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arXiv 2106.06567astro-ph.GA
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PG 2112+059中的X射线风连接

The X-Rays wind connection in PG 2112+059

C. Saez, W. N. Brandt, F. Bauer, G. Chartas, T. Misawa, F. Hamann, S. Gallagher

摘要:

通过比较Chandra-ACIS数据和同期的紫外HST/STIS光谱,研究了高X射线变类星体PG 2112+059中宽吸收线风的X射线和紫外性质之间的联系.我们观察到的相关性,即增加的等效宽度(EW)的BALs是伴随着一个红色的紫外光谱。BALs EW的增长还伴随着软X射线发射(<2keV)的显著变暗,这与增加的吸收一致。硬X射线发射的变化(>2 keV)仅伴随着UV-BALs的微小光谱变化,并且在BALs的EW中没有显示出显著的变化。这些趋势表明了一个挡风玻璃的情况下,外流倾斜度相对于视线正在减少和/或风质量正在增加。这些变化提高了BALs的覆盖率和/或柱密度,并且可能伴随着屏蔽的柱密度的几乎同时的增加。

英文摘要:

We study the connection between the X-ray and UV properties of the broad absorption line (BAL) wind in the highly X-ray variable quasar PG 2112+059 by comparing Chandra-ACIS data with contemporaneous UV HST/STIS spectra in three different epochs. We observe a correlation whereby an increase in the equivalent-widths (EWs) of the BALs is accompanied by a redder UV spectrum. The growth in the BALs EWs is also accompanied by a significant dimming in soft X-ray emission (<2 keV), consistent with increased absorption. Variations in the hard X-ray emission (>2 keV) are only accompanied by minor spectral variations of the UV-BALs and do not show significant changes in the EW of BALs. These trends suggest a wind-shield scenario where the outflow inclination with respect to the line of sight is decreasing and/or the wind mass is increasing. These changes elevate the covering fraction and/or column densities of the BALs and are likely accompanied by a nearly contemporaneous increase in the column density of the shield.

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