Radiative feedback from ionized gas

Abstract

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.

8 pages, 2 figures. Accepted by MNRAS

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Cited by in corpus (6)

• Keeping the Universe ionised: Photo-heating and the clumping factor of the high-redshift intergalactic medium
• Accretion onto Seed Black Holes in the First Galaxies
• The First Supernova Explosions: Energetics, Feedback, and Chemical Enrichment
• Feedback from the IR Background in the Early Universe
• ALMA reveals sunburn: CO dissociation around AGB stars in the globular cluster 47 Tucanae
• Relativistic electron impact ionization cross sections of carbon ions and application to an optically thin plasma