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On the gravitational content of molecular clouds and their cores
Javier Ballesteros-Paredes, Gilberto C. Gómez, Bárbara Pichardo +1
(Abridged) The gravitational term for clouds and cores entering in the virial theorem is usually assumed to be equal to the gravitational energy, since the contribution to the grav…
The Nature of the Velocity Field in Molecular Clouds. I. The Non-Magnetic Case
Enrique Vazquez-Semadeni, Ricardo F. Gonzalez, Javier Ballesteros-Paredes +2
We present three numerical simulations of randomly driven, isothermal, non-magnetic, self-gravitating turbulence with different rms Mach numbers Ms and physical sizes L, but approx…
Massive Star Forming Regions: Turbulent Support or Global Collapse?
Enrique Vazquez-Semadeni, Javier Ballesteros-Paredes, Ralf S. Klessen +1
We present preliminary numerical evidence that the physical conditions in high-mass star forming regions can arise from global gravitational infall, with the velocity dispersions b…
TMC-1C: an accreting starless core
S. Schnee, P. Caselli, A. Goodman +3
We have mapped the starless core TMC-1C in a variety of molecular lines with the IRAM 30m telescope. High density tracers show clear signs of self-absorption and sub-sonic infall a…
Formation and Collapse of Quiescent Cloud Cores Induced by Dynamic Compressions
Gilberto C. Gómez, Enrique Vázquez-Semadeni, Mohsen Shadmehri +1
(Abridged) We present numerical hydrodynamical simulations of the formation, evolution and gravitational collapse of isothermal molecular cloud cores. A compressive wave is set up…
Statistics of Core Lifetimes in Numerical Simulations of Turbulent, Magnetically Supercritical Molecular Clouds
Roberto Galván-Madrid, Enrique Vázquez-Semadeni, Jongsoo Kim +2
We present measurements of the mean dense core lifetimes in numerical simulations of magnetically supercritical, turbulent, isothermal molecular clouds, in order to compare with ob…