Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Searching for Early Ionization with the Primeval Structure Telescope   The Primeval Structure Telescope (PaST), will be used search for and study
the era the of the first luminous objects, the epoch of reionization. The first
stars ionized the gas around them producing a pattern of ionization that
reflects the large scale density structure present at the time. The PaST array
will be used in an attempt to sense and study this ionization, by mapping the
brightness of 21-cm neutral hydrogen emission at redshifts from 6 to 25. This
emission disappears on ionization, allowing the study of large scale structure
and of star formation at this very early epoch. The 10,000 antenna PaST array
will be used to image ionized structures by creating 1 million pixel images of
the sky. The angular scales of the images to be produced span from 5
arc-minutes to 10 degrees. The array is currently under construction and over
2000 antennas have been installed.

11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph