A pilot ASKAP survey for radio transients towards the Galactic Centre
A pilot ASKAP survey for radio transients towards the Galactic Centre
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针对银河系中心的无线电瞬变进行 ASKAP 试点调查
DOI：
10.1093/mnras/stac2542
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发表时间：
2022
影响因子：
4.8
通讯作者：
Stewart, Adam J.
中科院分区：
文献类型：
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作者：
Wang, Ziteng;Murphy, Tara;Kaplan, David L.;Bannister, Keith W.;Lenc, Emil;Leung, James K.;O’Brien, Andrew;Pintaldi, Sergio;Pritchard, Joshua;Stewart, Adam J.
我们介绍了一项朝向银河中心的射电瞬变和偏振调查的结果，该调查是澳大利亚平方公里阵列探路器变量和慢瞬变试验调查的一部分。调查区域由5个领域组成，涵盖3,500个≲L≲100，|b|≲100)。每个视野观察12 分钟，重复7至9次，节奏为1天至4个月。我们探测到8个高度可变的信号源和7个高度圆极化的信号源(总共14个独特的信号源)。这些来源中有7个是已知的脉冲星，包括J1739-2521的旋转射电瞬变PSR和J1723-2837的食脉冲星PSR。其中之一是低质量X射线双星4U 1758-25。其中三个与光学或红外源重合，很可能是恒星。剩下的三个可能与银河中心射电瞬变的类别有关(包括之前报道的极有可能的一种，巨大的J173608.2-321634)，尽管这一类别尚不清楚。在接下来的几年里，如果这种源在银河系磁场上的分布是各向同性的，我们希望通过拟议的为期4年的大规模调查来探测到这类源的∼40爆发。
We present the results of a radio transient and polarization 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(350○≲l≲ 10○, |b| ≲ 10○). Each field was observed for 12 min, 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 polarized 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 ∼40 bursts from this kind of source with the proposed 4-yr VAST survey if the distribution of the source is isotropic over the Galactic fields.