arXiv 0809.21572008-09-12astro-ph

X射线中的Q2237 +0305：XMM-牛顿光谱和变异性

Q2237+0305 in X-rays: spectra and variability with XMM-Newton

E. V. Fedorova, V. I. Zhdanov, C. Vignali, G. G. C. Palumbo

备注：: 6 pages, 7 figures, 4 tables, accepted by A&A
DOI：: 10.1051/0004-6361:20078730

摘要：

对引力透镜类星体的X射线观测可以让我们探测类星体中心引擎的内部结构。对Q2237+0305（爱因斯坦十字）的X射线观测可以用来约束X射线发射源的内部结构。本文分析了2002年在引力透镜系统Q2237+0305中对类星体的XMM-牛顿观测。提取了该系统中类星体的四幅图像的组合光谱，并用幂律模型进行了模拟。统计分析用于测试总通量的可变性。在0.2-10 keV的范围内，来自这个四重引力透镜系统的所有图像的总X射线通量为6 x 10^{-13} erg/cm 2/s，在几乎42 ks的观测时间内没有显示出显著的X射线光谱变化。对净化后的源光谱进行拟合，得到光子幂律指数Gamma=1.82+0.07/-0.08。扣除背景后得到的X射线光变曲线与来自源的稳定通量的假设是相容的。

英文摘要：

X-ray observations of gravitationally lensed quasars may allow us to probe the inner structure of the central engine of a quasar. Observations of Q2237+0305 (Einstein Cross) in X-rays may be used to constrain the inner structure of the X-ray emitting source. Here we analyze the XMM-Newton observation of the quasar in the gravitational lens system Q2237+0305 taken during 2002. Combined spectra of the four images of the quasar in this system were extracted and modelled with a power-law model. Statistical analysis was used to test the variability of the total flux. The total X-ray flux from all the images of this quadruple gravitational lens system is 6 x 10^{-13} erg/cm2/s in the range 0.2-10 keV, showing no significant X-ray spectral variability during almost 42 ks of the observation time. Fitting of the cleaned source spectrum yields a photon power-law index of Gamma=1.82+0.07/-0.08. The X-ray lightcurves obtained after background subtraction are compatible with the hypothesis of a stationary flux from the source.

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