Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-07-24
Astrophys.J.633:L113-L116,2005
Astronomy and Astrophysics
Astrophysics
4 pages, 5 figures, resubmitted to ApJL
Scientific paper
10.1086/498413
Molecular clouds (MCs) are highly structured and ``turbulent''. Colliding gas streams of atomic hydrogen have been suggested as a possible source of MCs, imprinting the filamentary structure as a consequence of dynamical and thermal instabilities. We present a 2D numerical analysis of MC formation via converging HI flows. Even with modest flow speeds and completely uniform inflows, non-linear density perturbations as possible precursors of MCs arise. Thus, we suggest that MCs are inevitably formed with substantial structure, e.g., strong density and velocity fluctuations, which provide the initial conditions for subsequent gravitational collapse and star formation in a variety of galactic and extragalactic environments.
Burkert Andreas
Devriendt Julien E. G.
Hartmann Lee
Heitsch Fabian
Slyz Adrianne D.
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