We investigate the axion-like particle (ALP)-photon oscillation effect in the high-energy -ray spectra of PG 1553+113 and PKS 2155−304 measured by Fermi-LAT and H.E.S.S. The choice of extragalactic background light (EBL) model, which induces the attenuation effect in observed -ray spectra, affects the ALP implications. For the ordinary EBL model that prefers a null hypothesis, we set constraints on the ALP-photon coupling constant at 95% C.L. as for the ALP mass neV. We also consider the CIBER observation of the cosmic infrared radiation, which shows an excess at wavelengths of m after the substraction of foregrounds. High-energy gamma-rays from extragalactic sources at high redshifts would suffer from a more significant attenuation effect caused by this excess. In this case, we find that the ALP-photon oscillation would improve the fit to the observed spectra of PKS 2155−304 and PG 1553+113 and find a favored parameter region at 95% C.L..

我们研究了Fermi-LAT 和 HESS 测量的 PG 1553+113 和 PKS 2155−304的高能射线光谱中的类轴子粒子 (ALP)-光子振荡效应河外背景光 (EBL) 模型的选择，这会在观察到的射线光谱中引起衰减效应，从而影响 ALP 的含义。对于偏好零假设的普通 EBL 模型，我们将 ALP-光子耦合常数设置为 95% CL 的约束，与 ALP 质量neV 一样。我们还考虑了对宇宙红外辐射的 CIBER 观测，它显示出在减去前景后的 m。来自高红移的河外源的高能伽马射线将遭受由这种过量引起的更显着的衰减效应。在这种情况下，我们发现 ALP 光子振荡会改善对 PKS 2155-304 和 PG 1553+113 的观测光谱的拟合，并在 95% CL 处找到一个有利的参数区域。