Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Finding a complex polarized signal in wide-band radio data   We present a new algorithm for fitting and classifying polarized radio
sources, which is based on the QU fitting method introduced by O'Sullivan et
al. and on our analysis of pulsars. Then we test this algorithm using Monte
Carlo simulations of observations in the 16 cm band of the Australia Telescope
Compact Array (1.3-3.1 GHz), to quantify how often the algorithm identifies the
correct source model, how certain it is of this identification, and how the
parameters of the injected and fitted models compare. In our analysis we
consider the Akaike and Bayesian Information Criteria, and model averaging. For
the observing setup we simulated, the Bayesian Information Criterion, without
model averaging, is the best way for identifying the correct model and for
estimating its parameters. Sources can only be identified correctly if their
parameters lie inside a 'Goldilocks region': strong depolarization makes it
impossible to detect sources that emit over a wide range in RM, whereas sources
that emit over a narrow range in RM cannot be told apart from simpler sources
or sources that emit at only one RM. We identify when emission at similar RMs
is 'resolved', and quantify this in a way similar to the Rayleigh criterion in
optics. Also, we identify pitfalls in RM synthesis that are avoided by QU
fitting. Finally, we show how channel weights can be tweaked to produce
apodized RM spectra, that observing time requirements in RM synthesis and QU
fitting are the same, and we analyse when to stop RMClean.

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The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: adap-org
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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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The categories of this paper are: stat