Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radio$-\gamma-$ray response in blazars as a signature of adiabatic blob
  expansion   Multiwavelength light curves in long-term campaigns have shown that, for
several blazars, the radio emission occurs with a significant delay w.r.t. to
$\gamma$-ray band, with timescales ranging from weeks to years. Such
observational evidence has been a matter of debate for years and usually is
interpreted as a signature of the $\gamma$-ray emission originating upstream in
the jet, with the emitting region becoming radio transparent at larger scales.
In this paper, we show, by means of self-consistent numerical modelling, that
the adiabatic expansion of relativistic blob can explain these delays. We use
the JetSeT framework to reproduce the numerical modelling of the
radiative/accelerative processes, reproducing the temporal evolution, from the
initial flaring activity, and the subsequent expansion. We follow the spectral
evolution and the light curves, investigating the relations among the observed
parameters, rise, time, and decay time, identifying the link with the physical
parameters. We find that, when adiabatic expansion is active, lags due to the
shift of the synchrotron frequency occur, with an offset equal to the distance
in time between the flaring onset and the beginning of the expansion, whilst
the rising and decaying timescales depend on the velocity of the expansion and
on time required to the source to exhibit a synchrotron self-absorption
frequency. We derive an inter-band response function, and we investigate the
effects of the competitions between radiative and adiabatic cooling timescales
on the response. We apply the response function to long-term radio and
$\gamma-$ray light curves of Mrk 421, Mrk 501 and 3C 273, finding a
satisfactory agreement on the log-term behaviour, and we use a Monte Carlo
Markov Chain approach, to estimate some physical relevant parameters. We
discuss the applications to polarization measurements, and to jets collimation
profile kinematics.

12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
2
The categories of this paper are: math
14
The categories of this paper are: math-ph