Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A two-zone emission model for Blazars and the role of Accretion Disk MHD
  winds   Blazars are a sub-category of radio-loud active galactic nuclei with
relativistic jets pointing towards the observer. They exhibit non-thermal
variable emission, which practically extends over the whole electromagnetic
spectrum. Despite the plethora of multi-wavelength observations, the origin of
the emission in blazar jets remains an open question. In this work, we
construct a two-zone leptonic model: particles accelerate in a small region and
lose energy through synchrotron radiation and inverse Compton Scattering.
Consequently, the relativistic electrons escape to a larger area where the
ambient photon field, which is related to Accretion Disk MHD Winds, could play
a central role in the gamma-ray emission. This model explains the Blazar
Sequence and the broader properties of blazars, as determined by Fermi
observations, by varying only one parameter, the mass accretion rate onto the
central black hole. Flat Spectrum Radio Quasars have a strong ambient photon
field and their gamma-ray emission is dominated by the more extensive zone,
while in the case of BL Lac objects, the negligible ambient photons make the
smaller, i.e. acceleration, zone dominant.

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The categories of this paper are: q-alg
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics