arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2602.08408astro-ph.HE
收藏

利用XMM-牛顿卫星对Cen X-3进行高分辨率X射线光谱分析

High-resolution X-ray spectroscopy of Cen X-3 with XMM-Newton

University of Alicante(阿利坎特大学);University Institute of Physics Applied to Sciences and Technologies, University of Alicante(阿利坎特大学物理科学与技术应用研究所)

J. J. Rodes-Roca, J. M. Torrejón, G. Sanjurjo-Ferrín, J. Planelles Villalva

AI总结:

本文利用XMM-牛顿卫星对Cen X-3双星系统进行高分辨率X射线光谱分析,通过比较凌日和非凌日光谱,研究致密天体周围环境的性质,并发现中性气体和电离物质对X射线连续谱的强烈吸收。

摘要:

本文报告了XMM-牛顿卫星对高质量X射线双星系统Cen X-3的两次观测的光谱分析。特别关注凌日和非凌日光谱,以比较致密天体周围环境的性质。通过XMM-牛顿卫星上的反射光栅光谱仪获得的高分辨率光谱,分别分析了凌日和非凌日光谱。在SPEX中探索了多种连续模型,研究了光谱中识别出的发射和吸收线所对应的发射和吸收物质的性质。发现X射线连续谱被中性气体和电离物质强烈吸收。在凌日光谱中检测到Si v、Mg xii、Mg xi和Ne x的发射线。特别是Mg和Ne的H-like线在凌日光谱中显著性大于5 sigma,在非凌日光谱中为3 sigma。但非凌日光谱中任何吸收线(如果有的话)的显著性均小于2 sigma。RGS光变曲线显示非凌日光谱中出现的下降可能不是由于柱吸收增加,而是由吸积流的不稳定性引起。另一方面,20以上计数水平与X射线背景一致。使用简单的局部连续模型描述了Ne的He-like三重态,并推导出的R和G比参数表明紫外光球场在产生线的地点应起重要作用,且电子密度大于10(12) cm-3。因此,二元系统中可能存在混合等离子体。

英文摘要:

The spectral analysis of two XMM-Newton observations of the high-mass X-ray binary system Cen X-3 is presented. In particular, it is focused on the eclipse and out-of-eclipse spectra in order to compare the properties of the environment around the compact object. The high-resolution spectra obtained from the reflection grating spectrometer on board XMM-Newton was analysed focusing on studying eclipse and out-of-eclipse spectra separately. Several continuum models were explored in SPEX for which we studied the properties of emitting and absorbing matter depending on the emission and absorption lines identified in the spectra. It was found that the X-ray continuum is heavily absorbed by a neutral gas and photoionised matter. Emission lines from Si v, Mg xii, Mg xi, and Ne x were detected in the eclipse spectrum. In particular, H-like lines of Mg and Ne with a significance greater than 5 sigma in the eclipse spectrum and 3 sigma in the out-of-eclipse spectrum. But in the out-of-eclipse spectrum any absorption lines, if any, were detected with a significance less than 2 sigma. RGS light curve showed dips in the out-of-eclipse spectrum which are not due to an increase in the column absorption but may be produced by instabilities in the accretion stream. On the other hand, the level of counts above 20 was compatible with the X-ray background. A simple local continuum model was used to describe the He-like triplet of Ne and the derived values of R and G ratio parameters pointed out that the UV photospheric field should be important at the line production site and an electron density greater than 10(12) cm-3. As a consequence, a hybrid plasma may be present in the binary system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