Future Hard X-ray and Gamma-ray Observations
Future Hard X-ray and Gamma-ray Observations
复制标题
未来的硬 X 射线和伽马射线观测
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
K. Makishima
中科院分区：
文献类型：
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作者：
Tadayuki Takahashi;T. Kamae;K. Makishima
硬X射线和伽马射线是探索高能宇宙的重要频率窗口。正是在这些能带中，非热发射成为主导，主要是由加速的高能粒子引起的。事实上，结果表明，在这些波段的敏感观测是必要的，以限制许多类别的X射线源的连续谱。然而，缺乏灵敏的仪器阻碍了我们对非热谱的进一步研究。如图1所示，硬X射线和软伽马射线波段的情况要糟糕得多，这些波段的本底很难降低。该卫星揭示了天空中存在各种伽马射线源的事实，卫星提高了角度和光谱分辨率将是一个很好的进步，但仪器的灵敏度远远达不到目前使用10keV以下能带聚焦望远镜的X射线任务所达到的水平。为了充分探索动态宇宙，21世纪的硬X射线和伽马射线仪器应该比目前使用的仪器提供更高的点源和扩展源的灵敏度。
Hard X-rays and gamma-rays are important frequency windows for expoloring the energetic universe. It is in these energy bands that the non-thermal emission, mostly due to accelerated high energy particles, becomes dominant. In fact, the results from and showed that sensitive observations in these bands are necessary to constrain the continuum spectra of many classes of X-ray sources. However, the lack of sensitive instruments prevents us from further studying the non-thermal spectra. As clearly shown in Fig.1, the situation is much worse in the hard X-ray and soft gamma-ray bands, where the reduction of background is difficult. The satellite revealed the fact that a variety of gamma-ray sources exist in the sky and the improved angular and spectral resolution by the satellite will be a good advance, but the sensitivity of instruments are far from the level achieved by the current X-ray missions employing focusing telescopes in the energy band below 10 keV. In order to fully explore the dynamic universe, hard X-ray and gamma-ray instruments in the 21st century should provide much improved sensitivity for both point and extended sources over the instrumens in use today.