Abstract
We report the discovery of gamma-ray detection from the Large Magellanic Cloud (LMC) B0443-6657 using the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. LMC B0443-6657 is a flat-spectrum radio source, possibly associated with a supernova remnant in the Large Magellanic Cloud (LMC N4). Employing the LAT data of 8 years, our results show a significant excess (\(>9.4\sigma \)) of gamma rays in the range of 0.2–100 GeV above the gamma-ray background. A power-law function is found to adequately describe the 0.2–\(100\mbox{ GeV}\) \(\gamma \)-ray spectrum, which yields a photon flux of \(3.27\pm 0.53\ \text{photon}\,\mbox{cm}^{2}\,\mbox{s}^{-1}\) with a photon index of \(2.35\pm 0.11\), corresponding to an isotropic gamma-ray luminosity of \(5.3\times 10^{40}~\mbox{erg}\,\mbox{s}^{-1}\). The hadronic model predicts a low X-ray and TeV flux while the leptonic model predicts an observable flux in these two energy bands. The follow-up observations of the LMC B0443-6657 in X-ray or TeV band would distinguish the radiation models of gamma rays from this region.
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Acknowledgements
We thank the anonymous referee for constructive comments and the editor for the helpful suggestion. This work has made use of the programs written by Ruo-Yu Liu. I am specially grateful to Ruo-Yu Liu, Kwan-Lok Li and Francesco Capozzi for the final revision, and Xiang-Yu Wang for the helpful suggestion. This work is supported by the Natural Science Foundation of China under grants No. 11547029, 11533004, the Youth Foundation of Jiangxi Province (No. 20161BAB211007), the Postdoctoral Foundation of Jiangxi Province (No. 2016KY17), the Natural Science Foundation of Jiangxi Provincial Department of Education (No. GJJ150077).
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Tang, QW. Discovery of GeV gamma-ray emission from the LMC B0443-6657 with the Fermi Large Area Telescope. Astrophys Space Sci 363, 25 (2018). https://doi.org/10.1007/s10509-017-3243-4
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DOI: https://doi.org/10.1007/s10509-017-3243-4