Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The power and production efficiency of blazar jets   We use published data on the power and production efficiency of jets in
blazars with double radio lobes in order to compare results obtained using
different methods. In order to eliminate selection effects, we use
cross-matched sub-samples containing only luminous blazars. We compare the
three main existing methods, namely those based on the emission of radio lobes,
on spectral fitting, and on radio core shift. We find the average jet power
obtained for identical samples with the radio-lobe method is $\sim10$ times
lower than that from the spectral fitting. In turn, the power from spectral
fitting is compatible with that from core-shift modelling for plausible
parameters of the latter. We also consider a phenomenological estimator based
on the {\gamma}-ray luminosity. We examine uncertainties of those methods and
discuss two alternative hypotheses. In one, the blazar-fit and core-shift
methods are assumed to be correct, and the lower power from radio lobes is
caused by intermittency of accretion. Long periods of quiescence cause the
energy in the radio lobes, accumulated over the lifetime of the blazar, to be
much less than that estimated based on the present luminous state. In addition,
the power calculated using the radio lobes can be underestimated for
intrinsically compact jets, in which the radio core flux can be
over-subtracted. In our second hypothesis, the radio-lobe method is assumed to
be correct, and the blazar-fit and core-shift powers are reduced due to the
presence of $\sim15$ pairs per proton, and a larger magnetization than usually
assumed, respectively.

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The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat