arXiv 0804.13632008-04astro-ph

活动星系核宿主星系形态分解的精度

The Accuracy of Morphological Decomposition of Active Galactic Nucleus Host Galaxies

B. D. Simmons, C. M. Urry

备注：: 45 pages, 20 figures, submitted to ApJ ; Accepted Version -- additions to introduction and conclusions; title changed, was "Simulations of AGN Host Galaxy Morphologies"
DOI：: 10.1086/589827

摘要：

为了评估我们确定活动星系核宿主星系形态的准确性，我们模拟了超过50，000个z < 1.25的星系的ACS图像，使用适合于GOODS调查的图像和噪声特性。我们用一组在正常星系中心添加点源的模拟活动星系核宿主星系来检验中心点源亮度对宿主星系参数恢复的影响。我们扩展了这种分析，也量化的活动星系核宿主星系与一组完全模拟的不活跃和活动星系核宿主星系的内在形态参数的恢复。在L_{host}：L_{PS} > 1：4的情况下，我们可以使用合理的误差切割组合来可靠地将好的拟合结果与差的拟合结果分开。我们给出了定量估计的参数误差作为主机到点源比的函数。在一般情况下，我们分离主机和点源的幅度可靠地在所有的红移;点源恢复良好的时间超过90%，虽然虚假检测中心点源可以高达25%的膨胀为主的来源。我们发现Sersic指数和内禀膨胀率与总膨胀率之间存在普遍的相关性，因此Sersic n < 1.5的宿主星系通常至少有80%的光来自盘组件。同样地，n > 4的“膨胀主导”星系通常至少有70%的宿主星系光来自膨胀，但这个数字可能低至55%。对活动星系核宿主星系的单分量Sersic拟合在统计上非常可靠，z < 1.25（对于像我们这样的ACS调查数据）。相比之下，涉及单独的凸起和盘组件的双组件拟合倾向于高估凸起分数约10%，不确定性约为50%。

英文摘要：

In order to assess the accuracy with which we can determine the morphologies of AGN host galaxies, we have simulated more than 50,000 ACS images of galaxies with z < 1.25, using image and noise properties appropriate for the GOODS survey. We test the effect of central point-source brightness on host galaxy parameter recovery with a set of simulated AGN host galaxies made by adding point sources to the centers of normal galaxies. We extend this analysis and also quantify the recovery of intrinsic morphological parameters of AGN host galaxies with a set of fully simulated inactive and AGN host galaxies. We can reliably separate good from poor fit results using a combination of reasonable error cuts, in the regime where L_{host}:L_{PS} > 1:4. We give quantitative estimates of parameter errors as a function of host-to-point-source ratio. In general, we separate host and point-source magnitudes reliably at all redshifts; point sources are well recovered more than 90% of the time, although spurious detection of central point sources can be as high as 25% for bulge-dominated sources. We find a general correlation between Sersic index and intrinsic bulge-to-total ratio, such that a host galaxy with Sersic n < 1.5 generally has at least 80% of its light from a disk component. Likewise, "bulge-dominated" galaxies with n > 4 typically derive at least 70% of their total host galaxy light from a bulge, but this number can be as low as 55%. Single-component Sersic fits to an AGN host galaxy are statistically very reliable to z < 1.25 (for ACS survey data like ours). In contrast, two-component fits involving separate bulge and disk components tend to over-estimate the bulge fraction by ~10%, with uncertainty of order 50%.

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英文摘要：

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