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We obtain a stringent upper limit on axion-photon coupling from the 1038 days gamma-ray observations of the TeV blazar Markarian 421. The long-term VHE gamma-ray spectra are measured by the collaborations Fermi-LAT and HAWC from 2015 June to 2018 July. We show the best-fit SEDs of Markarian 421 under the null and axion hypotheses. Then we set the axion-photon limit in the \mₐ, \, g₀\ plane. The 99% C. L. upper limit set by Markarian 421 is g₀ 4. 0 10^-12 \, GeV^-1 for the axion mass 1. 010^-9 \, eV mₐ 1. 010^-8 \, eV. It is the most stringent upper limit in this axion mass region.
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Li et al. (Sat,) studied this question.
synapsesocial.com/papers/68e67058b6db6435875fab44 — DOI: https://doi.org/10.48550/arxiv.2406.00387
Haijun Li
Qiqihar University
Wei Chao
Guizhou Institute of Biology
Yu-Feng Zhou
South China Agricultural University
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