  Motivated by recent observations suggesting that core-collapse supernovae may
on average produce ~0.3 M_sun of dust, we explore a simple dust production
scenario which applies to star-forming galaxies in the local environment (the
Magellanic Clouds and possibly the Milky Way) as well as to high redshift (sub-
millimeter, QSO, Lyman break) galaxies. We assume that the net dust destruction
(due to supernova reverse shock, shocks in the interstellar medium, or
astration) is negligible on a timescale of 1 Gyr, in which case the dust mass
can be estimated as 0.004 times the star-formation rate (for a Chabrier IMF)
multiplied by the duration of the star-formation episode. The model can account
for observed dust masses over four orders of magnitude and across the redshift
range 0-8.4, with dust production rates spanning five orders of magnitudes.
This suggests that star-forming galaxies may be seen as maximally dusty, in the
sense that a dominant fraction of the dust-forming elements forged in a
supernova eventually will go into the solid phase. In turn, this indicates
little destruction of supernova dust or almost complete replenishment, on a
short time scale, of any dust that is destroyed.
