解开ICL与CHEF：Abell 2744作为案例研究
Disentangling the ICL with the CHEFs: Abell 2744 as a case study
摘要：
团簇内光（ICL）的测量仍然容易产生方法上的模糊性，文献中有多种用于此目的的技术，主要基于结合能，局部密度分布或表面亮度。这些方法的一个共同问题是对ICL形态、其表面亮度水平或最亮星系团（BCG）的某些特性的一些假设的先验假设。结果的差异是很大的，数值模拟只是限制了ICL的分数在当今的星系团的范围为10- 50%。我们开发了一种新的算法的基础上的切比雪夫傅立叶函数（CHEFs）来估计ICL分数，而不依赖于任何先验假设的物理或几何特征的ICL。我们不仅能够从星系光度中分离出ICL，而且能够以自然的方式从ICL中标出BCG的极限。我们使用Frontier Fields计划观察到的Abell 2744星系团最近发布的数据来测试我们的技术。这种多合并聚类系统的复杂性和这些图像的强大深度使其成为一个具有挑战性的测试案例，以证明我们的算法的效率。我们发现最终ICL分数为19.17 ± 2.87%，这与数值模拟非常一致。
英文摘要：
Measurements of the intracluster light (ICL) are still prone to methodological ambiguities and there are multiple techniques in the literature for that purpose, mostly based on the binding energy, the local density distribution, or the surface brightness. A common issue with these methods is the a priori assumption of a number of hypotheses on either the ICL morphology, its surface brightness level or some properties of the brightest cluster galaxy (BCG). The discrepancy on the results is high, and numerical simulations just bound the ICL fraction in present-day galaxy clusters to the range 10-50%. We developed a new algorithm based on the Chebyshev-Fourier functions (CHEFs) to estimate the ICL fraction without relying on any a priori assumption on the physical or geometrical characteristics of the ICL. We are able to not only disentangle the ICL from the galatic luminosity but mark out the limits of the BCG from the ICL in a natural way. We test our tecnique with the recently released data of the cluster Abell 2744, observed by the Frontier Fields program. The complexity of this multiple merging cluster system and the formidable depth of these images make it a challenging test case to prove the efficiency of our algorithm. We found a final ICL fraction of 19.17+-2.87%, which is very consistent with numerical simulations.
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