Discovery of a Gamma-Ray Black Widow Pulsar by GPU-accelerated Einstein@Home
Discovery of a Gamma-Ray Black Widow Pulsar by GPU-accelerated Einstein@Home
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DOI：
10.3847/2041-8213/abbc02
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发表时间：
2020-09
期刊：
影响因子：
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通讯作者：
L. Nieder;L. Nieder;C. Clark;D. Kandel;R. Romani;Cees Bassa;B. Allen;B. Allen;B. Allen
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文献类型：
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作者：
L. Nieder;L. Nieder;C. Clark;D. Kandel;R. Romani;Cees Bassa;B. Allen;B. Allen;B. Allen
我们报告了从75分钟轨道周期的脉冲双星（现在命名为PSR J1653 - 0158）中发现的1.97 ms周期的伽马射线脉动。相关的费米大面积望远镜伽马射线源4FGL J1653.6−0158一直被认为是一颗毫秒脉冲双星。尽管有类似脉冲星的伽马射线光谱和候选的光学/X射线协会-其周期性的亮度调制暗示了一个轨道-但在许多搜索中没有发现无线电脉动。这颗脉冲星是通过使用GPU加速的Einstein@Home分布式志愿者计算系统直接搜索伽马射线数据发现的。多维参数空间由从光学对应物获得的位置和轨道约束限定。利用脉冲星定时解决方案的知识对档案和新的无线电数据进行更敏感的分析，产生非常严格的无线电发射上限。因此，任何无线电发射要么异常微弱，要么在很大一部分时间内被遮蔽。这颗脉冲星是已知脉冲星中表面磁场强度最低的三颗之一，Bsurf为104 × 107 G。结合伴星星星的光学光变曲线和光谱模型，得到的质量函数表明脉冲星的质量为1.2 M。伴星重量轻，质量为10.01 M，轨道周期是已知的旋转动力脉冲双星中最短的。这一发现证明了费米大面积望远镜发现极端恒星的潜力，否则这些恒星将无法被发现。
We report the discovery of 1.97 ms period gamma-ray pulsations from the 75 minute orbital-period binary pulsar now named PSR J1653−0158. The associated Fermi Large Area Telescope gamma-ray source 4FGL J1653.6−0158 has long been expected to harbor a binary millisecond pulsar. Despite the pulsar-like gamma-ray spectrum and candidate optical/X-ray associations—whose periodic brightness modulations suggested an orbit—no radio pulsations had been found in many searches. The pulsar was discovered by directly searching the gamma-ray data using the GPU-accelerated Einstein@Home distributed volunteer computing system. The multidimensional parameter space was bounded by positional and orbital constraints obtained from the optical counterpart. More sensitive analyses of archival and new radio data using knowledge of the pulsar timing solution yield very stringent upper limits on radio emission. Any radio emission is thus either exceptionally weak, or eclipsed for a large fraction of the time. The pulsar has one of the three lowest inferred surface magnetic-field strengths of any known pulsar with Bsurf ≈ 4 × 107 G. The resulting mass function, combined with models of the companion star’s optical light curve and spectra, suggests a pulsar mass ≳2 M⊙. The companion is lightweight with mass ∼0.01 M⊙, and the orbital period is the shortest known for any rotation-powered binary pulsar. This discovery demonstrates the Fermi Large Area Telescope's potential to discover extreme pulsars that would otherwise remain undetected.