Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Four Fundamental Foreground Power Spectrum Shapes for 21 cm Cosmology
  Observations   Contamination from instrumental effects interacting with bright astrophysical
sources is the primary impediment to measuring Epoch of Reionization and BAO 21
cm power spectra---an effect called mode-mixing. In this paper we identify four
fundamental power spectrum shapes produced by mode-mixing that will affect all
upcoming observations. We are able, for the first time, to explain the
wedge-like structure seen in advanced simulations and to forecast the shape of
an 'EoR window' that is mostly free of contamination. Understanding the origins
of these contaminations also enables us to identify calibration and foreground
subtraction errors below the imaging limit, providing a powerful new tool for
precision observations.

24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat