Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nebular spectroscopy of SN 2014J: Detection of stable nickel in near
  infrared spectra   We present near infrared (NIR) spectroscopy of the nearby supernova 2014J
obtained $\sim$450 d after explosion. We detect the [Ni II] 1.939 $\mu$m line
in the spectra indicating the presence of stable $^{58}$Ni in the ejecta. The
stable nickel is not centrally concentrated but rather distributed as the iron.
The spectra are dominated by forbidden [Fe II] and [Co II] lines. We use lines,
in the NIR spectra, arising from the same upper energy levels to place
constraints on the extinction from host galaxy dust. We find that that our data
are in agreement with the high $A_V$ and low $R_V$ found in earlier studies
from data near maximum light. Using a $^{56}$Ni mass prior from near maximum
light $\gamma$-ray observations, we find $\sim$0.05 M$_\odot$ of stable nickel
to be present in the ejecta. We find that the iron group features are
redshifted from the host galaxy rest frame by $\sim$600 km s$^{-1}$.

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The categories of this paper are: cs
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The categories of this paper are: econ
20
The categories of this paper are: acc-phys
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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: patt-sol
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The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an
30
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: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat