Radiative feedback from ionized gas

Details Radiative feedback from ionized gas Radiative feedback from ionized gas

2007-03-28

arxiv.org/abs/astro-ph/0703716v1

Mon.Not.Roy.Astron.Soc.379:1352-1358,2007

Astronomy and Astrophysics

Astrophysics

8 pages, 2 figures. Accepted by MNRAS

Scientific paper

10.1111/j.1365-2966.2007.11787.x

H2 formation in metal-free gas occurs via the intermediate H- or H2+ ions. Destruction of these ions by photodissociation therefore serves to suppress H2 formation. In this paper, I highlight the fact that several processes that occur in ionized primordial gas produce photons energetic enough to photodissociate H- or H2+ and outline how to compute the photodissociation rates produced by a particular distribution of ionized gas. I also show that there are circumstances of interest, such as during the growth of HII regions around the first stars, in which this previously overlooked form of radiative feedback is of considerable importance.

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