Feedback from first radiation sources: H- photodissociation

Abstract

During the epoch of reionization, the formation of radiation sources is accompanied by the growth of a H- photodissociating flux. We estimate the impact of this flux on the formation of molecular hydrogen and cooling in the first galaxies, assuming different types of radiation sources (e.g. Pop II and Pop III stars, miniquasars). We find that H- photodissociation reduces the formation of H2 molecules by a factor of ~1+1000k_s*x/(f_esc*delta), where x is the mean ionized fraction in the IGM, f_esc is the fraction of ionizing photons that escape from their progenitor halos, delta is the local gas overdensity and k_s is an order unity constant which depends on the type of radiation source. By the time a significant fraction of the universe becomes ionized, H- photodissociation may significantly reduce the H2 abundance and, with it, the primordial star formation rate, delaying the progress of reionization.

4 pages, 2 figures

References in corpus (8)

• On the properties of massive Population III stars and metal-free stellar populations
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• The Radiative Feedback of the First Cosmological Objects
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• The Growth of the Stellar Seeds of Supermassive Black Holes
• The brief era of direct collapse black hole formation
• Neutral gas heating by X-rays in primitive galaxies: Infrared observations of IZw18 with Herschel
• Feedback from the IR Background in the Early Universe
• Modelling the cosmological Lyman-Werner background radiation field in the Early Universe
• From dark matter halos to pre-stellar cores: High resolution follow-up of cosmological Lyman-Werner simulations
• Baryon-Dark matter interaction in presence of magnetic fields in light of EDGES signal
• Enhanced direct collapse due to Lyman alpha feedback
• Upper Limit on Star Formation and Metal Enrichment in Minihalos