Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: NH$_{3}$ (1,1) hyperfine intensity anomalies in the Orion A molecular
  cloud   In LTE, the two inner satellite lines (ISLs) and the two outer satellite
lines (OSLs) of the NH$_{3}$ (1,1) transition are each predicted to have equal
intensities. However, hyperfine intensity anomalies (HIAs) are observed to be
omnipresent in star formation regions, which is still not fully understood. In
addressing this issue, we find that the computation method of the HIA by the
ratio of the peak intensities may have defects, especially when being used to
process the spectra with low velocity dispersions. Therefore we define the
integrated HIAs of the ISLs (HIA$_{\rm IS}$) and OSLs (HIA$_{\rm OS}$) by the
ratio of their redshifted to blueshifted integrated intensities and develop a
procedure to calculate them. Based on this procedure, we present a systematic
study of the integrated HIAs in the northern part of the Orion A MC. We find
that integrated HIA$_{\rm IS}$ and HIA$_{\rm OS}$ are commonly present in the
Orion A MC and no clear distinction is found at different locations of the MC.
The medians of the integrated HIA$_{\rm IS}$ and HIA$_{\rm OS}$ are
0.921$\pm$0.003 and 1.422$\pm$0.009, respectively, which is consistent with the
HIA core model and inconsistent with the CE model. Selecting those 170
positions where both integrated HIAs deviate by more than 3-$\sigma$ from
unity, most (166) are characterized by HIA$_{\rm IS}$<1 and HIA$_{\rm OS}$>1,
which suggests that the HIA core model plays a more significant role than the
CE model. The remaining four positions are consistent with the CE model. We
compare the integrated HIAs with the para-NH$_{3}$ column density
($N$(para-NH$_{3}$)), kinetic temperature ($T_{\rm K}$), total velocity
dispersion ($\sigma_{\rm v}$), non-thermal velocity dispersion ($\sigma_{\rm
NT}$), and the total opacity of the NH$_{3}$ (1,1) line ($\tau_{0}$). Their
correlations can not be fully explained by neither the HIA core nor the CE
model.

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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: supr-con
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: nucl-ex
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The categories of this paper are: stat
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The categories of this paper are: bayes-an