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arXiv 2003.08509astro-ph.HE
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一个可能与4FGL J0935 .3+0901成协的致密X射线双星

A Compact X-Ray Emitting Binary in Likely Association with 4FGL J0935.3+0901

Zhongxiang Wang, Yi Xing, Jujia Zhang, Konstantina Boutsia, Gege Wang, Jithesh V., Kevin B. Burdge, Michael W. Coughlin, Dmitry A. Duev, S. R. Kulkarni, Reed Riddle, Eugene Serabyn

摘要:

4FGL J0935.3+0901是费米伽马射线太空望远镜(英语:Fermi Gamma-Ray Space Telescope)上的大面积望远镜(LAT)探测到的伽马射线源。我们已经进行了详细的LAT数据分析,这个源和多波长的源场的研究。它的伽马射线发射可以用幂律($Γ=2.0\pm0.2$)和指数截止($E_c=2.9\pm1.6$ GeV)来描述,而通量显示出显着的长期变化。从分析档案尼尔Gehrels斯威夫特X射线望远镜的数据,我们发现只有一个X射线源在LAT的2 $σ$的错误区域。在X射线源的3.7”半径误差圆内,只有一个低至$r'\sim$ 23等的光学物体。光学物体的时间分辨测光表明可能有2.5小时的周期调制,而其光谱显示氢和氦的双峰发射线(类似于在低质量X射线双星的吸积盘中看到的)。结合这些结果,我们得出结论,我们发现了一个紧凑的发射X射线的双星,可能与4FGL J 0935.3 +0901有关,即,毫秒脉冲星双星我们讨论的光学光谱特征的含义:这个二进制可能是一个过渡MSP系统在一个亚发光盘状态,虽然另一种可能性,二进制在旋转供电状态下显示的光发射线,由于intrabinary相互作用过程,不能排除。进一步的观测研究将有助于确定这个候选MSP双星的详细性质,从而澄清它的当前状态。

英文摘要:

4FGL J0935.3+0901 is a gamma-ray source detected by the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope. We have conducted detailed analysis of the LAT data for this source and multi-wavelength studies of the source field. Its gamma-ray emission can be described with a power law ($Γ=2.0\pm0.2$) with an exponential cutoff ($E_c=2.9\pm1.6$ GeV), while the flux shows significant long-term variations. From analysis of archival Neil Gehrels Swift X-ray Telescope data, we find only one X-ray source in the LAT's 2$σ$ error region. Within a 3.7" radius error circle of the X-ray source, there is only one optical object down to $r'\sim$23 mag. Time-resolved photometry of the optical object indicates a likely 2.5~hr periodic modulation, while its spectrum shows double-peaked hydrogen and helium emission lines (similar to those seen in accretion discs in low-mass X-ray binaries). Combining these results, we conclude that we have discovered a compact X-ray emitting binary in likely association with 4FGL J0935.3+0901, i.e., a millisecond pulsar (MSP) binary. We discuss the implication of the optical spectral features: this binary could be a transitional MSP system at a sub-luminous disc state, although the other possibility, the binary in a rotation-powered state showing the optical emission lines due to intrabinary interaction processes, can not be excluded. Further observational studies will help determine detailed properties of this candidate MSP binary and thus clarify its current state.

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