Table 8: Total cooling intensities of CO, [C I], [C II], and [O I]. The values in parentheses show the relative contribution to the sum $I_{\rm tot}$. The total cooling efficiency $\epsilon _{\rm tot}$ is defined by $I_{\rm tot}/I_{\rm IR}$. For comparison, we also list the $\epsilon '$defined by $(I_{\rm [C {\sc ii}]}+I_{\rm [O {\sc i}]})/I_{\rm IR}$.
Intensity in [10-4 erg s-1 cm-2 sr-1] DR21 E DR21 C DR21 W DR21 (OH) DR21 FIR1
$I_{\rm CO}({=}\Sigma$ CO $_{1~\le ~J_{\rm u}~\le ~20}$) $^{{\rm {\it a}}}$ 24.1 (28.8%) 51.3 (44.4%) 18.7 (53.7%) 20.0 (75.9%) 13.4 (68.7%)
$I_{[C {\sc i}]}({=}\Sigma$ [C I]) $^{{\rm {\it b}}}$ 0.22 (0.3%) 0.45 (0.4%) 0.23 (0.7%) 0.25 (0.9%) 0.27 (1.4%)
$I_{[O {\sc i}]{}}({=}\Sigma$ [O I]) $^{{\rm {\it b}}}$ 51.1 (61.1%) 55.6 (48.2%) 11.2 (32.1%) 3.78 (14.4%) 2.23 (11.4%)
$I_{[C {\sc ii}]{}}$ 8.2 (9.8%) 8.1 (7.0%) 4.7 (13.5%) 2.3 (8.8%) 3.6 (18.5%)
$I_{\rm tot}$ 83.62 (100%) 115.45 (100%) 34.83 (100%) 26.33 (100%) <19.5 (100%)
$I_{\rm IR}$ $^{{\rm {\it c}}}$ 5500 33900 1810 12700 3680
$\epsilon _{\rm tot}$ [%] 1.5 0.34 1.9 0.21 0.52
$I_{[C {\sc ii}]+[O {\sc i}]}$ ([C II]+[O I] $_{63~\mbox{$\mu$ m}{}}$) 56.4 57.5 14.8 5.24 5.38
$\epsilon '$ [%] 1.0 0.17 0.82 0.04 0.15
$^{{\rm {\it a}}}$For CO we use the best fitting model (Sect. 4.2) and sum over all rotational lines up to J=20. $^{{\rm {\it b}}}$For C I and O I, we sum the observed intensities of both fine structure lines. $^{{\rm {\it c}}}$ $I_{\rm IR}$ is the total observed infrared intensity (Table 5).


Source LaTeX | All tables | In the text