期刊
PHYSICAL REVIEW LETTERS
卷 125, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.111103
关键词
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资金
- Advanced Leading Graduate Course for Photon Science (ALPS)
- JSPS KAKENHI [16H02170, 16H02198, 17J04145, 18H01246, 18H05463, 18H03722, 18K03694, 20H00153]
- Grants-in-Aid for Scientific Research [20H00153, 17J04145, 18H05463, 16H02198, 18H03722, 16H02170, 18K03694] Funding Source: KAKEN
To understand the nature of the brightest gamma-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 similar to 9 s and a period increase rate by similar to 3 x 10(-10) s s(-1). Therefore, the compact object in LS 5039 is inferred to be a rotating neutron star, rather than a black hole. Furthermore, several lines of arguments suggest that this object has a magnetic field of several times similar to 10(10) T, two orders of magnitude higher than those of typical neutron stars. The object is hence suggested to be a magnetar, which would be the first to be found in a binary. The results also suggest that the highly efficient particle acceleration process, known to be operating in LS 5039, emerges through interactions between dense stellar winds from the massive primary star, and ultrastrong magnetic fields of the magnetar.
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