论文标题
搜索Chandra检测到的单帧快速X射线瞬变
Searching for single-frame rapid X-ray transients detected with Chandra
论文作者
论文摘要
我们提出了一种新方法，以识别使用聚焦望远镜观察到的快速X射线瞬变。如果在单个CCD框架内检测到三个或更多的光子在静态背景的点传功能区域内的单个CCD框架中检测到三个或更多的光子，则它们可能具有统计学意义。在Chandra档案中，在歧视宇宙射线和背景耀斑和对误报的控制之后，从没有点式来源的地区发现了11个事件。其中，两个在空间上与银河系相吻合，一个与麦哲伦云的小物体相吻合，另一个则是M31。其余的没有或昏暗的光学对应物（$ \ gtrsim 20 $ mag），并且没有在银河平面上聚集。讨论了快速瞬变的可能物理起源，包括短伽马射线爆发（GRB），由中子星的合并产生的短寿命的过度量中性星星，在静态状态，磁场和恒星耀斑中积聚紧凑的物体。根据短的GRB事件速率密度，我们希望已检测到$ 2.3 _ { - 0.6}^{+0.7} $此类事件在Chandra Archive中。这种方法还可以使我们能够揭示只有几个光子的静态黑洞。
We propose a new method to identify rapid X-ray transients observed with focusing telescopes. They could be statistically significant if three or more photons are detected with Chandra in a single CCD frame within a point-spread-function region out of quiescent background. In the Chandra archive, 11 such events are discovered from regions without point-like sources, after discrimination of cosmic rays and background flares and control of false positives. Among them, two are spatially coincident with extended objects in the Milky Way, one with the Small Magellanic Cloud, and another one with M31; the rest have no or a dim optical counterpart ($\gtrsim 20$ mag), and are not clustered on the Galactic plane. Possible physical origins of the rapid transients are discussed, including short gamma-ray bursts (GRBs), short-lived hypermassive neutron stars produced by merger of neutron stars, accreting compact objects in the quiescent state, magnetars, and stellar flares. According to the short GRB event rate density, we expect to have detected $2.3_{-0.6}^{+0.7}$ such events in the Chandra archive. This method would also allow us to reveal quiescent black holes with only a few photons.
