Implications of axion-like particles from the Fermi-LAT and H.E.S.S. observations of PG 1553+113 and PKS 2155?304 *

Abstract We investigate the axion-like particle (ALP)-photon oscillation effect in high-energy -ray spectra of PG 1553+113 and PKS 2155?304 measured by Fermi-LAT H.E.S.S. The choice extragalactic background light (EBL) model, which induces attenuation observed spectra, affects ALP implications. For ordinary EBL model that prefers a null hypothesis, we set constraints on ALP-photon coupling constant at 95% C.L. as $g_{a\gamma}\lesssim 5\times 10^{-11} ~{\rm{GeV}}^{-1}$?> for mass $\sim 10$?> neV. also consider CIBER observation cosmic infrared radiation, shows an excess wavelengths 1~\mu$?> m after substraction foregrounds. High-energy gamma-rays from sources high redshifts would suffer more significant caused this excess. In case, find improve fit to favored parameter region C.L..