Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Similarity of Jet Radiation between Flat Spectrum Radio Quasars and GeV
  Narrow-Line Seyfert 1 Galaxies: A Universal $\delta$-$L_{\rm c}$ Correlation   By modeling the broadband spectral energy distributions (SEDs) of a typical
flat spectrum radio quasar (FSRQ, 3C 279) and two GeV narrow-line Seyfert 1
galaxies (NLS1s, PMN J0948+0022 and 1H 0323+342) in different flux stages with
the one-zone leptonic models, we find a universal correlation between their
Doppler factors ($\delta$) and peak luminosities ($L_{\rm c}$) of external
Compton scattering bumps. Compiling a combined sample of FSRQs and GeV NLS1s,
it is found that both FSRQs and GeV NLS1s in different stages and in different
sources well follow the same $\delta$-$L_{\rm c}$ correlation. This indicates
that the variations of observed luminosities may be essentially due to the
Doppler boosting effect. And the universal $\delta$-$L_{\rm c}$ relation
between FSRQs and GeV NLS1s in different stages may be further evidence that
the particle acceleration and radiation mechanisms for the two kinds of sources
are similar. In addition, by replacing $L_{\rm c}$ with the observed luminosity
in the Fermi/LAT band ($L_{\rm LAT}$), this correlation holds, and it may serve
as an empirical indicator of $\delta$. We estimate the $\delta$ values with
$L_{\rm LAT}$ for 484 FSRQs in the Fermi/LAT Catalog and they range from 3 to
41, with a median of 16, which are statistically consistent with the values
derived by other methods.

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The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ph