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Cyclotron Resonant Scattering Feature in Be X-ray pulsar GRO J1008-57

16 Jun 2022, 14:30
15m

Speaker

王伟 (WHU)

Description

回旋吸收线是直接测量中子星表面超强磁场的唯一手段,也是研究中子星吸积物理及辐射性质的重要工具。GRO J1008-57是一个Be X-ray pulsar的暂现源,中子星自转周期93秒。慧眼X射线卫星在该天体2017年的II型X射线爆发中观测到能量达90 keV的回旋吸收线,暗示其表面磁场强度超过10^13 G,是目前测量的最高磁场强度。中子星的回旋吸收线能量是不断演化,随X射线光度有一定相关性;GRO J1008-57的回旋吸收线能量与X射线光度呈现一个复杂的演化,小于5e37 erg/s时回旋吸收线能量与光度是反相关,大于该光度时则是正相关。该演化关系与现有吸积柱模型不吻合,我们认为吸积柱几何变化可以导致谱线能量的位移。
Topic X射线双星

Primary author

王伟 (WHU)

Presentation materials