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Table 4

Physical parameters of the two cores in the southern part of Oph D.

Core Mmodela Mobsb Mvir Tkinc ncd Etherm/|Egrav|e Erot/|Egrav Eturb/|Egrav Pext/kBf
[M] [M] [M] [K] [106 cm-3] [K cm-3]

Northern 0.045 0.21 0.29 8.8 0.2 3.89 (0.497) 0.077 0.045 2.0 × 106
Southern 0.16 0.17 0.21 6.1 4.0 0.75 (0.413) 1.23 × 10-3 1.0 × 10-2 9.1 × 106



The mass of the modified Bonnor-Ebert sphere used to model the core.


The mass of the core derived from the observation with the aid of the model. The projection area of the core and the column density of ammonia within that area were taken from the observation. In order to calculate the mass, a value for the fractional abundance of ammonia was taken from the model (modified BE sphere). The average values of abundance over the projected area of the model were estimated to be X(NH3) = 1.8  ×  10-8 for the northern and X(NH3) = 5  ×  10-9 for the southern core.


The kinetic temperature at the centre of the core model.


The number density at the centre of the core model.


Ratio of thermal energy to gravitational potential energy using the core model mass Mmodel, and in parenthesis using Mobs.


The external pressure, when using the core mass derived from observation (Mobs = 0.21   M), is Pext/kB = 9.9  ×  106 K cm-3.

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