Discovery of GeV gamma-ray emission from the LMC B0443-6657 with the Fermi Large Area Telescope

作者：Tang, Qing-Wen^*

来源：Astrophysics and Space Science, 2018, 363(2): 25.

DOI：10.1007/s10509-017-3243-4

• Acceleration of particles
• Gamma rays: ISM
• ISM: individual objects (LMC B0443-6657)
• ISM: supernova remnants

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 GeV gamma-ray spectrum, which yields a photon flux of 3.27 +/- 0.53 photon cm(2) s(-1) with a photon index of 2.35 +/- 0.11, corresponding to an isotropic gamma-ray luminosity of 5.3 x 10(40) erg 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.

• 出版日期2018-2
• 单位南昌大学