Molecular abundance ratios as a tracer of accelerated collapse in regions of high mass star formation?

Details Molecular abundance ratios as a tracer of accelerated collapse in regions of high mass star formation? Molecular abundance ratios as a tracer of accelerated collapse in regions of high mass star formation?

2004-10-27

arxiv.org/abs/astro-ph/0410653v1

Astrophys.J. 620 (2005) L795

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures To be published in the Astrophysical Journal

Scientific paper

10.1086/427164

Recent observations suggest that the behaviour of tracer species such as N_2H+ and CS is significantly different in regions of high and low mass star formation. In the latter, N_2H+ is a good tracer of mass, while CS is not. Observations show the reverse to be true in high-mass star formation regions. We use a computational chemical model to show that the abundances of these and other species may be significantly altered by a period of accelerated collapse in high mass star forming regions. We suggest these results provide a potential explanation of the observations, and make predictions for the behaviour of other species.

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