Quasar Mesolensing : Direct Probe to Substructures around Galaxies
Quasar Mesolensing : Direct Probe to Substructures around Galaxies
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类星体介观透镜：直接探测星系周围的子结构
DOI：
10.1093/pasj/55.6.1059
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
R. University
中科院分区：
文献类型：
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作者：
A. Yonehara;M. Umemura;Hajime Susa Department of Physics;U. Tsukuba;JSPSFellow;I. Physics;R. University
最近，人们正在讨论一场“清洁发展机制危机”。这场危机的要点是，基于清洁发展机制结构形成情景的宇宙N体模拟所呈现的子结构数量远远多于观测到的子结构数量。因此，对于这场危机来说，关键是要区分清洁发展机制的预期数量是否真的存在，而没有可检测到的辐射。在本文中，我们提出了一种利用引力透镜来探测这种不可见亚结构的新想法。在这里，我们考虑被前景星系引力透镜作用的类星体。透镜星系周围的子结构可能会叠加在此类类星体的其中一个透镜图像上。在这种情况下，应该在子结构后面的图像中进行额外的图像分割，并且创建额外的多个图像。根据我们的估计，额外的多幅图像之间的间隔和时间延迟预计分别为1-30毫角秒和1-103秒。此外，我们还评估了这种事件∼的光学厚度为0.1.因此，未来的精细分辨率成像
Recently, a “CDM crisis” is being discussed. The main point of this crisis is that the number of substructures presented by cosmological N-body simulations based on the CDM scenario for structure formation is much larger than the observed substructures. Therefore, it is crucial for this crisis to discriminate whether the expected number of CDM substructures really exist without detectable radiation, or do not exist. In this paper, we present a new idea to detect such invisible substructures by utilizing gravitational lensing. Here, we consider quasars that are gravitationally lensed by a foreground galaxy. A substructure around a lensing galaxy may superposed on one of the lensed images of such quasars. In this situation, additional image splitting should occur in the image behind the substructure, and additional multiple images are created. From our estimations, the separation and time delay between the additional multiple images are expected to be 1–30 milli-arcsecond and 1–10 3 second, respectively. Furthermore, we evaluatethat the optical depth for such eventsis ∼0.1. Consequently, future fine-resolution imaging