1999A&A...344L..83I

Broadband continuum images of the edge-on galaxy NGC891 at 850µm and 450µm are presented. These images are very similar to the 1300µm and CO line images. With respect to the 850µm continuum, CO is strongest in the socalled molecular ring', and weakest at the largest radii sampled. Inside the molecular ring, the CO/850µm 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 100µm. Longwards of 100µm, the emission can be equally well fitted by a single population of large dust grains at 21K, or a bimodal population of grains at temperatures of 18K and 27K. The circumnuclear disk is at a temperature of at least 50K, and probably much higher.