Recently, the Large High Altitude Air Shower Observatory (LHAASO) collaboration presented the first catalog of γ-ray sources using 508 days of LHAASO data, from 2021 March to 2022 September. This catalog contains four blazars and a possible LINER-type active galactic nucleus (AGN) counterpart. In this work, we establish averaged multiwavelength spectral energy distributions (SEDs) by combining data from the Fermi-Large Area Telescope, Swift, Zwicky Transient Facility, and Wide-field Infrared Survey Explorer (WISE) covering the same period as the LHAASO detection. In general, these five AGNs are found in low states at all wavelengths. To study the multiwavelength properties of these AGNs, several jet emission models, including the one-zone leptonic model, the one-zone leptonic and hadronuclear (pp) model, the one-zone proton-synchrotron model, and the spine-layer model, are applied to reproduce their averaged SEDs. We find that the one-zone leptonic model can reproduce most of the SEDs, except for the high-energy tail of the LHAASO spectra of Mrk 421 and Mrk 501. To improve the fitting, emission from pp interactions is favored in the framework of a one-zone model. The spine-layer model, which can be treated as a multizone scenario, can also provide good spectral fits. The influence of different extragalactic background light models on fitting a LHAASO energy spectrum is also discussed.

中文翻译：

---

LHAASO 探测到的活动星系核的宽带多波长研究

最近，大型高空空气簇射天文台（LHAASO）合作推出了第一个目录γ射线源使用 2021 年 3 月至 2022 年 9 月 508 天的 LHAASO 数据。该目录包含四个耀变体和一个可能的 LINER 型活动银河核（AGN）对应物。在这项工作中，我们通过结合来自费米大面积望远镜、Swift、Zwicky瞬态设施和广域红外巡天探测器（WISE）的数据，建立了平均多波长光谱能量分布（SED），覆盖了与LHAASO探测相同的时期。一般来说，这五个活动星系核在所有波长下都处于低态。为了研究这些活动星系核的多波长特性，几种射流发射模型，包括单区轻子模型、单区轻子模型和强核模型（PP）模型、单区质子同步加速器模型和脊柱层模型被用来重现它们的平均 SED。我们发现单区轻子模型可以重现大多数 SED，除了 Mrk 421 和 Mrk 501 的 LHAASO 光谱的高能尾部。为了改进拟合，发射PP互动在单区模型的框架中受到青睐。脊椎层模型可以被视为多区域场景，也可以提供良好的光谱拟合。还讨论了不同河外背景光模型对LHAASO能谱拟合的影响。