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arXiv 1807.02508astro-ph.HE
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红背毫秒脉冲星3FGL J0954 .8-3948的多波长观测

Multi-wavelength observations of a new redback millisecond pulsar candidate: 3FGL J0954.8-3948

Kwan-Lok Li, Xian Hou, Jay Strader, Jumpei Takata, Albert K. H. Kong, Laura Chomiuk, Samuel J. Swihart, Chung Yue Hui, K. S. Cheng

摘要:

我们提出了一个多波长的非关联费米-LAT源,3FGL J0954.8-3948,这可能是一个9.3小时的双在现场的伽马射线对应物的研究。利用超过9年的Pass 8 LAT数据,我们更新了伽马射线光谱特性和伽马射线源的LAT定位。当双星位于编目的95%误差椭圆之外时,优化的LAT椭圆接近0.1度并包围双星。该系统在X射线中可能是光谱硬的(光子指数~ 1.4),在光学,UV和可能的X射线中检测到轨道调制。在TIFR GMRT巡天(TGSS)中也发现了一个陡谱射电对应体(谱指数~ -1.6),这意味着它是一个脉冲星系统。我们在2017/2018年获得了一系列SOAR和Gemini光谱观测结果,这些观测结果显示,在初级致密天体的强辐射下,低质量次级轨道在闭合圆形轨道上运行,K2 = 272 km/s。所有的观测以及X/伽马射线高能发射的模拟表明,3FGL J0954.8-3948是一颗处于旋转动力状态的红背毫秒脉冲星。

英文摘要:

We present a multi-wavelength study of the unassociated Fermi-LAT source, 3FGL J0954.8-3948, which is likely the gamma-ray counterpart of a 9.3-hour binary in the field. With more than 9 years of Pass 8 LAT data, we updated the gamma-ray spectral properties and the LAT localization of the gamma-ray source. While the binary lies outside the cataloged 95% error ellipse, the optimized LAT ellipse is 0.1 degrees closer and encloses the binary. The system is likely spectrally hard in X-rays (photon index ~ 1.4) with orbital modulations detected in optical, UV, and possibly X-rays. A steep spectrum radio counterpart (spectral index ~ -1.6) is also found in the TIFR GMRT Sky Survey (TGSS), implying that it is a pulsar system. We obtained a series of SOAR and Gemini spectroscopic observations in 2017/2018, which show a low-mass secondary orbiting in a close circular orbit with K2 = 272 km/s under strong irradiation by the primary compact object. All the observations as well as the modelling of the X/gamma-ray high-energy emission suggest that 3FGL J0954.8-3948 is a redback millisecond pulsar in a rotation-powered state.

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