arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新，休息一下吧，周末愉快~~
arXiv 0704.2192astro-ph
收藏

康普顿化与吸积功率X射线脉冲星的光谱

Comptonization and the Spectra of Accretion-Powered X-Ray Pulsars

Michael T. Wolff, Peter A. Becker, Kenneth D. Wolfram

备注：
6 Pages, 2 Figures, To appear in "The Multicoloured Landscape of Compact Objects and their Explosive Progenitors" (Cefalu, Sicily, June 2006). Eds. L. Burderi et al. (New York: AIP)
发表信息：
AIPConf.Proc.924:496-501,2007
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

吸积动力X射线源是银河系中最明亮的X射线源之一。然而，尽管自发现以来进行了数十年的理论和观测工作，但还没有出现令人满意的X射线光谱形成模型。在本文中，我们报告了一个自洽计算的频谱出现从脉冲星吸积柱，其中包括一个明确的治疗的散装和热康普顿化发生在辐射为主的冲击，形成在吸积流。使用严格的本征函数展开方法，我们得到了封闭形式的格林函数描述的单色辐射注入到列的上散射的表达式。格林函数与韧致辐射、回旋加速器和黑体源项卷积，计算出射光子谱。我们表明，在冲击波中的光子的闪烁自然产生一个X射线光谱与一个相对平坦的连续和高能量的指数截止。最后，我们证明了我们的模型与明亮的脉冲星Her X-1和低光度脉冲星X Per的光谱有很好的一致性。

英文摘要：

Accretion-powered X-ray pulsars are among the most luminous X-ray sources in the Galaxy. However, despite decades of theoretical and observational work since their discovery, no satisfactory model for the formation of the observed X-ray spectra has emerged. In this paper, we report on a self-consistent calculation of the spectrum emerging from a pulsar accretion column that includes an explicit treatment of the bulk and thermal Comptonization occurring in the radiation-dominated shocks that form in the accretion flows. Using a rigorous eigenfunction expansion method, we obtain a closed-form expression for the Green's function describing the upscattering of monochromatic radiation injected into the column. The Green's function is convolved with bremsstrahlung, cyclotron, and blackbody source terms to calculate the emergent photon spectrum. We show that energization of photons in the shock naturally produces an X-ray spectrum with a relatively flat continuum and a high-energy exponential cutoff. Finally, we demonstrate that our model yields good agreement with the spectra of the bright pulsar Her X-1 and the low luminosity pulsar X Per.

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。

↑