157 micron [CII] emission from NGC 2024: core and halo components

We have mapped portions of the nebula NGC 2024 in the 157 μm [CII] line and find both a compact component centered on the radio-recombination line regions, and a more extended nebulosity. The central component emits 157 μm line and continuum fluxes at a level of 4 x 10-16 W cm-2 and 5 x 10-16 W cm-2 μm-1, respectively, both somewhat lower than values reported earlier by Russell et al. but well within the errors of the earlier measurements. The continuum emission drops off more rapidly with distance from the peak, but line emission still is at approx.30% of the peak value at a distance 18' to the SE of the peak. In related observations carried out on M42, we confirmed our earlier measurements of the 157 μm line and continuum fluxes, but made no attempt to search for an extended halo