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A MASSIVE X-RAY OUTFLOW FROM THE QUASAR PDS 456

机译:QUASAR PDS 456的大量X射线流出

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We report on XMM-Newton spectroscopic observations of the luminous radio-quiet quasar PDS 456, The hard X-ray spectrum of PDS 456 shows a deep absorption trough (constituting 50% of the continuum) at energies above 7 keV in the quasar rest frame, which can be attributed to a series of blueshifted K-shell absorption edges due to highly ionized iron. The higher resolution soft X-ray Reflection Grating Spectrometer spectrum exhibits a broad absorption line feature near 1 keV, which can be modeled by a blend of L-shell transitions from highly ionized iron (Fe XVII―Fe XXIV). An extreme outflow velocity of ~50,000 km s~(-1) is required to model the K- and L-shell iron absorption present in the XMM-Newton data. Overall, a large column density (N_H = 5 x 10~(23) cm~(-2)) of highly ionized gas (log ξ= 2.5) is required in PDS 456. A high-mass outflow rate of ~10 solar mass yr~(-1) (assuming a conservative outflow covering factor of 0.1 sr) is derived, which is of the same order as the overall mass accretion rate in PDS 456. The kinetic energy of the outflow represents a substantial fraction (~10%) of the quasar energy budget, while the large column and outflow velocity place PDS 456 toward the extreme end of the broad absorption line quasar population.
机译:我们报告了发光的静态类星体PDS 456的XMM-牛顿光谱观察结果,PDS 456的硬X射线光谱在类星体静止框架中的能量高于7 keV时显示了一个深吸收槽(构成连续谱的50%)。 ,这可以归因于由于高度离子化的铁引起的一系列蓝移的K壳吸收边缘。较高分辨率的软X射线反射光栅光谱仪光谱在1 keV附近具有宽吸收线特征,可以通过高离子化铁(Fe XVII-Fe XXIV)的L壳转变混合来建模。要模拟XMM-Newton数据中存在的K和L壳铁吸收,需要大约50,000 km s〜(-1)的极高流出速度。总体而言,PDS 456需要使用大柱密度(N_H = 5 x 10〜(23)cm〜(-2))的高电离气体(logξ= 2.5)。高质量的流出量约为10太阳质量得出yr〜(-1)(假设保守的流出覆盖因子为0.1 sr),与PDS 456中的总质量增加率处于相同的数量级。流出的动能占很大一部分(〜10% ),而较大的色谱柱和流出速度使PDS 456朝向宽吸收线类星体种群的最末端。

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