Expanding bubbles in Orion A: [C II] observations of M 42, M 43, and NGC 1977

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Table 6

Comparison of pressure terms in PDRs of the Orion Bar, Veil shell, M 43, and NGC 1977.

p∕k_B	Orion Bar	Veil shell	M 43	NGC 1977
Thermal	3 × 10⁸	1−10 × 10⁵	1 × 10⁶	9 × 10⁵
Magnetic	3 × 10⁷	2 × 10⁶	–	–
Turbulence	3 × 10⁷	0.5−3 × 10⁶	8 × 10⁵	8 × 10⁴
Radiation	1 × 10⁷	1 × 10⁵	3 × 10⁶	8 × 10⁴

Notes. In the Veil shell, higher pressures correspond to the limb-brightened edges, while lower pressures apply to the foreground expanding shell. The radiation pressure is computed from the total luminosity of the central star.

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