标题： 使用蟹状星云校准和星云X射线发射模型 显示英文标题

标题： On Calibrations using the Crab Nebula and Models of the Nebular X-ray Emission

摘要： 受一篇关于蟹状星云可能用作校准X射线响应函数的标准烛光的论文（Kirsch等，2005）的启发，我们研究了内在偏离单一（吸收）幂律对这种校准的影响。我们将分析限制在三种更现代的X射线仪器上——ROSAT/PSPC、RXTE/PCA和XMM-Newton/EPIC-pn（爆发模式）。结果表明需要改进所研究的三种响应函数中的两种。我们还能够区分当前用于系统光谱的两种理论模型。 显示英文摘要

摘要： Motivated by a paper (Kirsch et al. 2005) on possible use of the Crab Nebula as a standard candle for calibrating X-ray response functions, we examine consequences of intrinsic departures from a single (absorbed) power law upon such calibrations. We limit our analyses to three more modern X-ray instruments-the ROSAT/PSPC, the RXTE/PCA, and the XMM-Newton/EPIC-pn (burst mode). The results indicate a need to refine two of the three response functions studied. We are also able to distinguish between two current theoretical models for the system spectrum.