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arXiv 2005.01028astro-ph.HE
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INTEGRAL AGN的X射线吸收:主星系倾角

X-ray absorption in INTEGRAL AGN: Host galaxy inclination

A. Malizia, L. Bassani, J. B. Stephen, A. Bazzano, P. Ubertini

摘要:

本文利用活动星系核的INTEGRAL硬X射线选择样品,研究了在X射线波段测量的NH总量中,主星系内分布的吸收物质的可能贡献。我们收集了所有可用的轴比测量的星系托管我们的活动星系核连同它们的形态信息,并发现,也为我们的硬X射线选择的样本的赤字的边缘上的星系托管1型活动星系核是存在的。我们估计,在我们的硬X射线选择的样品有24%(+/- 5%)的赤字1型活动星系核。红移中可能的偏差已经被排除,因为我们在一个确定的z范围内发现了相同的效果,其中两个类的数量和分布在统计上是相同的。我们的研究结果清楚地表明,位于宿主星系的数百秒差距尺度上的物质,而不是与AGN的假定吸收环面对齐,可以有助于柱密度的总量。这个星系吸收体可以大到足以掩盖一些1型活动星系核的宽线区域,导致它们被归类为2型物体,并导致边缘星系中的1型物体不足。

英文摘要:

In this work the INTEGRAL hard X-ray selected sample of AGN has been used to investigate the possible contribution of absorbing material distributed within the host galaxies to the total amount of NH measured in the X-ray band. We collected all the available axial ratio measurements of the galaxies hosting our AGN together with their morphological information and find that also for our hard X-ray selected sample a deficit of edge-on galaxies hosting type 1 AGN is present. We estimate that in our hard X-ray selected sample there is a deficit of 24% (+/- 5%) of type 1 AGN. Possible bias in redshift has been excluded, as we found the same effect in a well determined range of z where the number and the distributions of the two classes are statistically the same. Our findings clearly indicate that material located in the host galaxy on scales of hundreds of parsecs and not aligned with the putative absorbing torus of the AGN can contribute to the total amount of column density. This galactic absorber can be large enough to hide the broad line region of some type 1 AGN causing their classification as type 2 objects and giving rise to the deficiency of type 1 in edge-on galaxies.

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