Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low ionization lines in high luminosity quasars: The calcium triplet   In order to investigate where and how low ionization lines are emitted in
quasars we are studying a new collection of spectra of the CaII triplet at
$\lambda$8498, $\lambda$8542, $\lambda$8662 observed with the Very Large
Telescope (VLT) using the Infrared Spectrometer And Array Camera (ISAAC). Our
sample involves luminous quasars at intermediate redshift for which CaII
observations are almost nonexistent. We fit the CaII triplet and the OI
$\lambda$8446 line using the H$\beta$ profile as a model. We derive constraints
on the line emitting region from the relative strength of the CaII triplet, OI
$\lambda$8446 and H$\beta$.

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The categories of this paper are: q-alg
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The categories of this paper are: eess
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
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The categories of this paper are: supr-con
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The categories of this paper are: stat
2
The categories of this paper are: math
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The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat