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arXiv 2106.07657astro-ph.HE
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一颗新的耀斑模式过渡毫秒脉冲星的多波长证据

Multiwavelength evidence for a new flare-mode transitional millisecond pulsar

Jay Strader, Samuel J. Swihart, Ryan Urquhart, Laura Chomiuk, Elias Aydi, Arash Bahramian, Adam Kawash, Kirill V. Sokolovsky, Evangelia Tremou, Andrej Udalski

摘要:

我们报告了在非关联费米GeV伽马射线源4FGL J0540.0-7552的中心附近发现一个新的低质量X射线双星。该源显示持续存在的光学吸积盘,并表现出极端的X射线和光学可变性。它也有一个X射线光谱很好地符合硬幂律,伽马= 1.8和高比率的X射线伽马射线通量。总之,这些属性是一致的分类的二进制作为过渡毫秒脉冲星(tMSP)在亚发光盘状态。在候选tMSP中,4FGL J0540.0-7552显示出一致的光学、X射线和伽马射线证据,表明它经历了状态变化,在2013年中期的某个时候,光学和X射线变得明显更亮,而在GeV伽马射线中变得更暗。在它目前的亚发光盘状态下,就像银河系中的另一个候选tMSP一样,4FGL J0540.0-7552似乎总是处于X射线“耀斑模式”,这表明这可能是tMSP的常见现象。

英文摘要:

We report the discovery of a new low-mass X-ray binary near the center of the unassociated Fermi GeV gamma-ray source 4FGL J0540.0-7552. The source shows the persistent presence of an optical accretion disk and exhibits extreme X-ray and optical variability. It also has an X-ray spectrum well-fit by a hard power law with a Gamma = 1.8 and a high ratio of X-ray to gamma-ray flux. Together, these properties are consistent with the classification of the binary as a transitional millisecond pulsar (tMSP) in the sub-luminous disk state. Uniquely among the candidate tMSPs, 4FGL J0540.0-7552 shows consistent optical, X-ray, and gamma-ray evidence for having undergone a state change, becoming substantially brighter in the optical and X-rays and fainter in GeV gamma-rays sometime in mid-2013. In its current sub-luminous disk state, and like one other candidate tMSP in the Galactic field, 4FGL J0540.0-7552 appears to always be in an X-ray "flare mode", indicating that this could be common phenomenology for tMSPs.

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