论文标题

一种新型的机器学习方法,用于解散星系簇中的多温区域

A Novel Machine Learning Approach to Disentangle Multi-Temperature Regions in Galaxy Clusters

论文作者

Rhea, Carter L., Hlavacek-Larrondo, Julie, Perreault-Levasseur, Laurence, Gendron-Marsolais, Marie-Lou, Kraft, Ralph

论文摘要

星系簇心脏周围的热集内培养基(ICM)是一种复杂的培养基,由各种发射组成。尽管先前对附近星系簇(例如珀尔修斯,昏迷或处女座簇)的研究表明,当光谱上拟合ICM的X射线发射时,不需要多个热成分,但没有用于计算当前存在的潜在组件数量的系统方法。反过来,低估或高估组件的数量可能会导致发射参数估计中的系统错误。在本文中,我们提出了一种新的方法,可以使用机器学习技术的合并来确定组件数量。使用\ textIt {chandra} X射线天文台可用的良好工具创建了包含各种基础热成分的合成光谱。最初,使用主成分分析缩小了训练集的尺寸,然后根据使用随机森林分类器的基础组件数量进行分类。随后,我们的训练有素和测试的算法应用于Perseus群集的\ textit {Chandra} X射线观测值。我们的结果表明,机器学习技术可以有效,可靠地估算出星系簇光谱中的基础热成分的数量,而不论热模型如何(MEKAL与APEC)。使用的%和信噪比。我们还确认,珀尔修斯群集的核心包含不同基础热成分的混合物。我们强调的是,尽管该方法是在\ textit {chandra} X射线观测上进行了训练和应用的,但它很容易移植到其他电流(例如Xmm-Newton,erosita)和即将到来的(例如Athena,Lynx,Xrism,Xrism)X射线望远镜。该代码可在\ url {https://github.com/xtraastronomy/pumpkin}上公开获得。

The hot intra-cluster medium (ICM) surrounding the heart of galaxy clusters is a complex medium comprised of various emitting components. Although previous studies of nearby galaxy clusters, such as the Perseus, the Coma, or the Virgo cluster, have demonstrated the need for multiple thermal components when spectroscopically fitting the ICM's X-ray emission, no systematic methodology for calculating the number of underlying components currently exists. In turn, underestimating or overestimating the number of components can cause systematic errors in the emission parameter estimations. In this paper, we present a novel approach to determining the number of components using an amalgam of machine learning techniques. Synthetic spectra containing a various number of underlying thermal components were created using well-established tools available from the \textit{Chandra} X-ray Observatory. The dimensions of the training set was initially reduced using the Principal Component Analysis and then categorized based on the number of underlying components using a Random Forest Classifier. Our trained and tested algorithm was subsequently applied to \textit{Chandra} X-ray observations of the Perseus cluster. Our results demonstrate that machine learning techniques can efficiently and reliably estimate the number of underlying thermal components in the spectra of galaxy clusters, regardless of the thermal model (MEKAL versus APEC). %and signal-to-noise ratio used. We also confirm that the core of the Perseus cluster contains a mix of differing underlying thermal components. We emphasize that although this methodology was trained and applied on \textit{Chandra} X-ray observations, it is readily portable to other current (e.g. XMM-Newton, eROSITA) and upcoming (e.g. Athena, Lynx, XRISM) X-ray telescopes. The code is publicly available at \url{https://github.com/XtraAstronomy/Pumpkin}.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源