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Table 1

Results for the simultaneous fit of the l-C3H+ line parameters (bottom) and the associated spectroscopic modeling (top).

Order ln(ℒ)a Parameterb Value Unit
Second 2797.9 B 11   244.9474 ± 0.0007 MHz
D 7.652 ± 0.011 kHz
Third 2802.5 B 11   244.9512 ± 0.0015 MHz
D 7.766 ± 0.040 kHz
H 0.56 ± 0.19 Hz
Transition Frequency Resolutions Offsetc RMS noisec Tpeakc Wc SNR Aul Eu gu
   MHz arcsec    kHz    mK    mK    mK    mK   km   s-1    s-1    K
J = 4 → 3 89   957.625 ± 0.004 27.3 49 −0.8 ± 0.5 5.8 ± 0.4 89 77 ± 4 19 3.5 × 10-5 10.8 9
J = 5 → 4 112   445.642 ± 0.005 21.9 49  + 0.2 ± 1.0 13.9 ± 0.7 115 99 ± 7 15 6.8 × 10-5 16.2 11
J = 6 → 5 134   932.733 ± 0.010 18.2 49  + 1.7 ± 1.2 17.6 ± 0.9 72 62 ± 7 10 1.2 × 10-4 22.7 13
J = 7 → 6 157   418.719 ± 0.016 15.6 49  + 1.3 ± 2.1 33.2 ± 1.5 75 65 ± 11 6 1.9 × 10-4 30.2 15
J = 8 → 7 179   903.429 ± 0.024 d – – – – – – 2.9 × 10-4 38.8 17
J = 9 → 8 202   386.678 ± 0.029 12.2 195  + 0.6 ± 1.5 13.1 ± 1.0 62 54 ± 8 7 4.1 × 10-4 48.6 19
J = 10 → 9 224   868.302 ± 0.033 10.9 195  + 1.7 ± 1.7 15.6 ± 1.2 30 26 ± 9 3 5.7 × 10-4 59.4 21
J = 11 → 10 247   348.134 ± 0.046 9.9 195  + 0.0 ± 1.2 11.5 ± 0.8 45 39 ± 6 6 7.6 × 10-4 71.2 23
J = 12 → 11 269   826.003 ± 0.082 9.1 195 −5.3 ± 1.3 12.3 ± 0.9 25 21 ± 7 3 9.9 × 10-4 84.2 25

Notes. 

(a)

ℒ is the fit likelihood.

(b)

Parameters for a linear rotor developed to second and third orders (see Sect. 2).

(c)

Results of the simultaneous Gaussian fits using the third-order model to predict the frequencies. The common line width is 0.81  ±  0.03   km   s-1.

(d)

Outside of the EMIR receiver tuning range.

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