利用强度涨落的引力透镜甚长基线干涉测量和观测：基于强度自相关的分析
Very long baseline interferometry and observations of gravitational lenses using intensity fluctuations: an analysis based on intensity autocorrelation
摘要：
最近推出了一种新型干涉测量技术，该技术使用二次探测器（天文学中常用的一种探测器）的电流波动光谱。它相对于经典干涉测量法具有很大的优势。它可以用来观察标准技术无法检测到的引力透镜。它可用于进行甚长基线干涉测量。虽然最初的理论分析，利用波的相互作用的影响，是严格的，它是不容易理解的。因此，本文进行了一个简单的分析，使用强度波动的自相关性，这是更容易理解的。它基于已发表的实验，这些实验是为了验证原始理论而进行的。自相关分析也验证了简单的数值技术，基于自相关，模拟源的角强度分布。自相关技术还允许更简单的信号检测。在实践中，引力透镜的应用是那些可以很容易地与目前可用的望远镜。我们描述了一个实际的例子，表明目前可用的VLBI射电天文数据可以用来观察macrolensed类星体的microlensingandmillilensing。它们可能提供透镜星系中暗物质亚结构的信息。
英文摘要：
A novel interferometric technique that uses the spectrum of the current fluctuations of a quadratic detector, a type of detector commonly used in Astronomy, has recently been introduced. It has major advantages with respect to classical interferometry. It can be used to observe gravitational lenses that cannot be detected with standard techniques. It can be used to carry out very long baseline interferometry. Although the original theoretical analysis, that uses wave interaction effects, is rigorous, it is not easy to understand. The present article therefore carries out a simpler analysis, using the autocorrelation of intensity fluctuations, which is easier to understand. It is based on published experiments that were carried out to validate the original theory. The autocorrelation analysis also validates simple numerical techniques, based on the autocorrelation, to model the angular intensity distribution of a source. The autocorrelation technique also allows a much simpler detection of the signal. In practice, the gravitational lens applications are the ones that can readily be done with presently available telescopes. We describe a practical example that shows that presently available VLBI radio-astronomical data can be used to observe microlensisng and millilensing in macrolensed Quasars. They may give information on the dark matter substructures in the lensing galaxies.
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