Radio–Gamma-Ray Properties and High-Energy Implications for Fermi Blazars
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2026
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Abstract
Abstract Radio and γ-ray emissions in blazars, a subclass of active galactic nuclei (AGNs), provide important insight into their high-energy radiation processes. We studied the relation between radio and γ-ray emissions using a large sample of 1687 Fermi blazars, based on the Radio Fundamental Catalogue and the latest Third Data Release of the Fourth Fermi AGN Catalogue. A clear correlation between radio and γ-ray fluxes for both BL Lacertae objects (BL Lacs) and flat-spectrum radio quasars (FSRQs) suggests a synchrotron self-Compton (SSC) contribution to both subclasses. The ratio of γ-ray and radio emissions, γ-ray loudness (Gr), is further examined with the γ-ray photon index (Γγ) and the synchrotron peak frequency (νpeak). An anti-correlation between Gr and Γγ is explained by the shift of the spectral energy distribution rather than the Compton cooling effect. We found that Gr shows a positive dependence on νpeak for low-synchrotron-peaked BL Lacs (LBLs) and FSRQs, in line with the SSC-contributed scenario, although additional external Compton contributions may account for the substantial scatter observed in LBLs and FSRQs. In contrast, high-synchrotron-peaked BL Lacs (HBLs) reach the plateau of Gr between log (νpeak/Hz) ≃ 15.5 − 16, possibly indicating the transition from the Thomson to the Klein–Nishina (KN) regime. Interpreting this feature within a one-zone SSC framework could constrain the magnetic field strength of −4.14 < log (B/G) < −1.69 for those HBLs affected by the KN suppression.
| Reference Key |
openalex_W7201975810
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|---|---|
| Authors | Xu-Hong Ye, Wen-Xin Yang, Guohai Chen, Z. Y. Pei, Yong-Yun Chen, Yi Liu, D. Bastieri, Jun-Hui Fan |
| Journal | monthly notices of the royal astronomical society |
| Year | 2026 |
| DOI |
10.1093/mnras/stag1456
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| URL | |
| Keywords | Keywords not found |
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