Table 1 CO-dark, [CII]-bright gas physical properties

From: Ionized carbon as a tracer of the assembly of interstellar clouds

ICIIa (K km s−1)

FUV field (Go)

Density (cm−3)

Temperature (K)

N(CII)b 1018 (cm−2)

N(H)c 1021 (cm−2)

roughly 5

10

100

100

0.606

3.78

  1. a Average of the C+ line integrated intensity in CO-dark regions. We call [CII]-bright all regions with [CII] emission above the 3σ noise level.
  2. b The C+ column density N(CII) is calculated with equation (1) using the C+ line integrated intensities.
  3. c The total hydrogen column density N(H) = N(HI) + 2N(H2) is estimated from N(CII), applying the abundance C/H = 1.6 × 10−4 (ref. 51).
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