Table 2
Observed spectral-line transitions and observational parameters.
| Transition | ν | Eu/kB | ncrit | HPBW | ηMB | Tsys | PWV | Channel spacinga | tint | rms | |
| [MHz] | [K] | [cm-3] | [′′] | [K] | [mm] | [kHz] | [km s-1] | [min] | [mK] | ||
|
|
|||||||||||
| C17O(2−1) | 224 714.199b | 16.2 | 9.0 × 103 | 27.8 | 0.75 | 255–288 | 0.8–1.4 | 122.07 | 0.16 | 2.9–19.5 | 24–58 |
| N2D+(3−2) | 231 321.912c | 22.2 | 1.7 × 106 | 27.0 | 0.75 | 235–335 | 0.2–3.8 | 122.07 | 0.16 | 11.5–37.5 | 22–35 |
| N2H+(3−2) | 279 511.832c | 26.8 | 2.9 × 106 | 22.3 | 0.74 | 211–359 | 0.04–1.4 | 122.07 | 0.13 | 2.7–5.5 | 32–84 |
| DCO+(4−3) | 288 143.855d | 34.6 | 4.7 × 106 | 21.7 | 0.74 | 170–172 | 0.01–0.5 | 122.07 | 0.13 | 4.1–6.5 | 23–29 |
| H13CO+(4 − 3) | 346 998.344e | 41.6 | 8.2 × 106 | 18.0 | 0.73 | 362–521 | 0.9–1.3 | 122.07 | 0.11 | 8.5–22 | 25–55 |
Notes. Columns (2)–(4) give the rest frequencies of the observed transitions (ν), their upper-state energies (Eu/kB, where kB is the Boltzmann constant), and critical densities. Columns (5)–(12) give the APEX beamsize (HPBW) and the main beam efficiency (ηMB) at the observed frequencies, the SSB system temperatures during the observations (Tsys in TMB scale, see text), the amount of PWV, channel widths (both in kHz and km s-1) of the original data, the on-source integration times per position (tint), and the 1σ rms noise at the smoothed resolution.
The original channel spacings. The final spectra were Hanning-smoothed which divides the number of channels by two.
From Ladd et al. (1998).
From Pagani et al. (2009b).
From the Jet Propulsion Laboratory (JPL; http://spec.jpl.nasa.gov/) spectroscopic database (Pickett et al. 1998).
From the Cologne Database for Molecular Spectroscopy (CDMS; http://www.astro.uni-koeln.de/cdms/catalog) (Müller et al. 2005).
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