Feedback from X-rays and Hard Ionizing Radiation from the First Galaxies

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Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21723103v&link_type=abstract

American Astronomical Society, AAS Meeting #217, #231.03; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

The thermal and ionization history of the intergalactic medium (IGM) strongly affects the visibility of distant galaxies, and interactions with the microwave background. We investigate the joint effects of X-rays and helium-ionizing radiation from the first galaxies and quasars on the topology of reionization in the IGM and its heating history, using the recently updated code GALFORM. X-rays have greater penetrating power relative to UV radiation, and in principle could alter the thermal and ionization balance in the IGM significantly. We find that X-rays may not play a dominant role in high-redshift ionization, contrary to theoretical expectations, and that for sufficiently hard first-light sources, the hydrogen and helium I-fronts could track each other closely. We present the observational signatures from X-ray and hard UV ionization, and ways to distinguish them, particularly through their radio signals.

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