Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Doppler Boosting May Have Played No Significant Role in the Finding
  Surveys of Radio-Loud Quasars   There appears to be a fundamental problem facing Active Galactic Nuclei jet
models that require highly relativistic ejection speeds and small jet viewing
angles to explain the large apparent superluminal motions seen in so many of
the radio-loud quasars with high redshift. When the data are looked at closely
it is found that only a small percentage of the observed radio frequency flux
density from these sources can be Doppler boosted. Without a highly directed,
Doppler boosted component that dominates the observed flux, radio sources found
in low-frequency finding surveys cannot be preferentially selected with small
jet viewing angles. The distribution of jet orientations will then follow the
sin$i$ curve associated with a random distribution, where only a very few
sources (~1%) will have the small viewing angles (<8 deg) required to explain
apparent superluminal motions v{app > 10c, and this makes it difficult to
explain how around 33% of the radio-loud AGNs with high redshift can exhibit
such highly superluminal motions. When the boosted component is the dominant
one it can be argued that in a flux limited sample only those members with
small viewing angles would be picked up while those with larger viewing angles
(the un-boosted ones) would be missed. However, this is not the case when the
boosted component is small and a new model to explain the high apparent
superluminal motions may be needed if the redshifts of high-redshift quasars
are to remain entirely cosmological.

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The categories of this paper are: hep-th
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: adap-org
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The categories of this paper are: math
32
The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: comp-gas