We present the results of the analysis of three XMM-Newton observations of the Willman 1 dwarf spheroidal galaxy (Wil 1). X-ray sources are classified on the basis of spectral analysis, hardness ratios, X-ray-to-optical flux ratio, X-ray variability, plus cross-correlation with available catalogues in optical and infrared wavelengths. We catalogued 97 sources in the field of Wil 1. Our classification shows the presence of a $\beta$-type symbiotic star in Wil 1. We classified one M dwarf foreground star in the field of Wil 1. Moreover, fifty-four sources are classified as background AGNs and galaxies. Our study shows that the luminosity of the X-ray sources of Wil 1 does not exceed $\sim$10$^{34}$ erg s$^{-1}$ in the energy range of 0.2--12.0 keV, which is similar to observed luminosities of sources in nearby dwarf spheroidal galaxies.

中文翻译：

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威尔曼 1 矮椭球星系 X 射线源的 XMM-牛顿研究*

我们展示了对 Willman 1 矮椭球星系（Wil 1）的三个 XMM-Newton 观测的分析结果。X 射线源根据光谱分析、硬度比、X 射线与光通量比、X 射线可变性以及与可用的光学和红外波长目录的互相关性进行分类。我们对 Wil 1 领域的 97 个来源进行了编目。我们的分类显示了 Wil 1 中存在 $\beta$ 型共生星。我们在 Wil 1 领域对一颗 M 矮前景星进行了分类。此外，还有 54 个来源被归类为背景 AGN 和星系。我们的研究表明，Wil 1 的 X 射线源的光度在 0.2--12.0 keV 的能量范围内不超过 $\sim$10$^{34}$ erg s$^{-1}$，即类似于观测到的附近矮椭球星系中光源的光度。