SIMBAD references

In this paper we report on NH₃ observations towards regions where cores with densities ≥10⁴cm^–3 were expected to exist, in order to verify the conjectured non-correlation between their morphology and their axis of rotation with the magnetic field (Heyer 1998). Among five predicted cores we have detected only one, and this one has different parameters from those predicted. We also mapped in NH₃(1,1), three sources from the sample by Myers & Benson (1983) with higher spatial resolution. In the four cores we detected, of density n≥10⁵cm^–3, there is no obvious relationship between the orientation of the rotation axis, the flattening, and the magnetic field. This non-correlation might indicate that at this density the magnetic field stresses are already dynamically unimportant. However, a statistically significant sample of dense cores has to be studied to establish this conclusion.