IDENTIFICATION OF THE HIGH-ENERGY GAMMA-RAY SOURCE 3FGL J1544.6–1125 AS A TRANSITIONAL MILLISECOND PULSAR BINARY IN AN ACCRETING STATE
IDENTIFICATION OF THE HIGH-ENERGY GAMMA-RAY SOURCE 3FGL J1544.6–1125 AS A TRANSITIONAL MILLISECOND PULSAR BINARY IN AN ACCRETING STATE
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DOI：
10.1088/2041-8205/803/2/l27
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发表时间：
2015-03
期刊：
影响因子：
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通讯作者：
S. Bogdanov;J. Halpern
中科院分区：
文献类型：
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作者：
S. Bogdanov;J. Halpern
我们目前的X射线，紫外线和光学观测1 RXS J154439.4-112820，最可能的对应物的非关联费米-LAT源3FGL J1544.6-1125。光学数据揭示了快速的变化，这是吸积系统的一个特征。X射线表现出大幅度的变化，其形式是在两个不同的通量水平之间快速切换（在10秒内），这两个通量水平相差10倍。详细的光学和X射线行为几乎与过渡毫秒脉冲星（MSP）双星PSR J1023+0038和XSS J12270-4859的吸积盘主导状态相同，它们也与γ射线源有关。基于现有的观测证据，我们得出结论，1 RXS J154439.4-112820和3FGL J1544.6-1125是同一个物体，X射线产生于间歇性的低光度吸积到MSP上，γ射线来自吸积驱动的外流。1 RXS J154439.4-112820只是第四个被确认的低质量X射线双星系统，并且很可能会偶尔经历转变为非吸积旋转动力脉冲星系统。
We present X-ray, ultraviolet, and optical observations of 1RXS J154439.4–112820, the most probable counterpart of the unassociated Fermi-LAT source 3FGL J1544.6–1125. The optical data reveal rapid variability, which is a feature of accreting systems. The X-rays exhibit large-amplitude variations in the form of fast switching (within ∼10 s) between two distinct flux levels that differ by a factor of ≈10. The detailed optical and X-ray behavior is virtually identical to that seen in the accretion-disk-dominated states of the transitional millisecond pulsar (MSP) binaries PSR J1023+0038 and XSS J12270–4859, which are also associated with γ-ray sources. Based on the available observational evidence, we conclude that 1RXS J154439.4–112820 and 3FGL J1544.6–1125 are the same object, with the X-rays arising from intermittent low-luminosity accretion onto an MSP and the γ-rays originating from an accretion-driven outflow. 1RXS J154439.4–112820 is only the fourth γ-ray-emitting low-mass X-ray binary system to be identified and is likely to sporadically undergo transformations to a non-accreting rotation-powered pulsar system.