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$\begin{figure} \par\includegraphics[angle=-90,width=14.cm,clip]{5855fig1.eps} \end{figure}$ Figure 1: View of the DR21/DR21 (OH) high-mass star-forming region. Left: overlay of the KOSMA ¹³CO 3-2 map (cf. Schneider et al. 2006/SBS2006) in contours on a Spitzer IRAC 8 $\mu$ m greyscale map (Marston et al. 2004). Contours are on a $T_{\rm mb}$ scale and range from 16.8 to 100.8 in steps of 16.8 ${\rm K}~{\rm km}~{\rm s}^{-1}$ ( $\sigma=5.6~{\rm K}~{\rm km}~{\rm s}^{-1}$ ). The integration interval is -10 to $20~~{\rm km}~{\rm s}^{-1}$ . The left-top circle indicates the HPBW of KOSMA. The map also shows 6 positions of radio continuum sources identified as OB stars by Roelfsema et al. (1989) (white crosses), 2 infrared sources and maser positions (Garden et al. 1986) (small white circles), and 8 compact 1.3-mm dust emission sources (Chandler et al. 1993) (open rectangles). Right: overlay of the Spitzer map at 4.5 $\mu$ m with contours of the KOSMA ¹²CO 3-2 map (integration interval of -20 to $30~~{\rm km}~{\rm s}^{-1}$ ; discussed in SBS2006) ranging from 18 to 450 in steps of 48 ${\rm K}~{\rm km}~{\rm s}^{-1}$ ( $\sigma=6~{\rm K}~{\rm km}~{\rm s}^{-1}$ ). The labeled circles mark the positions and beam sizes of the ISO/LWS observations that we used to constrain the physical parameters as discussed in the text. The LWS beam is comparable to the resolution of the KOSMA maps.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=7.7cm,clip]{5855fig2.eps}\hspace*{6mm} \includegraphics[angle=-90,width=7.7cm,clip]{5855fig3.eps} \end{figure}$ Figure 2: Integrated intensity map of CO 4-3 ( left) and CO 7-6 ( right) of DR21 and DR21 (OH). The integration interval is -20 to 30 $~{\rm km}~{\rm s}^{-1}$ . The contours for CO 4-3 run from 66( $3\sigma$ ) to 462 $~{\rm K}~{\rm km}~{\rm s}^{-1}$ in steps of $3\sigma$ , and from 68( $2\sigma$ ) to 671 $~{\rm K}~{\rm km}~{\rm s}^{-1}$ in steps of $2\sigma$ for CO 7-6. The HPBW is indicated in the upper left corner. The positions of ISO/LWS observations (cf. Fig. 1) are indicated by circles. The dashed white lines correspond to the cuts shown in Fig. 6.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=7.7cm,clip]{5855fig4.eps}\hspace*{6mm} \includegraphics[angle=-90,width=7.7cm,clip]{5855fig5.eps} \end{figure}$ Figure 3: Integrated intensity map of [C I] 1-0 ( left) and of [C I] 2-1 ( right). The integration interval is -10 to 20 $~{\rm km}~{\rm s}^{-1}$ . The contours for C I 1-0 run from 12( $2\sigma$ ) to 60 $~{\rm K}~{\rm km}~{\rm s}^{-1}$ in steps of $2\sigma$ , and from 20( $1\sigma$ ) to 108 $~{\rm K}~{\rm km}~{\rm s}^{-1}$ in steps of $\sigma$ for [C I] 2-1.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=7.5cm,clip]{5855fig6.eps} \end{figure}$ Figure 4: Integrated intensity map of CS 7-6. The integration interval is -10 to 4 $~{\rm km}~{\rm s}^{-1}$ . Contours run from 1.8( $3\sigma$ ) to 13.0 $~{\rm K}~{\rm km}~{\rm s}^{-1}$ (in steps of $3\sigma$ ).
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=3.75cm,clip]{5855fig7.eps}\h... ...e*{0.3mm} \includegraphics[angle=-90,width=3.2cm,clip]{5855figb.eps}\end{figure}$ Figure 5: Spectra of all observed species at the five ISO positions. Grey filled spectra outlined in black: observed lines; thin grey lines: line profiles modeled with the radiative transfer code S IML INE (see Sect. 4.2). All spectra are shown at a common spatial resolution of 80'' and on a $T_{\rm mb}$ scale. The baselines are shifted in steps of 30 K. [C I] was multiplied by a factor of 2, and CS 7-6 and C¹⁸O 1-0 by a factor of 4. The J=1-0 transition data are FCRAO observations. The dashed lines indicate the central velocity of $-3~~{\rm km}~{\rm s}^{-1}$ , and the dotted lines the secondary velocity component at about $9~~{\rm km}~{\rm s}^{-1}$ , which was excluded from the fitting.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=7.8cm,clip]{5855figc.eps}\end{figure}$ Figure 6: Cut along the DR21 outflow axis (top) and along the ridge (bottom) centred on DR21 C in the CO 3-2, 4-3, and 7-6 integrated emission. The 80 $^{\prime \prime }$ resolution is indicated as a horizontal line. The dashed vertical lines indicate the positions of the ISO/LWS observations.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=8cm,clip]{5855figd.eps}\par\... ...e*{7.6mm}\includegraphics[angle=-90,width=7.25cm,clip]{5855fige.eps}\end{figure}$ Figure 7: ISO/LWS Spectral Energy Distribution (SED) of the DR21 region (upper panel), and the DR21 (OH) and DR21 FIR1 region (lower panel). Curves indicate the best greybody fit corresponding to the values given in Table 5.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=3.7cm,clip]{5855figf.eps}\hs... ...*{-0.8mm} \includegraphics[angle=-90,width=3.1cm,clip]{5855figj.eps}\end{figure}$ Figure 8: Cooling curves of the best-fit model line fluxes (marked by open symbols) of CO, ¹³CO, and C¹⁸O. Observed line intensities are indicated as filled symbols (see Table 3). At position DR21 C, we included two observations by Boreiko & Betz (1991) of CO and ¹³CO J=9-8. Since the ¹³CO 6-5 map does not cover the postitions DR21 (OH) and DR21 FIR1 on a fully sampled grid, we expect a larger error. The high-J CO emission at DR21 FIR1 are upper limits.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=7.8cm,clip]{5855figk.eps} \end{figure}$ Figure B.1: OTF map of the ¹³CO 2-1 emission (SBS2006). An emission-free position is indicated by the triangle on the right and was used as OFF position for the OTF observations. The box indicates the map size of the DBS-mode observations in Figs. 2 and 3. The circle in the top left corner indicates the 120'' beam size. The smaller circles labeled ON1&ON2, OFF1, and OFF2 show an examplary DBS measurement (cf. Fig. B.2) with a field rotation angle $\alpha =10^{\circ }$ .

