The Thermal Evolution of the Postshock Layer in Pregalactic Clouds

Details The Thermal Evolution of the Postshock Layer in Pregalactic Clouds The Thermal Evolution of the Postshock Layer in Pregalactic Clouds

1998-06-13

arxiv.org/abs/astro-ph/9806187v1

Astronomy and Astrophysics

Astrophysics

15pages, tar gzipped, 5 figures, PTP TeX (PTP style files are in http://www2.yukawa.kyoto-u.ac.jp/~ptpwww/ptptex-eng.ptp.html)

Scientific paper

10.1143/PTP.100.63

We re-examine the thermal evolution of the postshock layer in primordial gas clouds. Comparing the time scales, we find that the evolutionary paths of postshock regions in primordial gas clouds can be basically understood in terms of the diagram drawn in the ionization degree vs temperature plane. The results obtained from the diagram are independent of the density in the case that we do not include photodissociation and photoionization. We also argue that the diagram is not only relevant to the case of the steady postshock flow, but also to the isochorically cooling gas.

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