A fresh view on Henize 2-10 with VLT/NAOS-CONICA

Abstract

We present high-resolution observations of Henize 2-10 in Ks (2.2um), L' (3.8um), M' (4.8um) bands. These allow for the first time to track accurately the structures at the heart of the galaxy from the optical to the radio. All radio knots previously observed can now be associated with L' and Ks emitting regions. This implies a revision of their physical nature. Instead of highly extinguished ultra-dense HII regions, we propose that two of the 5 radio knots are either supernova remnants or "normal" HII regions, while the remaining three are bona fide ultra-dense HII regions, although less obscured than was previously thought.