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arXiv 1002.3420astro-ph.CO
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XMM-牛顿RGS观测到的Seyfert 1星系NGC 3516的暖吸收体和X射线变率

The warm absorber and X-ray variability of the Seyfert 1 galaxy NGC 3516 as seen by the XMM-Newton RGS

M. Mehdipour, G. Branduardi-Raymont, M. J. Page

摘要:

本文对XMM-牛顿天文台上的反射光栅光谱仪(RGS)和欧洲光子成像照相机(EPIC)拍摄的塞弗特1星系NGC 3516的软能和中能X射线谱进行了新的分析。我们研究了2006年10月提出的四项意见。我们调查所观察到的变化是否是由于吸收温暖的吸收剂和/或是固有的源发射。我们详细分析了EPIC-pn和RGS光谱的每一个观测分别。发现NGC 3516中的暖吸收体由三个电离阶段组成,其中两个阶段的流出速度超过1000 km/s。第三阶段(电离最少的阶段)要慢得多,为100 km/s。其中一个高电离阶段,与log xi为2.4,被发现具有约60%的部分覆盖分数。以前有人认为,云的通道,盘风的一部分,在前面的源(产生的覆盖率的变化)是一个显着的下降在光变曲线在一个观测的原因。从我们的EPIC-pn和RGS光谱的建模,我们发现,在覆盖分数的变化不能完全负责。我们表明,在源连续的内在变化起着更重要的作用,在解释所观察到的通量和光谱变化比原来认为的。

英文摘要:

We present a new analysis of the soft and medium energy X-ray spectrum of the Seyfert 1 galaxy NGC 3516 taken with the Reflection Grating Spectrometer (RGS) and European Photon Imaging Camera (EPIC) on board the XMM-Newton observatory. We examine four observations made in October 2006. We investigate whether the observed variability is due to absorption by the warm absorber and/or is intrinsic to the source emission. We analyse in detail the EPIC-pn and RGS spectra of each observation separately. The warm absorber in NGC 3516 is found to consist of three phases of ionisation, two of which have outflow velocities of more than 1000 km/s. The third phase (the least ionised one) is much slower at 100 km/s. One of the high ionisation phases, with log xi of 2.4, is found to have a partial covering fraction of about 60%. It has previously been suggested that the passage of a cloud, part of a disk wind, in front of the source (producing a change in the covering fraction) was the cause of a significant dip in the lightcurve during one of the observations. From our modelling of the EPIC-pn and RGS spectra, we find that variation in the covering fraction cannot be solely responsible for this. We show that intrinsic change in the source continuum plays a much more significant role in explaining the observed flux and spectral variability than originally thought.

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