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arXiv 1908.00231astro-ph.IM
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具有角分辨率增强器的X射线望远镜系统的概念

A concept for the X-ray telescope system with an angular-resolution booster

Yoshitomo Maeda, Ryo Iizuka, Takayuki Hayashi, Toshiki Sato, Nozomi Nakaniwa, Mai Takeo, Hitomi Suzuki, Manabu Ishida, Shiro Ikeda, Mikio Morii

摘要:

提出了一种高角分辨率、中等灵敏度的X射线成像系统的概念。在这个概念中,二维检测器,即,成像器被放置在聚焦镜的稍微离焦的位置,而不是像标准光学器件那样仅仅在镜焦点处,以捕获物体的微型图像。此外,在望远镜的前面安装了一组多重网格掩模(或调制准直器)。我们发现掩模作为编码孔径相机工作,并且它们提高了聚焦光学器件的角分辨率。这个概念的主要优点是,一个更好的角分辨率的数量级2- 3或更高的比在传统的光学是可以实现的,而高吞吐量(大的有效面积)被保持,这是至关重要的光子有限的高能天文学,因为任何类型的镜子,包括重量轻的反射镜,可以在我们的概念中使用。如果信噪比足够高,我们估计,在衍射极限处,在约7 keV下,分别以1 μ m和100 μ m的间隔使用一对掩模可以实现4”和0“4的衍射极限处的角分辨率。

英文摘要:

We present a concept of the X-ray imaging system with high angular-resolution and moderate sensitivity. In this concept, a two-dimensional detector, i.e., imager, is put at a slightly out-of-focused position of the focusing mirror, rather than just at the mirror focus as in the standard optics, to capture the miniature image of objects. In addition, a set of multi-grid masks (or a modulation collimator) is installed in front of the telescope. We find that the masks work as a coded aperture camera and that they boost the angular resolution of the focusing optics. The major advantage of this concept is that a much better angular resolution an order of 2--3 or more than in the conventional optics is achievable, while a high throughput (large effective area) is maintained, which is crucial in photon-limited high-energy astronomy, because any type of mirrors, including light-weight reflective mirrors, can be employed in our concept. If the signal-to-noise ratio is sufficiently high, we estimate that angular resolutions at the diffraction limit of 4" and 0"4 at about 7 keV can be achieved with a pair of masks at separations of 1~m and 100~m, respectively, at the diffraction limit.

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