Table 1
Molecular lines mapped in the M8 E region.
| Species/Line | ν | Eup | θ | ∫ TMBdv (peak) | vLSR | rms | ncrit (a) | Size |
|---|---|---|---|---|---|---|---|---|
| (GHz) | (K) | (′′) | (K km s−1) | (km s−1) | (K km s−1) | (cm−3) | (′′ ×′′) | |
| 12CO (1 → 0) | 115.2712 | 5.5 | 22.5 | 440.2 | 10.5 | 0.71 | 2.2 × 103 | 260 × 260 |
| 13CO (1 → 0) | 110.2013 | 5.3 | 23.5 | 86.9 | 9.9 | 0.33 | 1.9 × 103 | 260 × 260 |
| N2H+ (1 → 0) | 93.1733 | 4.5 | 27.8 | 20.3 | 10.7 | 0.21 | 3.7 × 105 | 260 × 260 |
| HCN (1 → 0) | 88.6316 | 4.3 | 29.3 | 77.7 | 10.6 | 0.17 | 1 × 106 | 160 × 160 |
| H13CN (1 → 0) | 86.3399 | 4.1 | 30.0 | 9.0 | 10.8 | 0.12 | 160 × 160 | |
| HCO+ (1 → 0) | 89.1885 | 4.3 | 29.1 | 42.6 | 10.8 | 0.21 | 1.9 × 105 | 160 × 160 |
| H13CO+ (1 → 0) | 86.7542 | 4.2 | 30.0 | 3.8 | 10.7 | 0.16 | 1.8 × 105 | 160 × 160 |
| HNC (1 → 0) | 90.6635 | 4.4 | 28.6 | 25.4 | 10.8 | 0.21 | 3.2 × 105 | 160 × 160 |
| HN13C (1 → 0) | 87.0908 | 4.2 | 30.0 | 1.9 | 10.8 | 0.17 | 160 × 160 |
Notes. Columns are from left to right the species/line, frequency, upper level energy, FWHM beam size, peak-integrated flux density in the map, centroid LSR velocity, rms noise, critical density for optically thin emission, and map size. The measured line parameters (flux, centroid LSR velocity, and rms) are for the central position, which corresponds to that of M8E-IR and is given in Sect. 2. (a) Critical densities calculated for species whose collisional rate coefficients are provided by LAMDA. For 12CO and 13CO, the coefficients are determined at 80 K and for N2 H+, HCN, HCO+, H13CO+, and HNC, the coefficients are determined at 30 K.
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