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

Takahashi, T.; Enoto, T.; Makishima, K. +3 more

To understand the nature of the brightest γ -ray binary system LS 5039, hard x-ray data of the object, taken with the Suzaku and NuSTAR observatories in 2007 and 2016, respectively, were analyzed. The two data sets jointly gave tentative evidence for a hard x-ray periodicity, with a period of ∼9 s and a period increase rate by ∼3 ×10^-10…