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arXiv 0812.0506astro-ph
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Mrk 279的可变本征吸收

Variable Intrinsic Absorption in Mrk 279

Jennifer E. Scott, Nahum Arav, Jack R. Gabel, Gerard A. Kriss, Jessica Kim Quijano, Jelle S. Kaastra, Elisa Costantini, Kirk Korista

摘要:

我们研究的变化,在塞弗特1星系Mrk 279使用三个时代的观测远紫外光谱探测器(FUSE)和两个时代的观测与哈勃太空望远镜的空间望远镜成像光谱仪。而不是找到简单的光电离响应的吸收气体的变化,在底层的连续,所观察到的变化的吸收曲线可以更清楚地理解,如果有效覆盖分数的气体在所有的发射组件,连续和广泛的和中等速度宽度的发射线,占。虽然我们不唯一解决所有这些单独的覆盖分数和离子柱密度使用光谱数据,我们检查参数空间使用以前良好的约束解决方案的连续和单一的发射组件覆盖分数。假设完全覆盖的连续,我们发现,Mrk 279吸收的两个速度分量最有可能与其流出,一个可能有零覆盖的中间线区域,而其他没有。然而,对于每个分量,宽线区域比中间线区域被更完全地覆盖。在O VI列密度的变化是不受约束的,由于饱和,但我们表明,在不饱和的C IV和N V列密度的小变化是一致的流出气体具有零或部分覆盖的中间线区域和电离参数从~0.01到~0.1从2002年至2003年的UV连续通量增加了一个因素~8。在C III吸收柱密度的变化的情况下,是由于该物种产生的Mrk 279流出外。

英文摘要:

We examine the variability in the intrinsic absorption in the Seyfert 1 galaxy Mrk 279 using three epochs of observations from the Far Ultraviolet Spectroscopic Explorer (FUSE) and two epochs of observations with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. Rather than finding simple photoionization responses of the absorbing gas to changes in the underlying continuum, the observed changes in the absorption profiles can be understood more clearly if the effective covering fraction of the gas in all emission components, continuum and broad and intermediate velocity width emission lines, is accounted for. While we do not uniquely solve for all of these separate covering fractions and the ionic column densities using the spectral data, we examine the parameter space using previously well-constrained solutions for continuum and single emission component covering fractions. Assuming full coverage of the continuum, we find that of the two velocity components of the Mrk 279 absorption most likely associated with its outflow, one likely has zero coverage of the intermediate line region while the other does not. For each component, however, the broad line region is more fully covered than the intermediate line region. Changes in the O VI column densities are unconstrained due to saturation, but we show that small changes in the nonsaturated C IV and N V column densities are consistent with the outflow gas having zero or partial covering of the intermediate line region and an ionization parameter changing from ~0.01 to ~0.1 from 2002 to 2003 as the UV continuum flux increased by a factor of ~8. The absence of a change in the C III absorbing column density is attributed to this species arising outside the Mrk 279 outflow.

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