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XL-Calibur – a second-generation balloon-borne hard X-ray polarimetry mission
Astroparticle Physics ( IF 4.2 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.astropartphys.2020.102529
Q. Abarr , H. Awaki , M.G. Baring , R. Bose , G. De Geronimo , P. Dowkontt , M. Errando , V. Guarino , K. Hattori , K. Hayashida , F. Imazato , M. Ishida , N.K. Iyer , F. Kislat , M. Kiss , T. Kitaguchi , H. Krawczynski , L. Lisalda , H. Matake , Y. Maeda , H. Matsumoto , T. Mineta , T. Miyazawa , T. Mizuno , T. Okajima , M. Pearce , B.F. Rauch , F. Ryde , C. Shreves , S. Spooner , T.-A. Stana , H. Takahashi , M. Takeo , T. Tamagawa , K. Tamura , H. Tsunemi , N. Uchida , Y. Uchida , A.T. West , E.A. Wulf , R. Yamamoto

Abstract XL-Calibur is a hard X-ray (15-80 keV) polarimetry mission operating from a stabilised balloon-borne platform in the stratosphere. It builds on heritage from the X-Calibur mission, which observed the accreting neutron star GX 301 - 2 from Antarctica, between December 29th 2018 and January 1st 2019. The XL-Calibur design incorporates an X-ray mirror, which focusses X-rays onto a polarimeter comprising a beryllium rod surrounded by Cadmium Zinc Telluride (CZT) detectors. The polarimeter is housed in an anticoincidence shield to mitigate background from particles present in the stratosphere. The mirror and polarimeter-shield assembly are mounted at opposite ends of a 12 m long lightweight truss, which is pointed with arcsecond precision by WASP – the Wallops Arc Second Pointer. The XL-Calibur mission will achieve a substantially improved sensitivity over X-Calibur by using a larger effective area X-ray mirror, reducing background through thinner CZT detectors, and improved anticoincidence shielding. When observing a 1 Crab source for t day days, the Minimum Detectable Polarisation (at 99% confidence level) is ∼ 2 % · t day − 1 / 2 . The energy resolution at 40 keV is ∼ 5.9 keV. The aim of this paper is to describe the design and performance of the XL-Caliburmission, as well as the foreseen science programme.

中文翻译:

XL-Calibur – 第二代气球携带硬 X 射线偏振测量任务

摘要 XL-Calibur 是一项硬 X 射线 (15-80 keV) 偏振测量任务,在平流层中的稳定气球承载平台上运行。它建立在 X-Calibur 任务的基础之上,该任务在 2018 年 12 月 29 日至 2019 年 1 月 1 日期间从南极洲观测到吸积中子星 GX 301-2。 XL-Calibur 设计包含一个 X 射线镜,可聚焦 X 射线到一个旋光计上,该旋光计包括一个由碲化镉锌 (CZT) 检测器包围的铍棒。旋光仪安装在反重合罩中,以减轻来自平流层中存在的粒子的背景。反射镜和旋光仪护罩组件安装在 12 m 长的轻型桁架的两端,该桁架由 WASP - Wallops Arc Second Pointer 以弧秒精度指向。XL-Calibur 任务将通过使用更大的有效面积 X 射线镜、通过更薄的 CZT 探测器减少背景以及改进的反重合屏蔽,实现比 X-Calibur 显着提高的灵敏度。当观察 1 个 Crab 源 t 天时,最小可检测极化(99% 置信水平)为 ∼ 2 % · t day − 1 / 2 。40 keV 的能量分辨率为~ 5.9 keV。本文的目的是描述 XL-Caliburmission 的设计和性能,以及可预见的科学计划。40 keV 的能量分辨率为~ 5.9 keV。本文的目的是描述 XL-Caliburmission 的设计和性能,以及可预见的科学计划。40 keV 的能量分辨率为~ 5.9 keV。本文的目的是描述 XL-Caliburmission 的设计和性能,以及可预见的科学计划。
更新日期:2021-03-01
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