ISOPHOT Maps of NGC6946 in the range 60 - 200 microns
R. J. Tuffs 1 - D. Lemke - C. Xu - J. I. Davies - C. Gabriel - I. Heinrichsen - G. Helou - H. Hippelein - N. Y. Lu - D. Skaley
Abstract:
We present maps of NGC6946 at 
61 and 205 microns as well as scans
through the galaxy at these and at 8 intermediate wavelengths.
The bulk of the
FIR luminosity arises from a diffuse disk component which extends beyond the
25 mag arcsec-2 B isophote to at least the radius corresponding to
the sensitivity limit. A FIR emission counterpart to the outlying HI disk is
seen at both 61 and 205 microns, for which a dust to HI mass ratio
of 0.0046 is inferred from the 205 micron brightness assuming a dust
temperature of 15K. The disk scale length at both
61 and 205 microns is similar to that seen in R-band.
Keywords:
galaxies - star formation - dust