论文标题
在亚光磁盘状态下的新候选过渡毫秒脉冲星：4FGL J0407.7--5702
A New Candidate Transitional Millisecond Pulsar in the Sub-luminous Disk State: 4FGL J0407.7--5702
论文作者
论文摘要
我们报告了在先前无关的Fermi大面积望远镜$γ$ -Ray源4FGL J0407.7---5702的错误椭圆中发现可变光学和X射线源的发现。 XMM-Newton/Epic的22 kSec观察显示了具有快速变化和耀斑的X射线光曲线。 X射线频谱通过$γ= 1.7 $的硬功率定律非常合适。在几个时期内采用的光学测定法主要由中等振幅的大型变化。带有Soar和Gemini的光谱法揭示了蓝色的连续体，其宽和双峰H，并且他的发射正如紧凑型二进制的积聚磁盘所期望的那样。总体而言，4FGL J0407.7--5702的光学，X射线和$γ$ ray属性与在亚光磁盘状态下的过渡毫秒脉冲星的分类一致。我们还提供了证据表明，该来源比其他确认或候选过渡的毫秒脉冲星二进制文件更为遥远，并且X射线与$γ$ -Ray通量的比率是帮助识别此类二进制文件的有前途的工具，表明这些稀有系统更完整的人口普查是可能的。
We report the discovery of a variable optical and X-ray source within the error ellipse of the previously unassociated Fermi Large Area Telescope $γ$-ray source 4FGL J0407.7--5702. A 22 ksec observation from XMM-Newton/EPIC shows an X-ray light curve with rapid variability and flaring. The X-ray spectrum is well-fit by a hard power law with $Γ= 1.7$. Optical photometry taken over several epochs is dominated by aperiodic variations of moderate amplitude. Optical spectroscopy with SOAR and Gemini reveals a blue continuum with broad and double-peaked H and He emission, as expected for an accretion disk around a compact binary. Overall, the optical, X-ray, and $γ$-ray properties of 4FGL J0407.7--5702 are consistent with a classification as a transitional millisecond pulsar in the sub-luminous disk state. We also present evidence that this source is more distant than other confirmed or candidate transitional millisecond pulsar binaries, and that the ratio of X-ray to $γ$-ray flux is a promising tool to help identify such binaries, indicating that a more complete census for these rare systems is becoming possible.
