J/PASP/134/H4102 Sample of Fermi FSRQs (Huang+, 2022)
Constraining the γ-ray emission region for Fermi-detected FSRQs by the
seed photon approach.
Huang D., Li Z., Liao J., Huang X., Li C., Qian Y., Pei Z., Fan J.
<Publ. Astron. Soc. Pac.,, 134, H4102 (2022)>
=2022PASP..134h4102H 2022PASP..134h4102H (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; QSOs ; Gamma rays
Keywords: active galaxies - flat-spectrum radio quasars - gamma-ray sources
Abstract:
The location of γ-ray-emitting region in blazars has been an open
issue for several decades and is still being debated. We use the
Paliya et al. sample of 619 γ-ray-loud flat-spectrum radio quasars
with available spectral energy distributions and employ a seed photon
factor approach to locate the γ-ray production region. This method
efficiently sets up a relation between the peak frequencies and
luminosities for the synchrotron emission and inverse Compton
scattering, together with a combination of the energy density and
characteristic energy for the external seed photon field, namely,
sqrt{U0}/ε0, an indicative factor of seed photons in units
of Gauss. By comparing it with canonical values of the broad-line
region (BLR) and molecular dusty torus (DT), we principally ascertain
that the GeV emission originated far beyond the BLR and close to the
DT-farther out at parsec scales from the central black hole, which
supports a far-site scenario for γ-ray blazars. We probe the
idea that inverse Compton scattering of infrared seed photons is
happening in the Thomson regime. This approach and our findings are
based on the validity of the external Compton model, which is
applicable in understanding the GeV emission mechanism in FSRQs.
However, the completeness of this framework has been challenged by
reports of neutrino emission from blazars. Thus, we also shed new
light on the neutrino production region by using our derived results
because blazars are promising neutrino emitters.
Description:
We compile a catalog of 619 FSRQs overall. We list all the relevant
data in Table 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 75 619 Sample of Fermi FSRQs
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See also:
IX/67 : Incremental Fermi LAT 4th source cat. (4FGL-DR3) (Fermi-LAT col., 2022)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- 4FGL 4FGL name (JHHMM.m+DDMM)
14- 17 A4 --- Class Classification (1)
19- 23 F5.3 --- z Redshift
25- 29 F5.2 [Hz] lognusyn Peak frequency of synchrotron emission
31- 35 F5.2 [Hz] lognuIC Peak frequency of inverse Compton emission
37- 41 F5.2 [10-7W] logLsyn Peak luminosity of synchrotron component
43- 47 F5.2 [10-7W] logLIC Flux of the peak luminosity of the IC
component
49- 54 F6.2 --- CD Compton dominance
56- 58 A3 --- Ref Reference for lognusyn and lognuIC (2)
60- 64 F5.3 --- alpha gamma-ray photon index adopted from 4FGL-DR3
66- 70 F5.2 [10-7W] logLg gamma-ray luminosity
72- 75 F4.2 G SF Seed photon factor
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Note (1): Classification as follows:
FSRQ = confirmed FSRQs
UF = BCU, Blazar candidates of uncertain type
Note (2): P21 = Paliya et al. (2021ApJS..253...46P 2021ApJS..253...46P, Cat. J/ApJS/253/46)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Feb-2023