论文标题
表征无线电狭窄线seyfert 1 Galaxy Iras 17020+4544中的连续变异性
Characterising continuum variability in the radio-loud narrow-line Seyfert 1 galaxy IRAS 17020+4544
论文作者
论文摘要
我们介绍了IRAS 17020+4544的四个XMM-Newton EPIC PN观测值的时间和光谱分析的结果,这是一个狭窄的Seyfert 1 Galaxy,带有无线电喷射的证据。对光曲线的分析表明,这种无线电源的行为不像其放射性广播的大量人群。发现频谱硬化随通量增加的趋势。发现变异性随着能量而增加,尽管随着光谱的变化而减小。最新观察的前40 k在时代中的表现出色,比其他任何时候都表现出柔和的光谱状态。发现低能处可能的非平稳性,在较高能量下没有这种影响,表明至少两个不同的光谱成分。在软状态时期,通过滞后,滞后能源和协方差光谱发生了明显变化,证实了混响的标志。时间分析表明,在存在反射成分的情况下,可变的幂律,从而激发了所有时期的0.3-10 KeV epic PN光谱的适合。我们发现使用定时动机参数可接受的光谱拟合,并报告检测宽Fe K发射线,需要超出反射谱的附加模型组件。我们讨论了该来源与其他狭窄的Seyfert 1来源之间的联系,这些链接显示了JET活动的证据,发现当前非常有限的有趣对象样本中的相似性。
We present results of temporal and spectral analyses on four XMM-Newton EPIC pn observations of IRAS 17020+4544, a narrow-line Seyfert 1 galaxy with evidence of a radio jet. Analysis of the light curves reveals that this radio-loud source does not behave like the bulk population of its radio-quiet counterparts. A trend of spectral hardening with increased flux is found. Variability is found to increase with energy, though it decreases as the spectrum hardens. The first 40 ks of the most recent observation behave uniquely among the epochs, exhibiting a softer spectral state than at any other time. Possible non-stationarity at low energies is found, with no such effect present at higher energies, suggesting at least two distinct spectral components. A reverberation signature is confirmed, with the lag-frequency, lag-energy, and covariance spectra changing significantly during the soft-state epoch. The temporal analysis suggests a variable power-law in the presence of a reflection component, thus motivating such a fit for the 0.3-10 keV EPIC pn spectra from all epochs. We find an acceptable spectral fit using the timing-motivated parameters and report the detection of a broad Fe K emission line, requiring an additional model component beyond the reflection spectrum. We discuss links between this source and other narrow-line Seyfert 1 sources that show evidence of jet activity, finding similarities among this currently very limited sample of interesting objects.