CTCV J2056-3014：一个X射线微弱的中间极区，拥有一个极其快速旋转的白矮星
CTCV J2056-3014: An X-ray-faint Intermediate Polar Harboring An Extremely Fast-spinning White Dwarf
摘要：
我们报告的XMM-牛顿X射线观测显示CTCV J2056-3014是一个不寻常的吸积动力，中间极性（IP）系统。它属于X射线-微弱IP类，其空间密度保持不受约束，但可能非常高，L $_{x,0.3-12 keV}$为1.8 $\times$ 10 $^{31}$ erg s $^{-1}$。我们在X射线中发现了一个相干的29.6s脉动，这也是我们对已发表的光学数据进行重新分析时发现的，表明该系统拥有迄今为止旋转最快，安全已知的白矮星（WD）。系统中没有实质性的X射线吸收。在WD上方的一个高激波中，吸积以适度的速率发生（$\sim$ 6 $\times$ 10 $^{-12}$ M $_{\odot}$ yr $^{-1}$），而恒星似乎处于平衡旋转状态，磁场较低。对CTCV J2056-3014的进一步研究可能会对WD中磁场的起源，磁性激变变量的人口和演化以及快速旋转磁性WD周围物质的物理学产生广泛的影响。
英文摘要：
We report on XMM-Newton X-ray observations that reveal CTCV J2056-3014 to be an unusual accretion-powered, intermediate polar (IP) system. It is a member of the class of X-ray-faint IPs whose space density remains unconstrained but potentially very high, with L$_{x,0.3-12 keV}$ of 1.8$\times$10$^{31}$ erg s$^{-1}$. We discovered a coherent 29.6s pulsation in X-rays that was also revealed in our reanalysis of published optical data, showing that the system harbors the fastest-spinning, securely known white dwarf (WD) so far. There is no substantial X-ray absorption in the system. Accretion occurs at a modest rate ($\sim$ 6$\times$10$^{-12}$ M$_{\odot}$ yr$^{-1}$) in a tall shock above the WD, while the star seems to be spinning in equilibrium and to have low magnetic fields. Further studies of CTCV J2056-3014 potentially have broad implications on the origin of magnetic fields in WDs, on the population and evolution of magnetic cataclysmic variables, and also on the physics of matter around rapidly rotating magnetic WDs.
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