2008

Uncertainties in H2 and HD Chemistry and Cooling and their Role in Early Structure Formation

Glover, S. C. O., Abel, T.

Understand

At low temperatures, the main coolant in primordial gas is molecular hydrogen, H2.

Recent work has shown that primordial gas that is not collapsing gravitationally but is cooling from an initially ionized state forms hydrogen deuteride, HD, in sufficient amounts to cool the gas to the temperature of the cosmic microwave background.
This extra cooling can reduce the characteristic mass for gravitational fragmentation and may cause a shift in the characteristic masses of population III stars.
Motivated by the importance of the atomic and molecular data for the cosmological question, we assess several chemical and radiative processes that have hitherto been neglected: the sensitivity of the low temperature H2 cooling rate to the ratio of ortho-H2 to para-H2, the uncertainty in the low temperature cooling rate of H2 excited by collisions with H, the effects of cooling from H2 excited by collisions with H+ and e-, and the large uncertainties in the rates of several of the reactions responsible for determining the H2 fraction in the gas.

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