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arXiv 1108.4682astro-ph.IMastro-ph.SR
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利用空气切伦科夫望远镜阵列进行恒星强度干涉测量的高角分辨率成像

High angular resolution imaging with stellar intensity interferometry using air Cherenkov telescope arrays

Paul D. Nunez, Richard Holmes, David Kieda, Stephan LeBohec

摘要:

利用由近100台望远镜组成的空气切伦科夫望远镜阵列进行的恒星强度光学干涉测量,将提供测量基本恒星参数的手段,并开辟独立于模型成像的可能性。除了灵敏度问题之外,强度干涉测量中的图像恢复的主要限制是在测量过程期间相干的复杂程度的相位的损失。然而,已经开发了几种模型无关的相位重建技术。在这里,我们实现了一个基于Cauchy-Riemann的算法,从模拟数据中恢复图像。对于明亮的恒星(m_v~6)和几个小时的曝光时间,我们发现,尺度特征如直径、扁率和整体形状的重建具有百分之几的不确定性。更复杂的图像也被很好地重建,具有与原始图像的高度相关性。通过使用前向算法,结果得到进一步改善。

英文摘要:

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 (m_v~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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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