  Using XMM data, we study for the first time the X-ray emission of HM1 and
IC2944/2948. Low-mass, pre-main-sequence objects with an age of a few Myr are
detected, as well as a few background or foreground objects. Most massive stars
in both clusters display the usual high-energy properties of that type of
objects, though with log(Lx/Lbol) apparently lower in HM1 than in IC2944/2948.
Compared with studies of other clusters, it seems that a low signal-to-noise
ratio at soft energies, due to the high extinction, may be the main cause of
this difference. In HM1, the two Wolf-Rayet stars show contrasting behaviors:
WR89 is extremely bright, but much softer than WR87. It remains to be seen
whether wind-wind collisions or magnetically confined winds can explain these
emissions. In IC2944/2948, the X-ray sources concentrate around HD101205; a
group of massive stars to the north of this object is isolated, suggesting that
there exist two subclusters in the field-of-view.
