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

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 \textit{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-ray in the range of 0.2--100\,GeV above the gamma-ray background. A power-law function is found to be adequate to describe the $0.2-100$ GeV $\gamma$-ray spectrum, which yields a photon flux of $3.27\pm 0.53{\mathrm{photon}\mathrm{cm}}^2{\mathrm{s}}^{-1}$ with a photon index of $2.35\pm 0.11$, corresponding to an isotropic gamma-ray luminosity of $5.3\times 10^{40}{\mathrm{erg}\mathrm{s}}^{-1}$. 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.

arXiv comment11 pages, 5 figures, Publication in Astrophysics and Space Science

References in corpus (14)

• The ATNF Pulsar Catalogue
• The ATNF Pulsar Catalogue
• Energy spectra of gamma-rays, electrons and neutrinos produced at proton-proton interactions in the very high energy regime
• Detection of the Characteristic Pion-Decay Signature in Supernova Remnants
• SUMSS: A Wide-Field Radio Imaging Survey of the Southern Sky. II. The Source Catalogue
• CRATES: An All-Sky Survey of Flat-Spectrum Radio Sources
• A Robotic Wide-Angle H-Alpha Survey of the Southern Sky
• Log-parabolic spectra and particle acceleration in the BL Lac object Mkn 421: spectral analysis of the complete BeppoSAX wide band X-ray data set
• The First Fermi LAT Gamma-Ray Burst Catalog
• CGRaBS: An All-Sky Survey of Gamma-Ray Blazar Candidates
• The exceptionally powerful TeV gamma-ray emitters in the Large Magellanic Cloud
• Deep view of the Large Magellanic Cloud with 6 years of Fermi-LAT observations
• Spatial and Spectral Modeling of the Gamma-ray Distribution in the Large Magellanic Cloud
• Evidence of a spectral break in the gamma-ray emission of the disk component of Large Magellanic Cloud: a hadronic origin?

Cited by in corpus (4)

• Comparison of spectral models for disc truncation in the hard state of GX 339-4
• Minimum Spanning Tree cluster analysis of the LMC region above 10 GeV: detection of the SNRs N 49B and N 63A
• High energy gamma-ray detection of supernova remnants in the Large Magellanic Cloud
• GeV emission of gamma-ray binary with pulsar scenario