A complete view of the broad‐line radio galaxy 4C +74.26 with XMM–Newton
A complete view of the broad‐line radio galaxy 4C +74.26 with XMM–Newton
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使用 XMM-Newton 观察宽线射电星系 4C +74.26 的完整视图
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发表时间：
2005
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通讯作者：
D. Ballantyne
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作者：
D. Ballantyne
本文利用35-ks XMM-牛顿观测数据对宽线射电星系4C +74.26进行了时间研究和宽带光谱分析。正如在以前的数据集中发现的那样，该源没有表现出快速变化的证据，其0.2-10 keV的光变曲线很好地拟合了一个常数。一个很好的适合pn 0.3-12千电子伏的光谱被发现使用一个连续的电离和中性反射相结合，增强了冷和暖吸收。没有证据表明存在软过剩。冷吸收柱大于银河值，内禀柱为1.9 × 1021 cm-2。从O VII和O VIII吸收边发现了暖吸收体的证据，其最大光学深度分别为τ max O VII = 0.3和τ max O VIII = 0.03。联合pn-MOS拟合将O VIII光学深度增加到τ max O VIII = 0.1。一个简单的，一个区域的温暖的吸收模型产生了一个柱的10.9 × 1020 cm-2和电离参数为10.60。部分覆盖模型提供了显着更差的拟合比那些包括相对论加宽的Fe Ka线，加强了这样的线的存在的情况下。总的来说，4C +74.26的X射线光谱表现出许多典型的射电大声类星体（过度吸收）和射电安静的塞弗特1星系（Fe Ka发射和温暖吸收）的特征。我们还表明，一个虚假的吸收线在108 keV可以创建由仪器铜Ka发射线的减法。
This paper presents a timing study and broad-band spectral analysis of the broad-line radio galaxy 4C +74.26 based on a 35-ks XMM-Newton observation. As found in previous data sets, the source exhibits no evidence for rapid variability, and its 0.2-10 keV light curve is well fitted by a constant. An excellent fit to the pn 0.3-12 keV spectrum was found using a continuum that combines an ionized and a neutral reflector, augmented by both cold and warm absorption. There is no evidence for a soft excess. The column of cold absorption was greater than the Galactic value, with an intrinsic column of ∼ 1.9 x 10 21 cm -2 . Evidence for the warm absorber was found from O VII and O VIII absorption edges with maximum optical depths of τ max O VII = 0.3 and τ max O VIII = 0.03, respectively. A joint pn-MOS fit increased the O VIII optical depth to τ max O VIII = 0.1. A simple, one-zone warm absorber model yielded a column of ∼9 x 10 20 cm -2 and an ionization parameter of ∼60. Partial covering models provide significantly worse fits than ones including a relativistically broadened Fe Ka line, strengthening the case for the existence of such a line. On the whole, the X-ray spectrum of 4C +74.26 exhibits many features typical of both a radio-loud quasar (excess absorption) and radio-quiet Seyfert 1 galaxies (Fe Ka emission and warm absorption). We also show that a spurious absorption line at ∼8 keV can be created by the subtraction of an instrumental Cu Ka emission line.