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arXiv 0705.3242astro-ph
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用RXTE监测Seyfert 1.9星系NGC 2992内吸积盘的剧烈活动

Monitoring the Violent Activity from the Inner Accretion Disk of the Seyfert 1.9 Galaxy NGC 2992 with RXTE

Kendrah D. Murphy, Tahir Yaqoob, Yuichi Terashima

摘要:

本文介绍了用RXTE对Seyfert 1.9星系NGC 2992进行为期一年的观测的结果。从历史上看,源已被证明在2-10千电子伏的流量在几年的时间尺度上显着变化,并被认为是缓慢过渡的时期之间的静止和活跃的吸积。我们的研究结果表明,在一年的源连续通量几乎覆盖了整个历史范围,使得低光度状态不太可能对应于吸积机制关闭。在耀斑发作期间,我们发现一个高度红移的Fe K线出现,这意味着剧烈的活动发生在内部的吸积盘,在~100的中心黑洞的引力半径。我们还发现,X射线连续谱的光谱指数在大振幅变化期间保持近似恒定。这些观测结果使NGC 2992非常适合于未来的多波段监测,作为约束吸积模型的测试平台。

英文摘要:

We present the results of a one year monitoring campaign of the Seyfert 1.9 galaxy NGC 2992 with RXTE. Historically, the source has been shown to vary dramatically in 2-10 keV flux over timescales of years and was thought to be slowly transitioning between periods of quiescence and active accretion. Our results show that in one year the source continuum flux covered almost the entire historical range, making it unlikely that the low-luminosity states correspond to the accretion mechanism switching off. During flaring episodes we found that a highly redshifted Fe K line appears, implying that the violent activity is occurring in the inner accretion disk, within ~100 gravitational radii of the central black hole. We also found that the spectral index of the X-ray continuum remained approximately constant during the large amplitude variability. These observations make NGC 2992 well-suited for future multi-waveband monitoring, as a test-bed for constraining accretion models.

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