M.J. Sempere 1, J. Cernicharo 1, S.J. Leeks 2, T. Lim 3,4, S. Pérez-Martínez 1, E. González-Alfonso 1, & B. Lefloch 1
1 Consejo Superior de Investigaciones Cientificas. Instituto de Estructura de la Materia. Dpto Fisica Molecular. C/Serrano 121. 28006 Madrid. Spain
2 Queen Mary & Westfield College, London, E1 4NS, U.K.
3 ISO Science Operations Centre, Space Science Department of ESA, Villafranca, P. O. Box 50727, 28080, Madrid, Spain
4 Rutherford Appleton Laboratory
We present LWS-grating and LWS-FP CO maps of the Orion molecular cloud.
Five full LWS-grating rasters, centered on IRc2 and giving a total of
23 positions, have been obtained. For each position of each raster, 6
scans between 43 and 197 
m were performed. The data were reprocessed
to remove non-linear effects using special procedures (see the contribution
of Leeks et al.).
CO lines up to J=20-19 are detected around Orion-IRc2, while in the central position CO lines with higher quantum numbers have been found. The lines of the 13CO isotopic species have also been observed in several directions.
High quality FP data of some CO lines in Orion-IRc2 have been obtained. These lines show broad wings and we present a detailed analysis of the CO emission through the Orion molecular cloud in terms of temperature, column density and H2 volume density.
In addition to the CO lines, several fine structure atomic lines have been detected in all observed positions. A prelimary analysis of these data is presented. Lines from other molecular species are shown and analyzed in the contribution by Cernicharo et al.