``Coherent Cores" as the Sites of Turbulent Stream Collisions

Details ``Coherent Cores" as the Sites of Turbulent Stream Collisions ``Coherent Cores" as the Sites of Turbulent Stream Collisions

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.7120b&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #71.20; Bulletin of the American Astronomical Society, Vol. 30, p.1358

Astronomy and Astrophysics

Astronomy

1

Scientific paper

It has been found recently that small (≲ 0.1 pc) dense cores in molecular clouds show a non-thermal velocity dispersion which is independent of size (Goodman et al 1998). We suggest that, rather than being an indication of velocity coherence, such a flat scaling may be interpreted as the signature of the collision between larger-scal gas streams. This is verified in MHD numerical simulations of the ISM. If the relative velocity difference between the streams is not very large, then the mass-weighted velocity histograms, which are the numerical equivalent of optically thin spectra, show a single spectral component of nearly constant width over a range of scales within the core, as long as the shock site remains unresolved. In this escenario, a core with a size-independent velocity dispersion is not decoupled from its environment, as has been suggested previously. Instead, it is causally and dynamically connected with the external flow.

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