8-12 juin, 2014


Synthetic Observations of the Evolution of Starless Cores in a Molecular Cloud Simulation: Comparisons with JCMT Data and Predictions for ALMA

Steve Mairs (University of Victoria)

Doug Johnstone, (National Research Council of Canada - Herzberg Institute of Astrophysics and The Joint Astronomy Centre), Stella S. R. Offner (Yale University), Scott Schnee (National Radio Astronomy Observatory)

Interpreting the nature of starless cores has been a prominent goal in star formation for many years. In order to characterize the evolutionary stages of these objects, we perform synthetic observations of a numerical simulation of a turbulent molecular cloud. We find that nearly all cores that we detect are associated with filaments and eventually form protostars. The final masses of these protostars are not well represented by the initial masses of their parent cores, indicating the significance of mass flow on larger scales. We also find that simulated starless cores that appear Jeans unstable are only marginally larger than their respective Jeans masses (within a factor of three). We note that single dish observations such as those performed with the James Clerk Maxwell Telescope appear to miss significant core structure on small scales because of beam averaging. Finally, we predict that interferometric observations with the Atacama Large Millimeter Array (Cycle 1) will resolve the important small-scale structure, which has so far been missed by millimeter wavelength observations. This research has recently been published in The Astrophysical Journal: Mairs, S; Johnstone, D; Offner, S. S. R.; and Schnee, S. 2014, ApJ 783:60.

Mode de présentation: 2014-06-09 13:45 (doit être confirmé par le SOC)