Physical conditions in the gas phases of the giant H II region LMC-N 11 unveiled by Herschel - I. Diffuse [C II] and [O III] emission in LMC-N 11B

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Volume 548 (December 2012)

A&A, 548 (2012) A91

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Table 1

Main parameters of the transitions used in this study.

Line	λ	IP₁^a	IP₂^b	Configuration	n _cr,e ^c	n _cr,H ^d	T _exc
		(eV)	(eV)		( cm^-3)	( cm^-3)	(K)


[O i] ₆₃	63 μm		13.62			≈(4−10) × 10⁵	228
[O i] ₁₄₅	145 μm		13.62			≈(1−20) × 10⁵	327
[C ii]	157 μm	11.26	24.38		≈80	≈3000−5000	91
[O iii] ₅₂	52 μm	35.12	54.93		≈3500		441
[O iii] ₈₈	88 μm	35.12	54.93		≈510		163
[N iii]	57 μm	29.60	47.45		≈3000		251
[N ii] ₁₂₂	122 μm	14.53	29.60		≈400		188
[N ii] ₂₀₅	205 μm	14.53	29.60		≈180		70


[O iii] _opt	5007 Å	35.12	54.93		≈7 × 10⁵		2.9 × 10⁴

Notes.

^(a)

Ionization potential to create the species.

^(b)

Ionization potential to ionize the species.

^(c)

Critical density for collisions with electrons; i.e., the density for which the spontaneous radiation rate equals the collision rate.

^(d)

Critical density for collisions with H i and H₂.

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