Possible modulated gamma-ray emission from the transitional millisecond pulsar binary PSR J1023+0038
Possible modulated gamma-ray emission from the transitional millisecond pulsar binary PSR J1023+0038
复制标题
过渡毫秒脉冲星双星 PSR J1023 0038 可能发射调制伽马射线
DOI：
10.1088/1674-4527/18/10/127
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发表时间：
2018
影响因子：
1.8
通讯作者：
Takata Jumpei
中科院分区：
文献类型：
--
作者：
Xing Yi;Wang Zhong-Xiang;Takata Jumpei
我们报告的结果，从我们的费米大面积望远镜（LAT）数据的过渡毫秒脉冲星双星PSR J1023+ 0038的分析。数据的时间周期是近9年，而在2013年6月从无盘状态到具有吸积盘的活跃状态的源转变之后，大约是4年。我们发现，在源的频谱中的高能量> 5.5 GeV的组件在活动状态下，并发现这个组件是只有显着检测到的轨道相位中心的下降节点（当脉冲星向地球移动）的一半。考虑到脉冲星的情况下提出的多频发射源，其中脉冲星仍然是活跃的和冷相对论脉冲星风逆康普顿散射的吸积盘的光子，我们讨论了高能量分量的起源。为了解释观测到的光谱，需要脉冲星风中粒子指数为10.3的幂律分布，而轨道变化可能是由于幂律指数随轨道相位而变化。
We report the results from our analysis of Fermi Large Area Telescope (LAT) data for the transitional millisecond pulsar binary PSR J1023+ 0038. The time period of the data is nearly 9 yr, and that after the source's transition, in June 2013 from the disk-free state to the active state of having an accretion disk, is approximately 4 yr. We identify a high-energy> 5.5 GeV component in the source's spectrum in the active state, and find this component is only significantly detected in half of the orbital phase centered at the descending node (when the pulsar is moving towards the Earth). Considering the pulsar scenario proposed for multi-frequency emission from the source, in which the pulsar is still active and a cold-relativistic pulsar wind inverse-Compton scatters the photons from the accretion disk, we discuss the origin of the high-energy component. In order to explain the observed spectrum, a power-law distribution of particles, with an index of∼ 3, in the pulsar wind is required, while the orbital variations are possibly due to changes in power-law index as a function of orbital phase.