The Positive Feedback of Pop III Objects on Galaxy Formation
Abstract
We study the formation of molecular hydrogen in cooling gas behind shocks produced during the blow-away process thought to occur in the first collapsed, luminous (Pop III) objects in the early universe. We find that for a wide range of physical parameters the H2 fraction is f ≈ 6 × 10-3. The H2 mass produced in such explosions can exceed the amount of relic H2 destroyed inside the photodissociation region surrounding a given Pop III. We conclude that these first objects, differently from the suggestion of Haiman et al 1997, might have a net positive feedback on subsequent galactic formation. We discuss the effects of radiation and the implications of our results for the soft-UV background.
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