Table 1
Observational properties of W33-Main region as imaged by ALMA-IMF and the principal lines of interest.
| ALMA band | Pointings 7 m 12 m | Mosaic size (″×″) | Θmaj × Θmin(a) (″×″) | Configuration |
|---|---|---|---|---|
| B6 (1.3 mm) | 27 67 | 132 × 132 | 1.1 × 0.7 | TM1;C43-2, 7M |
| B3 (3 mm) | 5 13 | 190 × 180 | 1.4 × 1.2 | TM2; C43-4, TM1; C43-1, 7M (b) |
| B6 spw name | Central frequency (GHz) | Lines | Bandwidth (MHz) | Resolution (MHz) |
| 1 | 217.15 | SiO(5–4) | 234.38 | 0.282 |
| 5 | 230.53 | CO(2–1) | 468.75 | 0.969 |
| 7 | 232.45 | continuum | 1875.00 | 1.129 |
| B3 spw name | Central frequency (GHz) | Lines | Nandwidth (MHz) | Resolution (MHz) |
| 0 | 93.17 | N2H+ (υ = 0, J = (1–0)) | 117.19 | 0.0706 |
| 1 | 92.034 | H41α | 105.454 | 0.564 |
| 1 | 92.076(c) | C41α-He41α | 35.532 | 0.564 |
| 1 | 92.20 | continuum | 937.50 | 0.564 |
| 2 | 102.60 | continuum | 937.50 | 0.564 |
| 3 | 105.00 | continuum 2 | 937.50 | 0.564 |
Notes. (a)Major and minor sizes of the beam at half maximum. Θbeam is the geometrical average of these two quantities. (b)The long- and short-baseline observations are denoted TM1 and TM2, respectively. C43-2, C43-4, C43-1, and 7M refer to the observation time using, respectively, the 12 m (42 antennas) and 7 m (10 antennas) antennas.(c) Value chosen in the middle of He41α and C41α non-spectrally resolved lines, respectively, at 92.07 GHz and 92.08 GHz.
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