| Abstract : | Massive O-type stars (M > 15 Msun) at the end of their lifetimes explode
as supernovae, which are ultimately responsible for enriching heavy
elements to the interstellar medium (ISM) and and the left out extremely
densely packed remnants are believed to form neutron stars and black
holes. Such stars have a significant impact on the evolution of galaxies
and the universe in general through their energetics. However, despite
their importance, the exact formation mechanisms of massive O-type stars
are not fully understood. In recent years, several multi-wavelength
large-scale surveys reveal the common presence of hub-filament systems
(HFSs) in massive star-forming regions. In such HFSs, several parsec-scale
filaments are directed to the central denser regions hosting massive
stars. Hence, the study of massive star formation requires a careful
investigation of the inner environments of the central hub in HFSs. In
this talk, I will present several important observational findings of HFSs
covering large to small spatial scales, which provide new insights into
the formation of the massive O-type stars. It includes the discovery of a
disk-outflow system (extent ~800 AU to 9000 AU) around the rare young
O-type protostar. I will also discuss the implication of the findings to
current theoretical ideas of the most massive star formation. |
