Detection of a large fraction of atomic gas not associated with star-forming material in M17 SW

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Table 1

Fraction of average [C II] emission in the three gas phases.

Model No.	H II fraction	H I fraction	H₂ fraction

Model 1^a	42.7%	20.9%	36.4%
Model 2^b	36.2%	16.8%	47.0%
Model 3^c	36.8%	17.4%	45.8%

Notes.

^(a)

Combination: [CII] − {τ(HI) + [CI] _{609 μm} + C¹⁸O (2−1) } ;

^(b)

Combination: [CII] − {τ(HI) + [CI] _{609 μm} + ¹²CO (1−0) };

^(c)

Combination: [CII] − {τ(HI) + ¹²CO (1-0) + C¹⁸O (2−1) } .

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