ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions – XI. From inflow to infall in hub-filament systems

Observations of Infall in Star-forming Regions

Outflow and Infall in a Sample of Massive Star Forming Regions II: Large Scale Kinematics

We present maps of seven sources selected from Klaassen & Wilson (2007a) in SiO (J=8-7) and HCO and HCO (J=4-3) which were obtained using HARPB on the James Clerk Maxwell Telescope. We find that four out of our seven sources have infall signatures based on their HCO emission profiles. From our maps, we have determined the extent of both the outflowing and infalling regions towards these sources...

Massive Star Forming Regions: from diagnostic tools to derived properties

The current state-of-the-art of multi-wavelength diagnostic tools (evolutionary synthesis, photoionisation models) for massive star forming regions (Hii regions, starbursts, etc.) and some of their input physics (especially model atmospheres) is reviewed. Analysis of stellar populations based on integrated spectra from both stellar features and nebular emission lines from the UV to IR are summa...

Magnetic Fields in Massive Star Forming Regions

We present the largest sample of high-mass star-forming regions observed using submillimetre imaging polarimetry. The data were taken using SCUBA in conjunction with the polarimeter on the JCMT in Hawaii. In total, 16 star forming regions were observed, although some of these contain multiple cores. The polarimetry implies a variety of magnetic field morphologies, with some very ordered fields....

Indications of Inflow Motions in Regions Forming Massive Stars

Observational evidence for inflowing motions in massive star forming regions has been extremely rare. We have made a spectroscopic survey of a sample of 28 massive star forming cores associated with water masers. An optically thick line of HCN 3−2 was used in combination with optically thin lines (HCN 3−2 or CS 5−4, 3−2, and 2−1 ), to identify “blue” line profiles that can indicate inflow. Comp...