Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: BAL phosphorus abundance and evidence for immense ionic column densities
  in quasar outflows: VLT X-Shooter observations of quasar SDSS J1512+1119   We present spectroscopic analysis of the broad absorption line outflow in
quasar SDSS J1512+1119. In particular, we focus our attention on a kinematic
component in which we identify PV and SIV/SIV* absorption troughs. The shape of
the unblended phosphorus doublet troughs and the three SIV/SIV* troughs allow
us to obtain reliable column density measurements for these two ions.
Photoionization modelling using these column densities and those of HeI*
constrain the abundance of phosphorus to the range of 0.5-4 times the solar
value. The total column density, ionization parameter and metalicity inferred
from the PV and SIV column densities leads to large optical depth values for
the common transition observed in BAL outflows. We show that the true CIV
optical depth, is about 1000 times greater in the core of the absorption
profile than the value deduced from its apparent optical depth.

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The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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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: hep-th
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The categories of this paper are: hep-ex
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The categories of this paper are: plasm-ph
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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: patt-sol
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ph