H 3 + cooling in primordial gas. S. Glover (A.I.P.) D. W. Savin (Columbia). A brief introduction to galaxy formation. The first protogalaxies form at z ~ 20 - 30 Typical masses ~ 10 6 M , sizes ~ 100 pc Composed of primordial gas: no enrichment by heavy elements:
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S. Glover (A.I.P.)
D. W. Savin (Columbia)
H + e- H- + h
H- + H H2 + e-
~ 10-9 nkT ~ 10-22 n erg s-1 ion-1