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arXiv 1101.1114astro-ph.HEastro-ph.GAphysics.atom-ph
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星际介质中氧K吸收的模拟:Sco的{ \it XMM }-牛顿观点X-1

Modeling the oxygen K absorption in the interstellar medium: an {\it XMM}-Newton view of Sco X-1

J. García, J. M. Ramírez, T. R. Kallman, M. Witthoeft, M. A. Bautista, C. Mendoza, P. Palmeri, P. Quinet

摘要:

通过分析低质量X射线双星Sco X-1的{ \it XMM}-Newton观测,研究了氧在星际介质中的吸收结构。我们使用简单的模型的基础上O { \sc i}原子截面从不同的来源,以适应数据和评估的原子数据在解释天体物理观测的影响。我们表明,在原子计算中相对较小的差异可以产生虚假的结果。我们还表明,最完整和准确的一套原子截面成功地再现了观测数据中的$21-24.5$波长区域的光谱。我们的拟合表明,吸收主要是由于中性气体的电离参数$ξ=10^{-4}$ erg cm s $^{-1}$,和氧柱密度$N_{\mathrm{O}}\approx 8-10\times 10^{17}$ cm $^{-2}$。我们的模型能够再现K边缘和K $α$吸收线从O { \sc i},这是在这个区域中的两个主要功能。我们没有发现除原子氧以外的其他物质吸收的确凿证据。

英文摘要:

We investigate the absorption structure of the oxygen in the interstellar medium by analyzing {\it XMM}-Newton observations of the low mass X-ray binary Sco X-1. We use simple models based on the O {\sc i} atomic cross section from different sources to fit the data and evaluate the impact of the atomic data in the interpretation of astrophysical observations. We show that relatively small differences in the atomic calculations can yield spurious results. We also show that the most complete and accurate set of atomic cross sections successfully reproduce the observed data in the $21-24.5$ Å wavelength region of the spectrum. Our fits indicate that the absorption is mainly due to neutral gas with an ionization parameter of $ξ=10^{-4}$ erg cm s$^{-1}$, and an oxygen column density of $N_{\mathrm{O}}\approx 8-10\times 10^{17}$ cm$^{-2}$. Our models are able to reproduce both the K edge and the K$α$ absorption line from O {\sc i}, which are the two main features in this region. We find no conclusive evidence for absorption by other than atomic oxygen.

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。

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