HOBYS and W43-HERO: Two more steps toward a Galaxy-wide understanding of high-mass star formation

The Herschel/HOBYS key program allows to statistically study the formation of 10-20 M _⊙ stars. The IRAM/W43-HERO large program is itself dedicated to the much more extreme W43 molecular complex, which forms stars up to 50 M _⊙. Both reveal high-density cloud filaments of several pc³, which are forming clusters of OB-type stars. Given their activity, these so-called mini-starburst cloud ridges could be seen as ``miniature and instant models'' of starburst galaxies. Both surveys also strongly suggest that high-mass prestellar cores do not exist, in agreement with the dynamical formation of cloud ridges. The HOBYS and W43 surveys are necessary steps towards Galaxy-wide studies of high-mass star formation.