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Event Number 3490

  Thursday, October 2nd, 2014

Astronomy Colloquium
Filaments in simulations of Molecular Cloud FOrmation
Time: 3:30 pm
Place: 4421 Sterling Hall
Speaker: Gilberto Gomez, UNAM Mexico
Abstract: In this talk, we report on the characterization of filaments that develop self-consistently in a numerical simulation of cloud formation by colliding flows. The filaments are not in equilibrium at any time, but instead are long-lived flow features. The filaments are long-lived because they accrete from their environment while simultaneously accreting onto the clumps within them; they are essentially the locus where the flow changes from accreting in two dimensions to accreting in one dimension.

In the simulation, two prominent filaments are formed, with lengths ∼15 pc and masses ∼600Msun above density n ∼ 1e3 cm−3. The density profile exhibits a central flattened core of size ∼0.3 pc and an envelope that decays as r^−2.5 in reasonable agreement with observations. Accretion onto the filament reaches a maximum linear density rate of ∼30Msun Myr^−1 pc^−1.
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