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arXiv 0909.0966astro-ph.IM
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EXIST上的高能望远镜

The High Energy Telescope on EXIST

J. Hong, J. E. Grindlay, B. Allen, S. D. Barthelmy, G. K. Skinner, N. Gehrels, the EXIST HET Working Group

摘要:

高能X射线成像巡天望远镜(EXIST)是一项拟议中的下一代多波长巡天任务。主要仪器是一台高能望远镜,对伽马射线暴、暗吸积和休眠超大质量黑洞以及各种瞬变现象进行最深的调查,以便由两台辅助仪器立即进行后续研究:一台软X射线成像仪和一台光学/红外望远镜。EXIST将使用高红移伽玛暴作为宇宙探测器探索早期宇宙,并调查所有尺度的黑洞。HET是一种编码孔径望远镜,采用大阵列成像CZT探测器(4.5 m^2,0.6 mm像素)和混合钨掩模。我们回顾了目前的HET概念,它遵循了密集的设计修改的HET成像工作组和最近的工程研究在戈达德航天飞行中心的仪器和任务设计实验室。HET将快速(<10-30秒)和准确(< 20”)定位伽马射线暴和瞬变,以便快速(< 1-3分钟)跟踪机载软X射线和光学/IR(0.3-2.2微米)成像和光谱学。宽的能带(5-600 keV)和宽的视场(~90度× 70度,10%编码分数)是捕捉伽玛暴,模糊的活动星系核和罕见的瞬变的最佳选择。每3小时对整个天空的连续扫描将建立许多X射线源的精细采样长期历史,为可变性研究开辟新的可能性。

英文摘要:

The Energetic X-ray Imaging Survey Telescope (EXIST) is a proposed next generation multi-wavelength survey mission. The primary instrument is a High Energy telescope (HET) that conducts the deepest survey for Gamma-ray Bursts (GRBs), obscured-accreting and dormant Supermassive Black Holes and Transients of all varieties for immediate followup studies by the two secondary instruments: a Soft X-ray Imager (SXI) and an Optical/Infrared Telescope (IRT). EXIST will explore the early Universe using high redshift GRBs as cosmic probes and survey black holes on all scales. The HET is a coded aperture telescope employing a large array of imaging CZT detectors (4.5 m^2, 0.6 mm pixel) and a hybrid Tungsten mask. We review the current HET concept which follows an intensive design revision by the HET imaging working group and the recent engineering studies in the Instrument and Mission Design Lab at the Goddard Space Flight Center. The HET will locate GRBs and transients quickly (<10-30 sec) and accurately (< 20") for rapid (< 1-3 min) onboard followup soft X-ray and optical/IR (0.3-2.2 micron) imaging and spectroscopy. The broad energy band (5-600 keV) and the wide field of view (~90 deg x 70 deg at 10% coding fraction) are optimal for capturing GRBs, obscured AGNs and rare transients. The continuous scan of the entire sky every 3 hours will establish a finely-sampled long-term history of many X-ray sources, opening up new possibilities for variability studies.

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