Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A new measurement of zinc metallicity in a DLA at z=3.35   We present chemical abundance measurements in the z_abs=3.35045 Damped
Lyman-alpha (DLA) system observed in the UVES spectrum of the BAL quasar BR
1117-1329. We measure a neutral hydrogen column density N(HI)=6.9+/-1.7*10^{20}
atoms/cm2 and derive mean abundances relative to solar: [Si/H] = -1.26+/-0.13,
[Fe/H]=-1.51+/-0.13, [Ni/H]=-1.57+/-0.13, [Cr/H]=-1.36+/-0.13,
[Zn/H]=-1.18+/-0.13, [Al/H]>-1.25, [O/H]>-1.25 and [N/H]<-2.24. This is the
third measurement of Zn, an element mildly depleted onto dust grain, at
z_abs>3. The iron to zinc and chromium to zinc ratios, [Fe/Zn]=-0.33+/-0.05 and
[Cr/Zn]=-0.18+/-0.05 demonstrate that the absorber has a low dust content. The
nitrogen ratio [N/Si]<-0.98 suggests that the ``secondary'' N production
process is taking place in this DLA. Finally, this absorber does not seem to
present a convincing alpha-enhancement as shown by the alpha over Fe-peak
element ratios: [Si/Fe]=0.25+/-0.06, [Si/Cr]=0.10+/-0.06 and
[Si/Zn]=-0.08+/-0.06.

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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
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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: math-ph
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
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The categories of this paper are: nlin