发表机构
Universidade de São Paulo（圣保罗大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用CTAO模拟观测，评估其对半人马座A喷流和巨瓣伽马射线发射的探测能力，以揭示粒子加速机制。
AI 中文摘要
作为最近的射电星系，半人马座A（Cen A）已在多个波长和广泛的角尺度上被观测，为理解射电星系的运行机制提供了宝贵见解。然而，尽管它是已知的伽马射线源，产生这些高能辐射的物理机制仍不清楚。在本研究中，我们探索了切伦科夫望远镜阵列天文台（CTAO）为揭示Cen A伽马射线发射起源提供见解的能力。基于CTAO望远镜Alpha配置的仪器响应函数（IRF），我们利用模拟观测研究了光谱和形态两个领域，以评估该天文台约束千秒差距尺度喷流和南部巨瓣中粒子加速竞争模型的潜力。对于喷流，我们探索了t=50小时和200小时的CTAO观测，针对甚高能伽马射线发射的不同轻子和强子起源情景。我们表明，更长的观测活动（t=200小时）将探测延伸到数十TeV的硬谱成分的存在。形态模拟表明，CTAO可以在t=50小时内解析沿喷流的扩展伽马射线发射，区分点状和高斯空间模型，假设已知背景模型和乐观的天顶角$\vartheta=$20°。在类似假设下，我们研究了巨瓣，评估了Fermi-LAT探测到的S1区域的弥散和丝状发射模板。我们发现，对于Alpha配置和$\vartheta=$20°，CTAO-South可以对质子能量延伸超过10 TeV的强子情景敏感。总体而言，我们的结果表明，CTAO对Cen A的观测可以为揭示射电星系中高能发射和粒子加速机制提供决定性的一步。
英文摘要
As the nearest radio galaxy, Centaurus A (Cen A) has been observed across multiple wavelengths and over a broad range of angular scales, providing valuable insights into the functioning of radio galaxies. However, despite being a known source of gamma rays, the physical mechanisms responsible for these high energy emissions remain unclear. In this study, we explore the capabilities of the Cherenkov Telescope Array Observatory (CTAO) to provide insights into the origin of the gamma-ray emission from Cen A. Using simulated observations based on the CTAO Instrument Response Functions (IRF) for the Alpha Configuration of telescopes, we investigate both the spectral and morphological domains to assess the observatory's potential to constrain competing models of particle acceleration in the kiloparsec-scale jet and the Southern Giant Lobe. For the jet, we explore CTAO observations with t=50 and 200h for different leptonic and hadronic origin scenarios for the very-high-energy gamma-ray emission. We show that longer observation campaigns (t=200h) would probe the presence of hard spectral components extending to tens of TeV. Morphological simulations demonstrate that CTAO can resolve the extended gamma-ray emission along the jet, discriminating between point-like and Gaussian spatial models within t=50h, assuming a known background model and an optimistic zenith angle $\vartheta=$20°. Under similar hypotheses, we studied the Giant Lobes evaluating both diffuse and filamentary emission templates for the S1 region detected by Fermi-LAT. We found that CTAO-South can be sensitive to hadronic scenarios with proton energies extending beyond 10 TeV, for the Alpha Configuration and $\vartheta=$20°. Overall, our results indicate that CTAO observations of Cen A can provide a decisive step toward unveiling the mechanisms driving the high-energy emission and particle acceleration in radio galaxies
