A. EungwanichayapantW. LuangtipW. MaithongD. RuffoloChiang Mai Rajabhat UniversityMae Fah Luang UniversityMahidol UniversitySrinakharinwirot University2020-01-272020-01-272019-08-01Astrophysical Journal. Vol.880, No.2 (2019)153843570004637X2-s2.0-85071979990https://repository.li.mahidol.ac.th/handle/20.500.14594/50756© 2019. The American Astronomical Society. All rights reserved.. It was previously suggested that e ± pair halos could be observed in γ-rays. Searching for pair halos is a challenging topic in γ-ray astronomy that has not yet yielded a convincing detection for an individual object. Here we propose that X-ray observations could reveal the existence of e ± pair halos. To support our suggestion, we computed the observed energy and spatial distribution of X-ray photons from the pair halos and check the feasibility of pair halo detection by current and future X-ray observatories. The results show that current X-ray missions could register a positive signal for the pair halos created under some conditions. For a magnetic field (B) of ∼1 μG, the X-ray could be observable for a seed gamma-ray energy of TeV. If TeV, the observable range of B would be B ⪆ 300 nG.Mahidol UniversityEarth and Planetary SciencesArticleSCOPUS10.3847/1538-4357/ab288f