/ftp/cats/J_other/PASP/132/K4102



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J/PASP/132/K4102 Beamed and unbeamed emission of gamma-ray blazars  (Pei+, 2020)
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Beginning of ReadMe : J/PASP/132/K4102 Beamed and unbeamed emission of gamma-ray blazars (Pei+, 2020) ================================================================================ Beamed and unbeamed emission of gamma-ray blazars. Pei Z., Fan J., Yang J., Bastieri D. <Publ. Astron. Soc. Pac.,, 132, k4102 (2020)> =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 gamma-ray emission and assume that the total gamma-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 gamma-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 gamma-ray core-dominance parameters with radio core-dominance parameters. The gamma-ray beaming factor is then used to estimate the beamed and unbeamed components. Our analysis confirms that the gamma-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, Cat. J/ApJS/247/33; Ajello et al., 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).

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