Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The radio properties of radio-quiet quasars   Although radio-quiet quasars (RQQs) constitute >90% of optically-identified
quasar samples their radio properties are only poorly understood. In this paper
we present the results of a multi-frequency VLA study of 27 low-redshift RQQs.
We detect radio emission from 20 objects, half of which are unresolved (<
0.24''). In cases where significant structure can be resolved, double, triple
and linear radio sources on scales of a few kpc are found. The radio emission
(typically) has a steep spectrum (alpha ~ 0.7), and high brightness
temperatures (T_B > 10^5 K) are measured in some of the radio components. The
RQQs form a natural extension to the radio luminosity - absolute magnitude
distribution of nearby Seyfert 1s. We conclude that a significant fraction of
the radio emission in RQQs originates in a compact nuclear source directly
associated with the quasar. There are no significant differences between the
radio properties of RQQs with elliptical hosts and those in disc galaxies
within the current sample.

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The categories of this paper are: hep-th
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
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The categories of this paper are: math
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat