Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The milliarcsecond-scale jet of PKS 0735+178 during quiescence   We present polarimetric 5 GHz to 43 GHz VLBI observations of the BL Lacertae
object PKS 0735+178, spanning March 1996 to May 2000. Comparison with previous
and later observations suggests that the overall kinematic and structural
properties of the jet are greatly influenced by its activity. Time intervals of
enhanced activity, as reported before 1993 and after 2000 by other studies, are
followed by highly superluminal motion along a rectilinear jet. In contrast the
less active state in which we performed our observations, shows subluminal or
slow superluminal jet features propagating through a twisted jet with two sharp
bends of about 90 deg. within the innermost three-milliarcsecond jet structure.
Proper motion estimates from the data presented here allow us to constrain the
jet viewing angle to values < 9 deg., and the bulk Lorentz factor to be between
2 and 4.

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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: cs
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The categories of this paper are: dg-ga
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The categories of this paper are: q-bio
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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
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The categories of this paper are: math
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an