标题： 活动星系核宿主星系的光学HST和红外倾斜图像的二维建模 显示英文标题

标题： Two-Dimensional Modelling of Optical HST and Infrared Tip-Tilt Images of Quasar Host Galaxies

摘要： 给出了从 McLure 等人（1999）和 Dunlop 等人（2000）展示的哈勃空间望远镜（HST）类星体图像中提取宿主星系参数所使用方法的描述。随后，我们给出了对该技术在一系列模拟类星体+宿主组合上的广泛测试结果，这些模拟覆盖了我们的 HST 研究的红移范围（0.1 < z < 0.3）。这些模拟表明，当应用于我们的深度 HST 图像时，我们的分析方法能够轻松区分特定宿主星系的形态类型，并且可以确定其尺度长度、光度、轴比和位置角，误差在几个百分点以内。我们还展示了我们{\sc hst}样本中最亮的四个类星体的新红外尖点倾斜图像，以及以类似方式对这些数据建模的结果。这些结果进一步增强了对推导出的宿主星系尺度长度的准确性信心，并允许准确确定此源子集的$R-K$颜色。这四个类星体宿主星系都具有非常相似的红色颜色，$R-K = 2.9 \pm 0.2$，表明其恒星群体已经高度演化。 显示英文摘要

摘要： A description is given of the method used to extract quasar host-galaxy parameters from the deep Hubble Space Telescope quasar images presented by McLure et al. (1999) and Dunlop et al. (2000). We then give the results of extensive testing of this technique on a wide range of simulated quasar+host combinations spanning the redshift range of our HST study (0.1 < z < 0.3). These simulations demonstrate that, when applied to our deep HST images, our method of analysis can easily distinguish the morphological type of a given host galaxy, as well as determining its scalelength, luminosity, axial ratio and position angle to within an accuracy of a few percent. We also present new infrared tip-tilt images of 4 of the most luminous quasars in our {\sc hst} sample, along with the outcome of modelling these data in a similar manner. The results provide further confidence in the accuracy of the derived host-galaxy scalelengths, and allow accurate determination of $R-K$ colours for this subset of sources. All 4 of these quasar host galaxies have very similar red colours, $R-K = 2.9 \pm 0.2$, indicative of a well-evolved stellar population.