Towards Searching for Photons with Energies Beyond the PeV Range from Galactic PeVatrons

M. Niechciol, C. Papior,M. RisseTop Scholar

ASTROPARTICLE PHYSICS（2025）

Univ Siegen

Cited 0|Views1

Abstract

Several gamma-ray observatories have discovered photons of cosmic origin with energies in the PeV ( 10 15 eV) range. Photons at these energies might be produced as by-products from particle acceleration in so-called PeVatrons, which are widely assumed to be the sources of a large part of galactic cosmic rays. Based on recent measurements of these PeV y-sources by LHAASO and HAWC, we extrapolate the energy spectra of selected sources up to the ultra-high-energy (UHE, >= 10 PeV) regime. The goal of this study is to evaluate if (and under what conditions) giant air-shower observatories, for example the Pierre Auger Observatory, could contribute to testing the UHE luminosity of PeV y-sources. Possible propagation effects are investigated as well as the required discrimination power to distinguish photon- and hadron-initiated air showers. For present detector setups, it turns out to be challenging to achieve the required sensitivity due to the energy threshold being too high or the detection area too small. Dedicated detector concepts appear to be needed to explore the UHE frontier. Ultimately, this could provide complementary information on the sources of cosmic rays beyond the PeV regime-a key objective of current efforts in multimessenger astronomy.

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Key words

PeVatrons,Photons,Air-shower arrays,Galactic cosmic rays

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【要点】：本研究探讨利用大型空气簇射观测站搜索超出PeV能量范围的伽马射线，以测试PeV γ源的超高能辐射亮度，并评估所需的观测条件。

【方法】：基于LHAASO和HAWC的最新观测数据，对选定的PeV γ源的能谱进行外推至超高能（UHE）范围，并研究传播效应以及区分光子与强子引发空气簇射的判别能力。

【实验】：通过分析当前探测器设置，发现实现所需灵敏度存在挑战，因为能量阈值过高或探测区域过小，研究指出需要专门的探测器概念来探索UHE前沿，但论文未具体提及实验数据集名称。

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