ISOPHOT MAPS OF NGC-6946 IN THE RANGE LAMBDA 60-200 MU-M

We present maps of NGC 6946 at lambda 61 and 205 mu m as well as scans through the galaxy at these and at 8 intermediate wavelengths. The bu lk of the FIR luminosity arises from a diffuse disk component which ex tends beyond the 25 mag arcsec(-2) B isophote to at least the radius c orresponding to the sensitivity limit. A FIR emission counterpart to t he outlying HI disk is seen at both 61 and 205 mu m, for which a dust to HI mass ratio of 0.0046 is inferred from the 205 mu m brightness as suming a dust temperature of 15 K. The disk scale length at both lambd a 61 and 205 mu m is similar to that seen in R-band.