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Table 4
Fundamental information on different NH3 samples.
| Sources | Reference | Type | NH3 source number |
|---|---|---|---|
| BGPS | Dunham et al. (2011) | High-mass star-forming clumps, at various evolutionary stages | 456 |
| ATLASGAL | Wienen et al. (2012) | High-mass star-forming clumps, at various evolutionary stages | 752 |
| UC Hii Cand | Molinari et al. (1996) | Percursors of ultraconpact HII regions | 163 |
| High contrast IRDCs | Chira et al. (2013) | Capable of harbouring high-mass star-forming regions | 109 |
| Early evolutionary stages | |||
| High IR extinction clouds | Rygl et al. (2010) | Cold and compact high extinction clouds | 54 |
| EGOs | Cyganowski et al. (2013) | Northern extended green objects (EGOs) | 94 |
| Ophiuchus | Friesen et al. (2009) | Studies of isolated starless clumps | 21 |
| Perseus | Schnee et al. (2009) | Starless cores | 49 |
| Cepheus and Orion L1630 / L1641 | Harju et al. (1993, 1991) | Warm, massive clumps | 51 |
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