  We report subarcsecond-resolution VLA and Keck mid-infrared imaging of the
dwarf starburst galaxy II Zw 40. II Zw 40 contains a bright, compact thermal
radio and infrared source with all the characteristics of a collection of dense
HII regions ionized by at least 14,000 O stars. The supernebula is revealed to
be multiple sources within an envelope of weaker emission. The radio emission
is dominated by free-free emission at 2cm, and the spectrum of this emission
appears to be rising. This suggests that the free-free emission is optically
thick at 2cm, and that the individual HII regions are ~1pc in size. This
complex of "supernebulae" dominates the total infrared luminosity of II Zw 40,
although the radio source is less than ~150pc in diameter. Multiple super star
clusters appear to be forming here, the much larger analogues of large Galactic
HII region complexes.

Astrophysics