Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Blazar sequence - an artefact of Doppler boosting   The blazar sequence is a scenario in which the bolometric luminosity of the
blazar governs the appearance of its spectral energy distribution. The most
prominent result is the significant negative correlation between the
synchrotron peak frequencies and the synchrotron peak luminosities of the
blazar population. Observational studies of the blazar sequence have, in
general, neglected the effect of Doppler boosting. We study the dependence of
both the synchrotron peak frequency and luminosity with Doppler-corrected
quantities. We determine the spectral energy distributions of 135 radio-bright
AGN and find the best-fit parabolic function for the distribution to quantify
their synchrotron emission. The corresponding measurements of synchrotron peak
luminosities and frequencies are Doppler-corrected with a new set of Doppler
factors calculated from variability data. The relevant correlations for the
blazar sequence are determined for these intrinsic quantities. The Doppler
factor depends strongly on the synchrotron peak frequency, the lower energy
sources being more boosted. Applying the Doppler correction to the peak
frequencies and luminosities annuls the negative correlation between the two
quantities, which becomes positive. For BL Lacertae objects, the positive
correlation is particularly strong. The blazar sequence, when defined as the
anticorrelation between the peak frequency and luminosity of the synchrotron
component of the spectral energy distribution, disappears when the intrinsic,
Doppler-corrected values are used. It is an observational phenomenon created by
variable Doppler boosting across the synchrotron peak frequency range.

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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
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The categories of this paper are: cs
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The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
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The categories of this paper are: hep-th