On the photodissociation of H2 by the first stars

Details On the photodissociation of H2 by the first stars On the photodissociation of H2 by the first stars

2000-05-30

arxiv.org/abs/astro-ph/0005576v2

Mon.Not.Roy.Astron.Soc. 321 (2001) 385-397

Astronomy and Astrophysics

Astrophysics

13 pages, 10 figures. Minor revisions to match version accepted by MNRAS

Scientific paper

10.1046/j.1365-8711.2001.03993.x

The first star formation in the universe is expected to take place within small protogalaxies, in which the gas is cooled by molecular hydrogen. However, if massive stars form within these protogalaxies, they may suppress further star formation by photodissociating the H2. We examine the importance of this effect by estimating the timescale on which significant H2 is destroyed. We show that photodissociation is significant in the least massive protogalaxies, but becomes less so as the protogalactic mass increases. We also examine the effects of photodissociation on dense clumps of gas within the protogalaxy. We find that while collapse will be inhibited in low density clumps, denser ones may survive to form stars.

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