The formation of the open cluster NGC 602 in the Small Magellanic Cloud
  triggered by colliding HI flows
  NGC 602 is an outstanding young open cluster in the Small Magellanic Cloud.
We have analyzed the new HI data taken with the Galactic Australian Square
Kilometre Array Pathfinder survey project at an angular resolution of 30". The
results show that there are three velocity components in the NGC 602 region. We
found that two of them having ~20 km s$^{-1}$ velocity separation show
complementary spatial distribution with a displacement of 147 pc. We present a
scenario that the two clouds collided with each other and triggered the
formation of NGC 602 and eleven O stars. The average time scale of the
collision is estimated to be ~8 Myr, while the collision may have continued
over a few Myr. The red shifted HI cloud extending ~500 pc flows possibly to
the Magellanic Bridge, which was driven by the close encounter with the Large
Magellanic Cloud 200 Myr ago (Fujimoto & Noguchi 1990; Muller & Bekki 2007).
Along with the RMC136 and LHA 120-N 44 regions the present results lend support
for that the galaxy interaction played a role in forming high-mass stars and
clusters.
