论文标题
雕塑家矮人球形星系的XMM-Newton研究
XMM-Newton study of the Sculptor dwarf spheroidal galaxy
论文作者
论文摘要
我们在雕塑家矮人球形星系（DSPH）领域中用XMM-Newton进行了观察。该研究的目的是X射线二进制文件的分类和属于雕塑家DSPH的白色矮人。使用X射线计时和光谱分析的不同方法，以及对X射线源的光学和红外对应物进行的广泛多波长研究，我们对雕塑家DSPH领域中XMM-Newton检测到的来源进行了分类。已经在两个\ xmm \观察结果上研究了来源的长期变异性。雕塑家DSPH的成员在这两个观察结果中没有显示出显着的长期变异性。我们还使用Lomb-Scargle和Rayleigh的Z_N^2技术搜索了周期性和脉动。 X射线源未发现脉动或周期性的信号。结果表明，该星系领域中存在明显数量的背景X射线源。我们将43个来源分类为活性银河核（AGN），星系和星系候选物。雕塑家DSPH领域已经确定了三个银河前景恒星，其中一颗是M-warf候选人。此外，我们在雕塑家DSPH中将四个共生星候选人和三个静态的低质量X射线二进制候选者分类。这些X射线源的光度为10^{33-35} erg/s。
We analysed observations with XMM-Newton in the field of the Sculptor dwarf spheroidal galaxy (dSph). The aim of the study was the classification of X-ray binaries and accreting white dwarfs, which belong to the Sculptor dSph. Using different methods of X-ray timing and spectral analyses, together with an extensive multi-wavelength study of the optical and infrared counterparts of the X-ray sources, we classified the sources detected with XMM-Newton in the field of Sculptor dSph. The long term variability of the sources has been studied over two \xmm\, observations. None of the members of Sculptor dSph show a significant long-term variability over these two observations. We also searched for periodicity and pulsation using the Lomb-Scargle and Rayleigh's Z_n^2 techniques. No signal of pulsation or periodicity have been found for the X-ray sources. The results show the presence of a noticeable number of background X-ray sources in the field of this galaxy. We classified 43 sources as active galactic nuclei (AGNs), galaxies, and galaxy candidates. Three Galactic foreground stars have been identified in the field of Sculptor dSph, and one of them is an M-dwarf candidate. Moreover, we classified four symbiotic star candidates and three quiescent low-mass X-ray binary candidates in Sculptor dSph. The luminosity of these X-ray sources is 10^{33-35} erg/s.
