 1.9 | 23 ± 1 | 0.15 ± 0.04 |
| J = 4–3 | 170 691.73 | 21 | 14 | 7 | 0.9 ± 0.3 | 5.6 ± 0.7 | 36 ± 7 | 0.21 ± 0.02 | |
| J = 5–4 | 213 360.53 | 31 | 12 | 4 | 0.0 ± 0.2 | 6.2 ± 0.5 | 38 ± 4 | 0.25 ± 0.02 | |
| J = 6–5 | 256 027.80 | 43 | 10 | 6 | 1.1 ± 0.3 | 6.9 ± 0.7 | 30 ± 6 | 0.22 ± 0.02 | |
| J = 7–6 | 298 690.88 | 57 | 8 | 16 | – | – | – | ≤0.09 | |
Notes. (ng) Non-Gaussian profile. The line intensity is obtained by integrating the area below the profile.
Frequencies are from the JPL molecular database (Pickett et al. 1998), and from the CDMS database (Müller et al. 2001) for N2H+.
The line properties quoted for the N2H+ 1–0 and 3–2 transitions refer to the brightest of their 15 and 45 hyperfine components, i.e. the F1, F = 2, 3–1, 2 and the F1, F = 4,5–3, 4 components, respectively. The line intensity is integrated over all the components.
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