来自明亮的长周期无线电瞬态的X射线发射的检测
Ziteng Wang1, Nanda Rea2,3, Tong Bao4
1International Centre for Radio Astronomy Research, Curtin University, Bentley, Western Australia, Australia. ziteng.wang@curtin.edu.au.
Nature
|May 28, 2025
概括
天文学家发现了一种新型的有能量宇宙物体,长周期无线电瞬态 (LPT),它既发射无线电信号又发射X射线信号. 这一发现挑战了现有的模型,
科学领域:
- 天文学与天体物理学
- 高能天体物理学
- 无线电天文学
背景情况:
- 长周期无线电瞬态 (LPT) 是新发现的宇宙源,其发射持续时间远远超过典型的无线电脉冲星.
- 之前的搜索未能发现LPT的X射线对应物, 尽管理论上的预测.
- 广场无线电调查的进步对于识别这些神秘物体至关重要.
研究的目的:
- 为了报道新发现, 极其明亮的LPT与相应的无线电和X射线发射.
- 描述这个新源的观测特性,并与现有的天体物理模型进行比较.
- 建立一个与连贯无线电辐射相关的新类X射线瞬态.
主要方法:
- 使用先进的无线电望远镜进行广场调查以检测LPT.
- 进行后续观察以确定X射线对应物.
- 分析了相关的无线电和X射线发射特性,包括周期性和可变性.
主要成果:
- 发现了一个非常明亮的LPT,ASKAP J1832-0911,其无线电亮度为10-20 Jy.
- 检测到来自源的同时发生的无线电和X射线发射, 周期为44.2分钟.
- 观察到与已知银河系物体不一致的相关且高度可变的X射线和无线电发光度.
结论:
- 这些发现表明LPT比先前的假设更有活力.
- 源头可能是老磁星或超磁化白矮星, 尽管理论上的挑战仍然存在.
- 建立了一个具有高亮度和明亮无线电辐射的小时级周期性X射线短变物.
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