Astronomy and Astrophysics – Astronomy
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.6101b&link_type=abstract
American Astronomical Society Meeting 204, #61.01; Bulletin of the American Astronomical Society, Vol. 36, p.768
Astronomy and Astrophysics
Astronomy
Scientific paper
We have calculated the radiation field, dust grain temperatures, and far infrared emissivity of numerical models of turbulent molecular clouds. When compared to a uniform cloud of the same mean optical depth, most of the volume inside the turbulent cloud is brighter, but most of the mass is darker. There is little mean attenuation from center to edge, and clumping causes the radiation field to be somewhat bluer. There is also a large dispersion, typically by a few orders of magnitude, of all quantities relative to their means. However, despite the scatter, the 850μ m emission maps are well correlated with surface density. The fraction of mass as a function of intensity can be reproduced by a simple hierarchical model of density structure.
We have also computed the ionization of the gas by ambient UV radiation and low energy cosmic rays. The reduced radiative field in the dense material where most of the mass resides has implications for chemistry and magnetic field transport.
Bethell Thomas J.
Heitsch Fabian
Mathis John S.
Zweibel Ellen G.
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