A Possible γ-Ray Pulsation from PSR J1740-5340B in the Globular Cluster NGC 6397

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外文摘要：Recently,a new radio millisecond pulsar(MSP)J1740-5340B,hosted in the globular cluster(GC)NGC 6397,was reported with a 5.78 ms spin period in an eclipsing binary system with a 1.97 days orbital period.Based on a modified radio ephemeris updated by tool tempo2,we analyze the～15 yr γ-ray data obtained from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope and detect PSR J1740-5340B's γ-ray pulsation at a confidence level of～4σ with a weighted H-test value of～26.By performing a phase-resolved analysis,the γ-ray luminosity in on-pulse interval of PSR J1740-5340B is Lγ～3.8 ×1033ergs-1 using NGC 6397's distance of 2.48 kpc.And γ-rays from the on-pulse part of PSR J1740-5340B contribute～90％of the total observed 7-ray emissions from NGC 6397.No significant 7-ray pulsation of another MSP J1740-5340A in the GC is detected.Considering that the previous four cases of MSPs in GCs,more data in γ-ray,X-ray,and radio are encouraged to finally confirm the γ-ray emissions from MSP J1740-5340B,especially starving for a precise ephemeris.

外文关键词：

gamma-rays:galaxies(stars:)pulsars:individual(PSR J1740-5340B)(Galaxy:)globular clusters:individual(NGC 6397)

作者：

Jiao Zheng、Pengfei Zhang、Li Zhang

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作者单位：

Department of Astronomy,School of Physics and Astronomy,Key Laboratory of Astroparticle Physics of Yunnan Province,Yunnan University,Kunming 650091,China

基金：

国家自然科学基金国家自然科学基金Basic Research Program of Yunnan ProvinceJoint Foundation of Department of Science and Technology of Yunnan Province and Yunnan UniversityXingdian Talent Support Plan-Youth Project

项目编号：

1216300612233006202201AT070137202201BF070001-020

出版年：

2024

DOI：

10.1088/1674-4527/ad1366

天文和天体物理学研究

中国科学院国家天文台

天文和天体物理学研究

CSTPCD

影响因子：0.406

ISSN：1674-4527

年,卷(期)：2024.24(1)

参考文献量57