标题： 类星体宿主星系光学HST和红外尖端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： 我们详细描述了我们用来从McLure等人(1999)和Dunlop等人(2000)提供的深场哈勃空间望远镜(HST)类星体图像中提取类星体宿主星系参数的方法。然后，我们给出了在广泛范围的模拟类星体+宿主组合上对该技术进行的大量测试结果，这些组合涵盖了我们HST研究的红移范围(0.1 < z < 0.3)。这些模拟表明，当应用于我们的深场HST图像时，我们的分析方法可以轻松区分给定宿主星系的形态类型，并且能够以几百分比的精度确定其尺度长度、光度、轴比和位置角。我们还提供了我们HST样本中4个最明亮类星体的新红外尖端倾斜图像，以及以类似方式对这些数据进行建模的结果。结果进一步增强了对所推导的宿主星系尺度长度准确性的信心，并允许对这一部分源进行准确的R-K颜色测定。这4个类星体宿主星系都有非常相似的红色调，R-K = 2.9\pm 0.2，表明存在一个充分演化的恒星种群。 显示英文摘要

摘要： We provide a detailed description of the method we have used to extract quasar host-galaxy parameters from the deep Hubble Space Telescope (HST) 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 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.