论文标题
积分AGN中的X射线吸收：宿主星系倾斜度
X-ray absorption in INTEGRAL AGN: Host galaxy inclination
论文作者
论文摘要
在这项工作中，积分的硬X射线选定的AGN样品已用于研究宿主星系中分布的吸收材料对X射线带中测量的NH总量的可能贡献。我们收集了托管AGN以及它们的形态信息的星系的所有可用轴向比率测量值，并发现对于我们的硬X射线选择样品，也存在托管1型AGN的边缘的星系不足。我们估计，在我们的硬X射线选定样品中，1型AGN的赤字为24％（+/- 5％）。红移中可能的偏差已被排除在外，因为我们在z的确定范围内发现了相同的效果，在z的数字和分布上，这两个类别在统计上是相同的。我们的发现清楚地表明，位于宿主星系中的材料在数百个parsecs的尺度上，而与AGN的假定吸收圆环不符可能有助于总柱密度的总量。该银河吸收器可能足够大，可以隐藏某种类型1 AGN的宽线区域，从而使其分类为2型对象，并导致边缘星系中1型的缺陷。
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.
