gamma-ray properties of FR-Is and BL Lacs : J/PASP/135/A4101

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Authors : Ye X.-H. orcid , Zeng X.-T., Huang D.-Y. (hide) , Zeng X.-T., Huang D.-Y. et..al

VizieR DOI :
Bibcode : 2023PASP..135a4101Y (ADS) (Simbad) (Objects)
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CDS Keywords : Active gal. nuclei; Galaxies, radio; BL Lac objects; Gamma rays; Redshifts
UAT : Active galactic nuclei, Radio galaxies, BL Lacertae objects, Gamma-ray astronomy, Redshifted

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Inserted into VizieR : 05-May-2023
Last modification : 25-Aug-2023

The beaming effect for Fermi-LAT-detected FR-I radio galaxies. (2023)

Keywords : active galactic nuclei - Fanaroff-Riley radio galaxies - gamma-rays - jets

Abstract:Our knowledge of Giga-electron volt (GeV) radio galaxies has been revolutionized by the Fermi-LAT Telescope, which provides an excellent opportunity to study the physical properties of GeV radio galaxies. According to the radio power and morphology, radio galaxies can be separated into Fanaroff-Riley Type I radio galaxies (FR-Is) and Type II radio galaxies (FR-IIs). In this paper, we consider the unification of FR-Is and BL Lacertae objects (BL Lacs), and assume FR-Is to be a standard candle to discuss the beaming effect for Fermi-LAT-detected FR-Is. Our main conclusions are as follows: (1) The estimated Doppler factors for 30 Fermi-LAT-detected FR-Is are in a range of {delta}_I_=0.88-7.49. The average Doppler factor ...(more)
Abstract: (hide)
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Based on the catalog of 4FGL-DR2, 44 radio galaxies are detected by Fermi-LAT (Abdollahi et al. 2020ApJS..247...33A, Cat. J/ApJS/247/33). Subject to the FR-II samples, we only focused on the 30 Fermi-LAT-detected FR-Is and collected their redshifts from the NASA/IPAC Extragalactic Database (NED) to estimate the Doppler factors and discuss their beaming effect in the gamma-ray band. The corresponding properties and derived results of the 30 FR-Is are listed in Table 1. By cross-checking the Doppler factors (Liodakis et al., 2018ApJ...866..137L, Cat. J/ApJ/866/137; Zhang et al., 2020ApJ...897...10Z) and Fermi-LAT-detected BL Lacs (Abdollahi et al., 2020ApJS..247...33A, Cat. J/ApJS/247/33), we compiled a sample of 126 Fermi-LAT-detected BL Lacs with available Doppler factors. The detailed parameters for BL Lacs are listed in Table 2.

  • IX/67 : Incremental Fermi LAT 4th source cat. (4FGL-DR3)
  • J/ApJ/866/137 : Bright blazars variability brightness temp. (Liodakis+, 2018)
  • J/ApJS/247/33 : The Fermi LAT fourth source catalog (4FGL) (Abdollahi+, 2020)

                


                

                    

                


                

                    

                


                

                    
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