暗物质毫米波成像与VSOP-2
Dark matter millilensing and VSOP-2
摘要：
根据冷暗物质的理论，在每个银河系大小的星系的晕圈中应该有大量的暗晕。探测这种暗晕的一个有希望的可能性是试图观察它们对背景源的引力透镜效应。太阳质量在10^6 - 10^10 M的暗物质暗晕会引起毫弧秒尺度的强引力透镜效应，这种效应只能用空间VLBI观测到.我们研究的可行性强透镜探测暗subhalos推导出的图像分离预期的密度分布赞成目前的模拟和比较它的角分辨率的现有和即将到来的观测设施。我们发现，subhalos的检测可能比以前的研究中提出的要困难得多，由于较小的图像分离预测subhalo密度分布更现实的奇异等温球模型往往采用。
英文摘要：
According to the cold dark matter scenario, a large number of dark subhalos should be located within the halo of each Milky-way sized galaxy. One promising possibility for detecting such subhalos is to try to observe their gravitational lensing effects on background sources. Dark matter subhalos in the 10^6 - 10^10 M_solar mass range should cause strong gravitational lensing on the (sub)milliarcsecond scales, which can be observed only using space VLBI. We study the feasibility of a strong-lensing detection of dark subhalos by deriving the image separations expected for density profiles favoured by current simulations and comparing it to the angular resolution of both existing and upcoming observational facilities. We show that the detection of subhalos is likely much more difficult than suggested in previous studies, due to the smaller image separations predicted for subhalo density profiles more realistic than the singular isothermal sphere models often adopted.
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