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First Stars III
Contact:
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Poster
Title: Fluctuating Hydrogen Molecule Dissociating Background During Cosmic Reionization Author(s): Kyungjihn Ahn Abstract: First Pop III stars are believed to form inside minihalos (T<10^4 K) with the help of hydrogen molecule (H_2) cooling. H_2, however, is easily dissociated by H_2 Lyman-Werner band photons, which can originate from sources in cosmological distance. We calculate the build-up of this H_2 dissociating background during the epoch of reionization, based upon the recent cosmic reionization simulation results. We show that (1) H_2 dissociating background builds up long before the end of cosmic reionization and (2) due to the clustering of sources of reionization, the resultant background shows a significant spatial fluctuation. This would lead to a spatial variation of the formation of Pop III objects. The observational perspective (e.g. JWST observation) of our result is also presented.
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