“观察和分析”来自模拟高红移宇宙的图像
"Observing and Analyzing" Images From a Simulated High Redshift Universe
摘要：
我们通过流体动力学宇宙学模拟研究了星系的restframe UV光度函数（LF）的高红移演化，再加上一个模拟的观测天文学管道，提供了与观测的直接比较。我们这样做，通过创建模拟图像和人工星系目录约100平方角分领域的数值模型在红移~ 4.5至10.4。我们包括尘埃消光和点扩散函数（PSF）的哈勃WFC 3相机与空间观测比较的影响。我们还包括预期的黄道背景，以预测其对空间观测的影响，包括未来的任务，如詹姆斯韦伯太空望远镜（JWST）。当我们的模型目录被拟合到Schechter函数参数时，我们预测LF的暗端斜率α在红移范围z ~ 4.5到7.7内演化为α = -1.16-0.12 z，与来自例如，Hathi等人（2010年）。然而，对于红移z ~ 6到10.4，alpha（z）似乎显示出较浅的演化，alpha = -1.79-0.03 z。用更详细的物理学--特别是恒星风和超新星（SN）--来增强模拟也会产生类似的结果。该模型显示，与观测结果相比，星系的生产过剩，特别是在微弱的星等下，尽管当考虑到尘埃消光时，这种差异有所减少。
英文摘要：
We investigate the high-redshift evolution of the restframe UV-luminosity function (LF) of galaxies via hydrodynamical cosmological simulations, coupled with an emulated observational astronomy pipeline that provides a direct comparison with observations. We do this by creating mock images and synthetic galaxy catalogs of approximately 100 square arcminute fields from the numerical model at redshifts ~ 4.5 to 10.4. We include the effects of dust extinction and the point spread function (PSF) for the Hubble WFC3 camera for comparison with space observations. We also include the expected zodiacal background to predict its effect on space observations, including future missions such as the James Webb Space Telescope (JWST). When our model catalogs are fitted to Schechter function parameters, we predict that the faint-end slope alpha of the LF evolves as alpha = -1.16 - 0.12 z over the redshift range z ~ 4.5 to 7.7, in excellent agreement with observations from e.g., Hathi et al. (2010). However, for redshifts z ~ 6 to 10.4, alpha(z) appears to display a shallower evolution, alpha = -1.79 - 0.03 z. Augmenting the simulations with more detailed physics - specifically stellar winds and supernovae (SN) - produces similar results. The model shows an overproduction of galaxies, especially at faint magnitudes, compared with the observations, although the discrepancy is reduced when dust extinction is taken into account.
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