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arXiv 0910.0367astro-ph.HE
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1H 0707 -495中的宽铁L线和X射线反射

Broad iron L-line and X-ray reverberation in 1H0707-495

A. Zoghbi, A. Fabian, P. Uttley, G. Miniutti, L. Gallo, C. Reynolds, J. Miller, G. Ponti

摘要:

本文详细分析了窄线塞弗特1星系1H 0707 -495的XMM-Newton长观测资料,包括光谱拟合、光谱变率和计时研究。光谱中的两个主要特征是在~ 7 keV处的下降和低于1 keV的复合过量。这可以用两条宽的铁线K和L来很好地描述。基于吸收的替代模型,虽然它们可能适合高能量下降,但不能解释1 keV的复杂性和整个光谱。光谱变异性表明,光谱是由至少两个组件,这被解释为一个幂律占主导地位的1-4千电子伏之间,和反射组件以外的这个范围。在铁L能量下的高计数率使我们能够在0.3-1和1-4 keV之间测量到约30 s的显著软滞后,这意味着直接硬发射导致反射发射。我们解释滞后作为一个混响信号起源于几个引力半径的黑洞。

英文摘要:

A detailed analysis of a long XMM-Newton observation of the Narrow Line Seyfert 1 galaxy 1H0707-495 is presented, including spectral fitting, spectral variability and timing studies. The two main features in the spectrum are the drop at ~ 7 keV and a complex excess below 1 keV. These are well described by two broad, K and L, iron lines. Alternative models based on absorption, although they may fit the high energy drop, cannot account for the 1 keV complexity and the spectrum as a whole. Spectral variability shows that the spectrum is composed of at least two components, which are interpreted as a power-law dominating between 1-4 keV, and a reflection component outside this range. The high count rate at the iron L energies has enabled us to measure a significant soft lag of ~ 30 s between 0.3-1 and 1-4 keV, meaning that the direct hard emission leads the reflected emissions. We interpret the lag as a reverberation signal originating within a few gravitational radii of the black hole.

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