Dense Core Formation In Converging Turbulent Flows

Details Dense Core Formation In Converging Turbulent Flows Dense Core Formation In Converging Turbulent Flows

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541440g&link_type=abstract

American Astronomical Society, AAS Meeting #215, #414.40; Bulletin of the American Astronomical Society, Vol. 36, p.1113

Astronomy and Astrophysics

Astronomy

Scientific paper

We present results from numerical simulations of dense core formation in converging, turbulent flows within Giant Molecular Clouds (GMCs). The core building and collapse stages which were identified in 1D spherical simulations are again seen even in the non-spherical case. As for the spherical case, the duration of the core building stage is a factor of ten greater than that of core collapse. We also show that the median core mass is proportional to Ma-1, where Ma is the Mach number of the converging flows. This result can also be understood analytically based on gravitational instability in shocked layers. We also show that the cores identified from the gravitational potential of the surface density are comparable to the cores identified in the gravitational potential of the volume density. This offers a new way to identify dense cores in GMCs which does not depend on an arbitrary density threshold.

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