探测宇宙微波背景图中点源的两种改进的ILC方法
Two modified ILC methods to detect point sources in Cosmic Microwave Background maps
摘要：
我们提出了两种检测技术，利用一个小的天空面积近似和修改的“内部线性组合”（ILC）的方法，广泛用于宇宙学的各种组件的分离，有助于微波背景的方法。所提出的方法的主要优点，特别是在处理多频地图的同一地区，是它不需要的空间功率谱的CMB和/或银河系前景的“先验”知识。因此，它更强大，更容易和更直观的使用。所提出的算法的性能进行了测试，模拟的物理场景预计高银河系纬度观测与阿塔卡马大型毫米/亚毫米阵列（ALMA）的数值实验。
英文摘要：
We propose two detection techniques that take advantage of a small sky area approximation and are based on modifications of the "internal linear combination" (ILC) method, an approach widely used in Cosmology for the separation of the various components that contribute to the microwave background. The main advantage of the proposed approach, especially in handling multi-frequency maps of the same region, is that it does not require the "a priori" knowledge of the spatial power-spectrum of either the CMB and/or the Galactic foreground. Hence, it is more robust, easier and more intuitive to use. The performance of the proposed algorithms is tested with numerical experiments that mimic the physical scenario expected for high Galactic latitude observations with the Atacama Large Millimeter/submillimeter Array (ALMA).
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