ALMA-IMF - XVII. Census and lifetime of high-mass prestellar cores in 14 massive protoclusters

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Table 4

Prestellar phase lifetime.

	Mass range	⟨n_H₂⟩ ⁽¹⁾	⟨t_ff⟩ ⁽²⁾	t_PSC ⁽³⁾
	(M_⊙)	(×10⁷ cm⁻³)	(kyr)	(kyr)
Constant	8–16	2.0	7.1	240 [190–290]
protostellar	16–30	3.8	5.1	160 [120–200]
envelope	30–55	7.0	3.8	100 [80–120]

Decreasing	8–16	2.0	7.1	120 [90–150]
protostellar	16–30	3.8	5.1	70 [50–90]
envelope	30–55	7.0	3.8	50 [40–60]

Notes. ⁽¹⁾Mean volume density. ⁽²⁾Mean free-fall time per bin. ⁽³⁾Mean prestellar lifetime obtained from the right panels of Figs. 8 and 9. The range corresponds to the uncertainty obtained from the dispersion of the points.

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