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Type: Journal article
Title: Detection of variable VHE γ-ray emission from the extra-galactic γ-ray binary LMC P3
Other Titles: Detection of variable VHE gamma-ray emission from the extra-galactic gamma-ray binary LMC P3
Author: Abdalla, H.
Abramowski, A.
Aharonian, F.
Benkhali, F.
Angüner, E.
Arakawa, M.
Armand, C.
Arrieta, M.
Backes, M.
Balzer, A.
Barnard, M.
Becherini, Y.
Tjus, J.
Berge, D.
Bernhard, S.
Bernlöhr, K.
Blackwell, R.
Böttcher, M.
Boisson, C.
Bolmont, J.
et al.
Citation: Astronomy and Astrophysics: a European journal, 2018; 610:L17-1-L17-5
Publisher: EDP Sciences
Issue Date: 2018
ISSN: 0004-6361
Statement of
H.E.S.S. Collaboration, H. Abdalla … R. Blackwell … P. DeWilt … J. Hawkes … J. Lau … N. Maxted … G. Rowell … F. Voisin … et al.
Abstract: Context. Recently, the high-energy (HE, 0.1–100 GeV) γ-ray emission from the object LMC P3 in the Large Magellanic Cloud (LMC) has been discovered to be modulated with a 10.3-day period, making it the first extra-galactic γ-ray binary. Aims. This work aims at the detection of very-high-energy (VHE, >100 GeV) γ-ray emission and the search for modulation of the VHE signal with the orbital period of the binary system. Methods. LMC P3 has been observed with the High Energy Stereoscopic System (H.E.S.S.); the acceptance-corrected exposure time is 100 h. The data set has been folded with the known orbital period of the system in order to test for variability of the emission. Results. VHE γ-ray emission is detected with a statistical significance of 6:4 δ. 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 ± 0:2) × 10³⁵ erg s⁻¹. A luminosity of (5 ± 1) × 10³⁵ erg s⁻¹ is reached during 20% of the orbit. HE and VHE γ-ray emissions are anti-correlated. LMC P3 is the most luminous γ-ray binary known so far.
Keywords: Gamma rays: stars; binaries: general; stars: massive
Description: Letter to the Editor
Rights: © ESO 2018. Article published by EDP Sciences
DOI: 10.1051/0004-6361/201732426
Grant ID: ARC
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