J/PASP/132/K4102 Beamed and unbeamed emission of gamma-ray blazars (Pei+, 2020)
Beamed and unbeamed emission of γ-ray blazars.
Pei Z., Fan J., Yang J., Bastieri D.
<Publ. Astron. Soc. Pac.,, 132, k4102 (2020)>
=2020PASP..132k4102P 2020PASP..132k4102P (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; QSOs ; Redshifts; Radio sources
Abstract:
A two-component model of radio emission has been used to explain some
radio observational properties of Active Galactic Nuclei (AGNs) and,
in particular, of blazars. In this work, we extend the two-component
idea to the γ-ray emission and assume that the total γ-ray
output of blazars consists of relativistically beamed and unbeamed
components. The basic idea leverages the correlation between the radio
core-dominance parameter and the γ-ray beaming factor. To do so,
we evaluate this correlation for a large sample of 584 blazars taken
from the fourth source catalog of the Fermi Large Area Telescope
(Fermi-LAT) and correlated their γ-ray core-dominance parameters
with radio core-dominance parameters. The γ-ray beaming factor
is then used to estimate the beamed and unbeamed components. Our
analysis confirms that the γ-ray emission in blazars is mainly
from the beamed component.
Description:
The Fermi-Large Area Telescope (Fermi-LAT) has revolutionized our view
of the gamma-ray sky. They are collated into the latest Fermi catalog,
4FGL, which includes 5065 sources based on the first 8 yr of data.
AGNs are the vast majority of the catalog entries and 98% of AGNs are
blazars (Abdollahi et al., 2020ApJS..247...33A 2020ApJS..247...33A, Cat. J/ApJS/247/33;
Ajello et al., 2020ApJ...892..105A 2020ApJ...892..105A).
We have separated the beamed and unbeamed contributions to the total
gamma-ray emission for a sample of 584 Fermi-detected blazars with
available radio core-dominance parameters (Pei et al., SCPMA, 63,
259511).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 87 584 Sample of Fermi Blazars
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See also:
J/ApJS/247/33 : The Fermi LAT fourth source catalog (4FGL) (Abdollahi+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- 4FGL 4FGL name (4FGL JHHMM.m+DDMM)
19- 37 A19 --- Name IAU Name
39- 42 A4 --- Class Classification (1)
44- 48 F5.3 --- z Redshift
50- 55 F6.4 --- alphag gamma-ray photon index
57- 60 F4.2 --- e_alphag rms uncertainty on alphag
62- 66 F5.2 [W/Hz] logLg gamma-ray luminosity
68- 71 F4.2 [W/Hz] e_logLg rms uncertainty on logLg
73- 77 F5.2 --- logRradio Radio core-dominance parameter at 5GHz
79- 81 A3 --- r_logRradio [P20] Reference for logxRradio (2)
83- 87 F5.2 --- Rgamma Derived gamma-ray core-dominance parameter
in this work
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Note (1): Classification as follows:
BL = Fermi BL Lacerate objects
FSRQ = Fermi flat spectrum radio quasars
BCU = blazar candidates of unknown class
Note (2): References as follows:
P20 = Pei et al., SCPMA, 63, 259511
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Feb-2021