In the text

$\begin{figure} \par\includegraphics[angle=-90,width=6cm,clip]{5855figl.eps} \end{figure}$ Figure B.2: The method of correcting self-chopping in dual-beam-switch observing mode. The uppermost spectrum a) shows a standard DBS spectrum of C I 1-0 with a self-chopped absorption line (ON-0.5(OFF1+OFF2)), and b) shows the difference signal (OFF2-OFF1). In the middle, c) and d), both beams of the DBS spectrum are displayed (Beam 1 or ON1-OFF1, and resp. for Beam 2). The result e) (after removing standing waves) shows a faint emission line.

In the text

$\begin{figure} \par\includegraphics[angle=-90,width=7.7cm,clip]{5855fig4.eps}\hspace*{6mm} \includegraphics[angle=-90,width=7.7cm,clip]{5855fig5.eps} \end{figure}$	Figure 3: Integrated intensity map of [C I] 1-0 ( left) and of [C I] 2-1 ( right). The integration interval is -10 to 20 $~{\rm km}~{\rm s}^{-1}$ . The contours for C I 1-0 run from 12( $2\sigma$ ) to 60 $~{\rm K}~{\rm km}~{\rm s}^{-1}$ in steps of $2\sigma$ , and from 20( $1\sigma$ ) to 108 $~{\rm K}~{\rm km}~{\rm s}^{-1}$ in steps of $\sigma$ for [C I] 2-1.
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$\begin{figure} \par\includegraphics[angle=-90,width=7.5cm,clip]{5855fig6.eps} \end{figure}$	Figure 4: Integrated intensity map of CS 7-6. The integration interval is -10 to 4 $~{\rm km}~{\rm s}^{-1}$ . Contours run from 1.8( $3\sigma$ ) to 13.0 $~{\rm K}~{\rm km}~{\rm s}^{-1}$ (in steps of $3\sigma$ ).
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$\begin{figure} \par\includegraphics[angle=-90,width=7.8cm,clip]{5855figc.eps}\end{figure}$	Figure 6: Cut along the DR21 outflow axis (top) and along the ridge (bottom) centred on DR21 C in the CO 3-2, 4-3, and 7-6 integrated emission. The 80 $^{\prime \prime }$ resolution is indicated as a horizontal line. The dashed vertical lines indicate the positions of the ISO/LWS observations.
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$\begin{figure} \par\includegraphics[angle=-90,width=8cm,clip]{5855figd.eps}\par\... ...e*{7.6mm}\includegraphics[angle=-90,width=7.25cm,clip]{5855fige.eps}\end{figure}$	Figure 7: ISO/LWS Spectral Energy Distribution (SED) of the DR21 region (upper panel), and the DR21 (OH) and DR21 FIR1 region (lower panel). Curves indicate the best greybody fit corresponding to the values given in Table 5.
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