Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 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 based on the upper limit set by the present-day unresolved soft
X-ray background. We show that there is no degeneracy between the X-ray
production efficiency and the Lyman-Alpha production efficiency and that the
degeneracy with the ionization fraction of the intergalactic medium can be
broken.

14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys