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Table 4

Overall Galactic [C ii] emission fractions in different gas components in the inner Galaxy RG<R, integrated over the inner Galactic disk, including the z-scales.

ISM Gas component [C ii] intensity fraction1

2[C ii] fraction in dense H2 48%
2[C ii] fraction in (CO-faint) diffuse H2 14%
3[C ii] fraction in diffuse H i and WIM 41%
[C ii] fraction in diffuse H i 10.5%
[C ii] fraction in WIM 30.5%



Includes only [C ii] intensities above GOT C+ detection limit.


Ignoring the emission from H i layers in the H2 clouds.


Does not include emissions below GOT C+ detection limit.

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