Markarian 335的朱雀观测：分布式反射体的证据
Suzaku observations of Markarian 335: evidence for a distributed reflector
摘要：
本文报道了窄线塞弗特1星系Mrk 335的净曝光量为151 ks的朱雀观测。0.5-40 keV的光谱包含宽Fe线、低于约2 keV的强软过剩和在20-30 keV附近的康普顿峰。我们发现，由幂律和两个反射器组成的模型提供了对时间平均光谱的最佳拟合。在这个模型中，电离的、严重模糊的内反射层产生了大部分的软过剩，而几乎中性的外反射层（在~40 r_g外）产生了大部分的Fe线发射。观测的光谱变异性的特征在于在非常低的计数率下的光谱硬化。在我们的幂律+双反射器模型中，似乎这种硬化主要是由幂律的旋转引起的。整个观测的均方根光谱具有活动星系核中常见的弯曲形状，尽管当考虑光变曲线中不包含任何深倾角的间隔时，形状明显更平坦。我们还研究了以前的133 KS XMM-牛顿观测Mrk 335。我们发现，XMM-牛顿谱可以与朱雀数据类似的双反射器模型拟合，我们确认观测的均方根谱是平坦的。平坦的均方根光谱，以及来自朱雀PIN探测器的高能数据，不利于Mrk 335中软过量的吸收起源。
英文摘要：
We report on a 151 ks net exposure Suzaku observation of the Narrow Line Seyfert 1 galaxy Mrk 335. The 0.5-40 keV spectrum contains a broad Fe line, a strong soft excess below about 2 keV and a Compton hump around 20-30 keV. We find that a model consisting of a power law and two reflectors provides the best fit to the time-averaged spectrum. In this model, an ionized, heavily blurred, inner reflector produces most of the soft excess, while an almost neutral outer reflector (outside ~40 r_g) produces most of the Fe line emission. The spectral variability of the observation is characterised by spectral hardening at very low count rates. In terms of our power-law + two-reflector model it seems like this hardening is mainly caused by pivoting of the power law. The rms spectrum of the entire observation has the curved shape commonly observed in AGN, although the shape is significantly flatter when an interval which does not contain any deep dip in the lightcurve is considered. We also examine a previous 133 ks XMM-Newton observation of Mrk 335. We find that the XMM-Newton spectrum can be fitted with a similar two-reflector model as the Suzaku data and we confirm that the rms spectrum of the observation is flat. The flat rms spectra, as well as the high-energy data from the Suzaku PIN detector, disfavour an absorption origin for the soft excess in Mrk 335.
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