All Figures

$\begin{figure} \par\includegraphics[width=14cm,clip]{09851F1.eps}\end{figure}$ Figure 1: Excitation of cyanopolyynes by electrons in diffuse gas. Shown are the integrated optical depths for $J_u \rightarrow { J}_u -1$ transitions as a function of H₂-number density when X(e) = n(e)/n(H₂) $= 4\times 10^{-4}$ . At left are shown results for N(HC₃N) = $10^{12} ~{\rm cm}^{-2}$ and at right for N(HC₅N) = $10^{12}~~{\rm cm}^{-2}$ . For each transition, calculations at T_K = 20, 40, and 60 K are shown but only for lower-J transitions are they clearly separated. In each case the curve for the highest T_K-value lies lowest. The transitions observed in this work are shown as dashed (red) lines.
Open with DEXTER

In the text