Chemical chronology of the Southern Coalsack

Details Chemical chronology of the Southern Coalsack Chemical chronology of the Southern Coalsack

2007-05-22

arxiv.org/abs/0705.3262v1

Mon.Not.Roy.Astron.Soc.379:807-815,2007

Astronomy and Astrophysics

Astrophysics

10 pages, 4 figures, in press at MNRAS

Scientific paper

10.1111/j.1365-2966.2007.11985.x

We demonstrate how the observed H2O ice column densities toward three dense globules in the Southern Coalsack could be used to constrain the ages of these sources. We derive ages of ~10^5 yr, in agreement with dynamical studies of these objects. We have modelled the chemical evolution of the globules, and show how the molecular abundances are controlled by both the gas density and the initial chemical conditions as the globules formed. Based on our derived ages, we predict the column densities of several species of interest. These predictions should be straightforward to test by performing molecular line observations

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