High angular resolution imaging with stellar intensity interferometry using air Cherenkov telescope arrays
High angular resolution imaging with stellar intensity interferometry using air Cherenkov telescope arrays
复制标题
使用空气切伦科夫望远镜阵列通过恒星强度干涉测量进行高角分辨率成像
DOI：
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发表时间：
2011
期刊：
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通讯作者：
S. LeBohec
中科院分区：
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作者：
P. Nuñez;R. Holmes;D. Kieda;S. LeBohec
由近100架望远镜组成的空气切伦科夫望远镜阵列的光学恒星强度干涉测量，将提供测量基本恒星参数的手段，并开启不依赖模型成像的可能性。除了灵敏度问题外，强度干涉测量中图像恢复的一个主要限制是测量过程中复杂相干度的相位损失。然而，已经开发了几种与模型无关的相位重建技术。在这里，我们实现了一种基于柯西-黎曼的算法来从模拟数据中恢复图像。对于曝光时间为几小时的明亮恒星（mv - 6），我们发现重建的尺度特征，如直径、扁率和整体形状，不确定性只有几个百分点。更复杂的图像也可以很好地重建，与原始图像具有高度的相关性。使用前向算法进一步改善了结果。
Optical stellar intensity interferometry with air Cherenkov telescope arrays, composed of nearly 100 telescopes, will provide means to measure fundamental stellar parameters and also open the possibility of model-independent imaging. In addition to sensitivity issues, a main limitation of image recovery in intensity interferometry is the loss of phase of the complex degree of coherence during the measurement process. Nevertheless, several model-independent phase reconstruction techniques have been developed. Here we implement a Cauchy-Riemann based algorithm to recover images from simulated data. For bright stars (mv � 6) and exposure times of a few hours, we find that scale features such as diameters, oblateness and overall shapes are reconstructed with uncertainties of a few percent. More complex images are also well reconstructed with high degrees of correlation with the pristine image. Results are further improved by using a forward algorithm.