EPoS Contribution
EPoS Contribution
Understanding How Star Formation Proceeds in the Perseus Molecular Cloud

Doug Johnstone
NRC Canada/Herzberg Institute of Astrophysics, Victoria, Canada
The nearby Perseus molecular cloud is an exceptional laboratory for testing the earliest phases of star formation. Careful consideration of the multi-wavelength surveys of this cloud (in particular 2Mass, Spitzer c2d, and COMPLETE) allows us to measure the column density distribution of the bulk cloud, the location and kinematics of the dense stellar-massed cores, and the distribution of the protostars. As such we can now provide strong constraints for theoretical models or simulations wishing to explain the manner in which stars form within a cloud. Highlights of our results are (1) most of the mass of the cloud is at low column density, (2) dense cores form only in high column density regions, (3) the mass distribution of the dense cores is similar to the IMF, (4) dense cores are mostly thermally supported, (5) dense cores contain only a few percent of the cloud mass, (6) the more concentrated cores are most likely to contain embedded protostars, and (7) the dense cores are not randomly located within the the moledcular cloud, suggesting possible triggering mechanisms for their creation. In this talk, I will discuss each of these important results and place them in context with theoretical models and simulations of star formation.