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Title: Measuring the X-ray background in the reionization era with first generation 21 cm experiments

The X-ray background during the epoch of reionization is currently poorly constrained. We demonstrate that it is possible to use first generation 21 cm experiments to calibrate it. Using the semi-numerical simulation, 21cmFAST, we calculate the dependence of the 21 cm power spectrum on the X-ray background flux. Comparing the signal to the sensitivity of the Murchison Widefield Array (MWA) we find that in the redshift interval z =8-14 the 21 cm signal is detectable for certain values of the X-ray background. We show that there is no degeneracy between the X-ray production efficiency and the Ly╬▒ production efficiency and that the degeneracy with the ionization fraction of the intergalactic medium can be broken.
Authors:
;  [1]
  1. Astronomy Department, Harvard University, 60 Garden Street, Cambridge MA (United States)
Publication Date:
OSTI Identifier:
22282670
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 09; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; COSMOLOGY; ENERGY SPECTRA; IONIZATION; LYMAN LINES; RED SHIFT; SENSITIVITY; X RADIATION