Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing First Galaxies and Their Impact on the Intergalactic Medium
  through the 21-cm Observation of the Cosmic Dawn with the SKA   We present an overview of the theory of high-redshift star and X-ray source
formation, and how they affect the 21-cm background. Primary focus is given to
Lyman alpha pumping and X-ray heating mechanisms at cosmic dawn, opening a new
observational window for high-redshift astrophysics by generating sizable
fluctuations in the 21-cm background. We describe observational prospects for
power spectrum analysis and 3D tomography (imaging) of the signature of these
early astrophysical sources by SKA1-LOW and SKA2.

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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg