由卡内基梅隆大学 McWilliams 宇宙学与天体物理中心的研究人员参与的一个国际科学家团队，发现了与快速射电暴（fast radio bursts; FRB）相关的持续射电辐射的起源。研究表明，这些辐射由围绕 FRB 20201124A 源的等离子体泡生成，该源距离地球13亿光年，可能与磁星或高吸积 X 射线双星有关。此次研究受意大利国家天体物理研究所（INAF）的 Luigi Piro 和卡内基梅隆大学 McWilliams 博士后研究员 Brendan O'Connor 早期工作的启发，他们利用 VLA (Very Large Array Radio Telescope)、NOEMA (Northern Extended Millimeter Array) 和 CANARIAS 大望远镜的高空间分辨率数据，成功将两种现象联系起来，推动了我们对这些宇宙现象的理解。研究结果已发表在《自然》杂志上。
An international team of scientists, including a researcher from Carnegie Mellon University's McWilliams Center for Cosmology and Astrophysics, has identified the origin of persistent radio emissions associated with fast radio bursts (FRBs). The study reveals that these emissions are generated by a plasma bubble surrounding the source of FRB 20201124A, located 1.3 billion light-years away, possibly linked to a magnetar or a high-accretion X-ray binary. Motivated by earlier work led by Luigi Piro of INAF and Brendan O'Connor, a McWilliams Postdoctoral Fellow, this new research utilized higher spatial resolution data from the VLA ( Very Large Array Radio Telescope), NOEMA (Northern Extended Millimeter Array), and the Gran Telescopio CANARIAS to make the connection, advancing our understanding of these cosmic phenomena. The findings were published in Nature.
了解更多 | Learn More:
https://www.cmu.edu/news/stories/archives/2024/August/origin-fast-radio-bursts
卡内基梅隆大学的研究人员 Brandon Tober，与来自卡内基梅隆大学、阿拉斯加大学费尔班克斯分校和亚利桑那大学的研究团队一起，进行了地面和空中冰层穿透调查，以绘制阿拉斯加 Wrangell-St. Elias 国家公园内 Root 冰川的厚度和基岩高度图。与国家公园管理局合作，他们的目标是解决与冰川变薄和退缩相关的环境问题。地面调查虽然范围有限，仅集中在冰川最常被踏足的区域，但后来验证了空中调查的结果。与此同时，直升机雷达在仅三天内覆盖了550公里的调查区域。收集的数据将有助于预测冰川变化、制作区域地图和评估可能的危险，如洪水，从而指导未来的基础设施规划。
Brandon Tober from Carnegie Mellon University, together with a research team from CMU, the University of Alaska Fairbanks, and the University of Arizona, performed ground and aerial ice-penetrating surveys to map the thickness and bedrock elevation of Root Glacier in Wrangell-St. Elias National Park, Alaska. In collaboration with the National Park Service, their goal is to address environmental challenges related to the glacier's thinning and retreat. The ground surveys, which were limited to the most frequented areas of the glacier, later confirmed the findings of the aerial surveys. In contrast, helicopter-borne radar covered 550 kilometers in just three days. The collected data will be instrumental in forecasting glacier changes, creating regional maps, and evaluating potential hazards such as outburst floods, thereby informing future infrastructure planning.
了解更多 | Learn More:
https://www.cmu.edu/news/stories/archives/2024/august/researchers-map-alaskas-glaciers-from-above
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