Submillimetre maps of the edge-on galaxy NGC 891

Broadband continuum images of the edge-on galaxy NGC 891 at 850 μm and 450 μm are presented. These images are very similar to the 1300 μm and CO line images. With respect to the 850 μm continuum, CO is strongest in the socalled molecular ring', and weakest at the largest radii sampled. Inside the molecular ring, the CO/850 μm ratio is somewhat less than in the ring, but higher than in the remainder of the disk. The integrated infrared emission from NGC 891 is dominated by small particles shortwards of 100 μm. Longwards of 100 μm, the emission can be equally well fitted by a single population of large dust grains at 21 K, or a bimodal population of grains at temperatures of 18 K and 27 K. The circumnuclear disk is at a temperature of at least 50 K, and probably much higher.