Open Access

Table 6.

Assumptions to estimate the fraction of [C II] emission from the cold neutral medium (CNM).

N(H I,PDR) 3.25 × 1020 cm−2
X(C+) 5.9 × 10−5
nCNM 100 cm−3

Notes. N(H I,PDR) is the estimated column density of atomic hydrogen at the surfaces of the PDRs. X(C+) is the fractional abundance of C+, nCNM and TCNM are density and temperature of the CNM.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.