Volume 301 - 35th International Cosmic Ray Conference (ICRC2017) - Session Gamma-Ray Astronomy. GA-galactic
Discovery of VHE Gamma-Ray Emission from the Binary System LMC P3
N. Komin,* M. Haupt on behalf of the H.E.S.S. collaboration
*corresponding author
Full text: pdf
Pre-published on: August 16, 2017
Published on: August 03, 2018
Abstract
Recently, the gamma-ray emission at MeV and GeV energies from the object LMC P3 in the Large Magellanic Cloud has been discovered to be modulated with a 10.3-days period, making it the first extra-galactic gamma-ray binary. This work aims at the detection of TeV gamma-ray and the search for modulation of the signal with the orbital period of the binary system. The H.E.S.S. data set has been folded with the known orbital period of the system in order to test for variability of the emission. Energy spectra are obtained for the orbit-averaged data set and for orbital phases in which the TeV flux is found at its maximum. TeV gamma-ray emission is detected with a statistical significance of 6.4 sigma. The data clearly show variability which is phase-locked to the orbital period of the system. Periodicity cannot be deduced from the H.E.S.S. data set alone. The orbit-averaged luminosity in the 1-10 TeV energy range is $1.4 \times 10^{35}$ erg/s. A luminosity of $5 \times 10^{35}$ erg/s is reached during 20% of the orbit, when the MeV/GeV emission is at its minimum.
DOI: https://doi.org/10.22323/1.301.0730
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