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Sign of Hard-X-Ray Pulsation from the γ-Ray Binary System LS 5039.

H Yoneda1,2,3, K Makishima1,2, T Enoto4

  • 1Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.

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|September 25, 2020
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The brightest gamma-ray binary, LS 5039, may host a magnetar, a rare type of neutron star with an extremely strong magnetic field. This discovery could explain particle acceleration within the binary system.

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Area of Science:

  • High-energy astrophysics
  • X-ray astronomy
  • Binary star systems

Background:

  • LS 5039 is a prominent gamma-ray binary system.
  • Understanding the nature of its compact object is crucial for high-energy astrophysics.

Purpose of the Study:

  • To investigate the nature of the compact object in the LS 5039 system.
  • To analyze hard X-ray emission from LS 5039.

Main Methods:

  • Analysis of hard X-ray data from Suzaku (2007) and NuSTAR (2016) observatories.
  • Investigation of X-ray periodicity and its rate of change.

Main Results:

  • Tentative evidence for a hard X-ray periodicity of ~9 seconds.
  • Inferred a period increase rate of ~3x10^-10 s/s.
  • Suggests the compact object is a rotating neutron star, likely a magnetar with a magnetic field of ~10^10 T.
  • Identifies the first magnetar found in a binary system.

Conclusions:

  • The compact object in LS 5039 is likely a magnetar.
  • The magnetar's strong magnetic field interacts with stellar winds, driving particle acceleration.
  • This finding offers new insights into particle acceleration mechanisms in binary systems.