用于X射线天体物理学的HaloSat和PolarLight CubeSat任务
The HaloSat and PolarLight CubeSat Missions for X-ray Astrophysics
AI总结：
本文介绍HaloSat和PolarLight两个CubeSat任务，展示其在X射线天体物理学中的有效平台能力及学生训练价值。
摘要：
X射线波段的天文观测受大气衰减影响，必须在太空中进行。CubeSat为天基X射线天体物理学提供了高性价比的手段，但其质量和体积有限。本文描述了两次成功的基于CubeSat的任务：HaloSat和PolarLight，两者均对keV能段敏感。HaloSat是一颗6U CubeSat，配备硅漂移探测器。它进行了氧线辐射的全天巡天，揭示了银河系周围星系周介质的团块性质。PolarLight是一台专用X射线偏振计，在1U有效载荷中使用气体像素探测器进行光电子追踪。它观测了最亮的X射线天体，帮助限制了其磁场或吸积几何结构。这两个任务多年的在轨运行证明了CubeSat作为有效天文平台的能力。任务开发与建造的快速周期使其在学生训练方面尤为具有吸引力。
英文摘要：
Astronomical observations in the X-ray band are subject to atmospheric attenuation and have to be performed in the space. CubeSats offer a cost effective means for space-based X-ray astrophysics but allow only limited mass and volume. In this article, we describe two successful CubeSat-based missions, HaloSat and PolarLight, both sensitive in the keV energy range. HaloSat was a 6U CubeSat equipped with silicon drift detectors. It conducted an all-sky survey of oxygen line emission and revealed the clumpy nature of the circumgalactic medium surrounding the Milky Way. PolarLight is a dedicated X-ray polarimeter performing photoelectron tracking using a gas pixel detector in a 1U payload. It observed the brightest X-ray objects and helped constrain their magnetic field or accretion geometry. On-orbit operation of both missions for multiple years demonstrates the capability of CubeSats as an effective astronomical platforms. The rapid time scales for development and construction of the missions makes them particularly attractive for student training.
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