Table 2
Results of observations of central positions, deduced from Gaussian fits.
| Cloud |  |
 |
 |
IHCN | VHCN | fwhmHCN | rms |
|---|---|---|---|---|---|---|---|
| (K km s−1) | (km s−1) | (km s−1) | (K km s−1) | (km s−1) | (km s−1) | (mK) | |
| 7 | 0.148 ± 0.015 | −102.89 ± 0.07 | 1.484 ± 0.181 | 0.022 ± 0.018 | −102.92 ± 0.18 | 0.494 ± 0.779 | 17 |
| 14 | 0.133 ± 0.015 | −101.11 ± 0.08 | 1.407 ± 0.178 | 0.023 ± 0.008 | −101.28 ± 0.06 | 0.373 ± 0.135 | 19 |
| 16 | 0.072 ± 0.012 | −99.69 ± 0.09 | 1.161 ± 0.250 | 0.031 ± 0.010 | −99.36 ± 0.09 | 0.615 ± 0.249 | 18 |
| 18 | 0.117 ± 0.013 | −99.40 ± 0.09 | 1.616 ± 0.192 | 0.046 ± 0.010 | −99.87 ± 0.21 | 1.628 ± 0.365 | 12 |
| 30 | 0.100 ± 0.013 | −104.02 ± 0.09 | 1.297 ± 0.181 | 0.058 ± 0.014 | −104.48 ± 0.17 | 1.246 ± 0.245 | 22 |
| 34 | 0.201 ± 0.018 | −107.25 ± 0.09 | 2.221 ± 0.255 | 0.038 ± 0.012 | −107.17 ± 0.18 | 1.143 ± 0.386 | 17 |
| 21 | 0.553 ± 0.018 | −101.10 ± 0.03 | 1.801 ± 0.073 | 0.086 ± 0.012 | −101.20 ± 0.08 | 1.020 ± 0.166 | 19 |
| sum | 2−1 | 0.067 ± 0.006 | −101.35 ± 0.05 | 1.276 ± 0.136 | 3.4 | ||
| sum | 1−1 | 0.038 ± 0.009 | −96.53 ± 0.16 | 1.321 ± 0.402 | 3.4 | ||
| sum | 0−1 | 0.014 ± 0.008 | −108.32 ± 0.24 | 0.827 ± 0.624 | 3.4 | ||
| 56 | 0.319 ± 0.013 | −103.55 ± 0.05 | 2.345 ± 0.107 | 0.126 ± 0.013 | −103.45 ± 0.09 | 1.828 ± 0.239 | 12 |
| sum | 2−1 | 0.096 ± 0.009 | −103.57 ± 0.08 | 1.794 ± 0.189 | 4.3 | ||
| sum | 1−1 | 0.058 ± 0.013 | −98.73 ± 0.19 | 1.744 ± 0.448 | 4.3 | ||
| sum | 0−1 | 0.017 ± 0.011 | −110.70 ± 0.37 | 1.126 ± 0.761 | 4.3 | ||
| 57 | 0.474 ± 0.016 | −102.23 ± 0.03 | 2.013 ± 0.082 | 0.133 ± 0.016 | −102.17 ± 0.09 | 1.463 ± 0.200 | 16 |
| sum | 2−1 | 0.083 ± 0.009 | −102.37 ± 0.10 | 1.799 ± 0.236 | 5.9 | ||
| sum | 1−1 | 0.057 ± 0.012 | −97.38 ± 0.19 | 1.821 ± 0.446 | 5.9 | ||
| sum | 0−1 | 0.027 ± 0.014 | −109.59 ± 0.51 | 1.980 ± 1.116 | 5.9 |
Notes. Intensities are in main beam scale but for HCN are only of the main F = 2 → 1 transition. The spectra for clouds 21, 56, and 57 have been summed (see Fig. 7 and the lines marked “sum” provide the fits to the individual hyperfine components. The expected velocity differences are 4.842 and −7.064 km s−1 with respect to the main (2−1) component. The satellite lines were fit using as initial guess (for the fit algorithm of CLASS) the main line velocity + 4.842 or −7.064 for the 1–1 and 0–1 transitions respectively. That the velocities do not show exactly these differences provides an independent estimate of the uncertainty in the velocity determination. Rms noise levels are in mk converted to main beam scale and per 0.2 km s−1 channel.
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