DETERMINING X-RAY SOURCE INTENSITY AND CONFIDENCE BOUNDS IN CROWDED FIELDS
DETERMINING X-RAY SOURCE INTENSITY AND CONFIDENCE BOUNDS IN CROWDED FIELDS
复制标题
确定拥挤区域中的 X 射线源强度和置信区间
DOI：
10.1088/0004-637x/796/1/24
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
V. Kashyap
中科院分区：
文献类型：
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作者：
F. Primini;V. Kashyap
本文对高能天体物理光子计数图像中孔径测光的一般问题进行了严格的描述，其中统计噪声模型是泊松模型，而不是高斯模型。我们计算完整的后验概率密度函数的预期源强度的各种情况下的利益，包括重要的情况下，其中源和背景孔径包含来自源的贡献，当多个源孔径部分重叠。贝叶斯方法的优点是：（1）包含源强度的明确先验信息，（2）传播后验分布作为未来观测的先验，（3）使用泊松似然，使处理在低计数状态下有效。这种方法的元素已经在Chandra源目录中实现。
We present a rigorous description of the general problem of aperture photometry in high-energy astrophysics photon-count images, in which the statistical noise model is Poisson, not Gaussian. We compute the full posterior probability density function for the expected source intensity for various cases of interest, including the important cases in which both source and background apertures contain contributions from the source, and when multiple source apertures partially overlap. A Bayesian approach offers the advantages of allowing one to (1) include explicit prior information on source intensities, (2) propagate posterior distributions as priors for future observations, and (3) use Poisson likelihoods, making the treatment valid in the low-counts regime. Elements of this approach have been implemented in the Chandra Source Catalog.