A compact X-ray emitting binary in likely association with 4FGL J0935.3+0901
A compact X-ray emitting binary in likely association with 4FGL J0935.3+0901
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可能与 4FGL J0935.3 0901 有关的紧凑型 X 射线发射二进制文件
DOI：
10.1093/mnras/staa655
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发表时间：
2020
影响因子：
4.8
通讯作者：
Serabyn Eugene
中科院分区：
文献类型：
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作者：
Wang Zhongxiang;Xing Yi;Zhang Jujia;Boutsia Konstantina;Wang Gege;Jithesh V;Burdge Kevin B.;Coughlin Michael W.;Duev Dmitry A.;Kulkarni S. R.;Riddle Reed;Serabyn Eugene
4FGL J0935.3+0901是费米伽马射线空间望远镜（Fermi Gamma-Ray Space Telescope，LAT）探测到的一个γ射线源。我们已经进行了详细的LAT数据分析，这个源和多波长研究的源字段。它的γ射线辐射符合幂律（Γ = 2.0 ± 0.2），截止能量为指数（Ec= 2.9 ± 1.6 GeV），而辐射通量有明显的长期变化。通过对Neil Gehrels Swift天文台X射线望远镜观测数据的分析，我们发现在LAT的2σ误差范围内只有一个X射线源。在X射线源的半径误差圆内，只有一个光学物体在23倍磁以下。光学物体的时间分辨测光表明可能有2.5小时的周期性调制，而其光谱显示双峰氢和氦发射线（类似于低质量X射线双星中的吸积盘）。结合这些结果，我们得出结论，我们已经发现了一个紧凑的X射线发射双星可能与4FGL J0935.3+0901，即毫秒脉冲星（MSP）的二进制。我们讨论的光学光谱特征的含义：这二进制可能是一个过渡MSP系统在亚发光盘状态，虽然其他的可能性，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，从而澄清其目前的状态。
4FGL J0935.3+0901 is a γ-ray source detected by the Large Area Telescope (LAT) onboard theFermi Gamma-Ray Space Telescope. We have conducted detailed analysis of the LAT data for this source and multiwavelength studies of the source field. Its γ-ray emission can be described with a power law (Γ = 2.0 ± 0.2) with an exponential cut-off (Ec= 2.9 ± 1.6 GeV), while the flux shows significant long-term variations. From analysis of archivalNeil Gehrels Swift ObservatoryX-Ray Telescope data, we find only one X-ray source in the LAT’s 2σ error region. Within aradius error circle of the X-ray source, there is only one optical object down tor′ ∼ 23 mag. Time-resolved photometry of the optical object indicates a likely 2.5 h 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 subluminous disc state, although the other possibility, the binary in a rotation-powered state showing the optical emission lines due to intrabinary interaction processes, cannot be excluded. Further observational studies will help to determine detailed properties of this candidate MSP binary and thus clarify its current state.