论文标题
一项针对银河中心的无线电瞬态的飞行员ASKAP调查
A pilot ASKAP survey for radio transients towards the Galactic Centre
论文作者
论文摘要
我们介绍了向银河中心进行的无线电瞬时和极化调查的结果，该调查是澳大利亚平方公里阵列探路者变量的一部分和慢速瞬态试验调查的结果。调查区域由五个覆盖$ \ sim265 \，{\ rm veg}^2 $（$ 350^\ circ \ sirce \ sillsim l \ sillssim10^\ circ $，$ \ vert b \ vert b \ vert \ vert \ lyssim 10^\ circ $）组成。观察到每个磁场12 \，分钟，在一天至四个月之间的节奏中，重复7到9个。我们检测到八个高度可变的来源和七个高度圆形的源（总共14个独特的来源）。这些来源中有七个是已知的脉冲星，包括旋转无线电瞬态PSR〜J1739--2521和Eclipsing Pulsar PSR〜J1723--2837。其中之一是低质量X射线二进制，4U 1758--25。其中三个与光学或红外源相吻合，可能是恒星。剩下的三个可能与银河中心无线电瞬变类别有关（包括一个以前已经报道的很可能的〜J173608.2---321634），尽管尚未了解此类。在接下来的几年中，如果源在银河场上是各向同性的，我们预计将从这种来源中检测到$ \ sim $ 40爆发。
We present the results of a radio transient and polarisation survey towards the Galactic Centre, conducted as part of the Australian Square Kilometre Array Pathfinder Variables and Slow Transients pilot survey. The survey region consisted of five fields covering $\sim265\,{\rm deg}^2$ ($350^\circ\lesssim l\lesssim10^\circ$, $\vert b\vert \lesssim 10^\circ$). Each field was observed for 12\,minutes, with between 7 and 9 repeats on cadences of between one day and four months. We detected eight highly variable sources and seven highly circularly-polarised sources (14 unique sources in total). Seven of these sources are known pulsars including the rotating radio transient PSR~J1739--2521 and the eclipsing pulsar PSR~J1723--2837. One of them is a low mass X-ray binary, 4U 1758--25. Three of them are coincident with optical or infrared sources and are likely to be stars. The remaining three may be related to the class of Galactic Centre Radio Transients (including a highly likely one, VAST~J173608.2--321634, that has been reported previously), although this class is not yet understood. In the coming years, we expect to detect $\sim$40 bursts from this kind of source with the proposed four-year VAST survey if the distribution of the source is isotropic over the Galactic fields.
