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Abstract
The hydrogen negative ion plays a crucial role in the formation of hydrogen molecules in the early universe. Cooling through excitation of H2 drives the formation of the first cosmological objects. The H2 molecules are produced primarily by a reaction sequence initiated by H − . We explore the influence of enhanced photodestruction rates that arise due to absorption by resonance states of H − lying near 11 eV. We examine the feedback effects that occur in radiation fields characteristic of Population III stars, blackbody sources, power-law spectra, and the hydrogen Lyman modulated sawtooth spectra of the high-redshift intergalactic medium.
Highlights
After the formation of the first luminous sources, an ultraviolet (UV) background radiation field was built up as the energetic photons traveled through the surrounding primordial gas
Barkana & Loeb 1999; Bromm & Larson 2004). These photons were produced by the first stars (Population III (Pop III) stars), primordial galaxies, and early miniquasars that formed from halos of gas collapsing under the action of gravitational forces between baryons and dark matter
Cosmology is a precision science and if the observations of the early universe are to yield a comprehensive view of its evolution, an accurate detailed account of the atomic and molecular processes that occurred must be constructed
Summary
After the formation of the first luminous sources, an ultraviolet (UV) background radiation field was built up as the energetic photons traveled through the surrounding primordial gas. H− has two discrete levels: the ground state is 1Se, while the other bound level has 3Pe symmetry whose decay to the ground state is spin forbidden (Bylicki & Bednarz 2000) As such H− has no discrete spectrum, but in the continuum region, H− has a strong series of broad and narrow auto-detaching resonances, for photon energies greater than ∼11 eV (Rau 2002; Stancil et al 2010). In this Letter, we point out that the H− auto-detaching resonances provide an additional contribution to the radiative feedback considered by Chuzhoy et al (2007), which should be included in models of high-redshift halo evolution. We estimate the resonant contribution in three high-redshift scenarios that are relevant to the reionization epoch following the formation of the first stars
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