ortho-H_2 and the age of dark clouds and prestellar cores

Details ortho-H_2 and the age of dark clouds and prestellar cores ortho-H_2 and the age of dark clouds and prestellar cores

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.283p&link_type=abstract

The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole

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Scientific paper

Different theories of cloud formation and prestellar core formation exist. Some plead for fast formation via rapid decay of turbulence and minor role of magnetic support, while others defend a slow formation process linked to strong magnetic support and ambipolar diffusion. Measuring the age of the clouds would help to discriminate between the scenarios. Chemical clocks have failed until now to estimate such lifetimes because of the complexity of chemistry and of its unknown initial conditions. Based on a simple and robust subset of the chemical network centred on the ortho/para H_2 ratio, we show that we can give a chemical age to the clouds and to the cores. Applied to the L183 main prestellar core, this model shows that the age of the source is compatible with a fast evolution, not with a slow one.

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