Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dichotomy of radio loud and radio quiet quasars in four dimensional
  eigenvector one (4DE1) parameter space   Recent work has shown that it is possible to systematize quasars (QSOs)
spectral diversity in 4DE1 parameter space. The spectra contained in most of
the surveys have low signal to noise ratio which fed the impression that all
QSO\'{s} are spectroscopically similar. Exploration of 4DE1 parameter space
gave rise to the concept of two populations of QSOs that present important
spectroscopic differences. We aim to quantify broad emission line differences
between radio quiet and radio loud sources by exploiting more complete samples
of QSO with spectral coverage in Hbeta, MgII and CIV emission lines. We used a
high redshift sample (0.35 < z < 1) of strong radio emitter QSOs observations
from Calar Alto Observatory in Spain.

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The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg
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The categories of this paper are: q-fin
2
The categories of this paper are: math
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
1
The categories of this paper are: cs
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The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
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The categories of this paper are: funct-an