2022MNRAS.515.2215C

By comparing the Fourth Fermi Large Area Telescope active galactic nuclei (AGNs) Catalog Data Release 2 (4LAC-DR2) and the Radio Fundamental Catalog (RFC-2021b), we obtain an AGN sample containing 2816 AGNs. We calculate the γ-ray loudness (G_γ) of the sample sources, and establish the relevant relationship between several gamma/radio properties. The results show that: 1) the synchrotron peak frequency ($\nu _\mathrm{peak}^S$) strongly correlates with the γ-ray photon spectral index (Γ_γ), γ-ray luminosity (L_γ), and radio luminosity (L_R); 2) the low-synchrotron-peaked BL Lac objects (LBLs) and the flat-spectrum radio quasars (FSRQs) partially overlap in log $\nu _\mathrm{peak}^S\!-\!\Gamma _\gamma$, log L_γ-Γ_γ, log L_R-Γ_γ, log G_γ-Γ_γ, log $\nu _\mathrm{peak}^S\!-\!$log L_γ, log $\nu _\mathrm{peak}^S\!-\!$log L_R, and log $\nu _\mathrm{peak}^S\!-\!$log G_γ space. We plotted the distribution of redshift (z), $\nu _\mathrm{peak}^S$, Γ_γ, L_γ, VLBI 8.4 GHz flux density ($S_{\rm {8.4\, GHz}}$), and G_γ to distinguish FSRQs and LBLs. We note that $\nu _\mathrm{peak}^S$, Γ_γ, and $S_{8.4\, {\rm GHz}}$ show similar bimodal distributions. To further determine whether FSRQs are misjudged as LBLs, we examined the Compton dominance (CD), and found that CD < 1 for only two out of 39 sources. This measurement provides further evidence that FSRQs may be mistaken for LBLs.