8-12 juin, 2014


The Evolution of Star-Forming Cores in Molecular Clouds: What we have learned through observations with the JCMT

Doug Johnstone (Joint Astronomy Centre)

James Di Francesco (NRC-Herzberg), Rachel Friesen (DDI), Helen Kirk (NRC Herzberg), Steve Mairs (UVic), Andy Pon (Leeds), Sarah Sadavoy (MPA), and Scott Schnee (NRAO)

I will discuss how twenty-seven years of JCMT observations have provided powerful insight into the physical properties and evolutionary states of star-forming cores within nearby molecular clouds. Thermal dust continuum imaging and molecular line investigations have played important roles in defining the various stages of star-forming cores, diagnosing the mass reservoirs within and around cores, measuring the chemical 'ages' of cores, and determining the strength of the turbulent and ordered velocity fields in which these cores reside. These single-dish observations continue to inform and constrain theoretical studies. I will present specific results by Schnee et al. (2013) that demonstrate the connection between gravitational instability, chemical 'age', and collapse and discuss these results in the context of physical models. The JCMT continues to provide a much needed understanding of the large-scale environmental factors that shape the formation of new stars and their planetary systems. Even as ALMA begins to peer more closely at the collapse of cores to stars and the formation of disks and stellar systems, there remains a critical need for single-dish, large-field investigations.
(doit être confirmé par le SOC)