论文标题
光谱模板最适合使用JWST在z> 8处选择星系
Spectral Templates Optimal for Selecting Galaxies at z > 8 with JWST
论文作者
论文摘要
高红移星系的选择通常涉及光度计数据的光谱能分布（SED）拟合，对污染水平的期望以及样品完整性的测量 - 所有这些都通过与子样本的光谱红移测量进行比较进行了审查。现在，第一个JWST数据正在占据不同的几个深度和各个区域的几个外部阶层领域，这将是发现和分类星系到以前未知的距离的理想选择。由于最初将无法与Z> 8星系的第一个光度测量值进行比较，因此该时期内的光谱红移测量值将是最重要的。 Z> 8处的星系预计将比典型的模型SED模板具有更蓝的休息型紫外线（UV）颜色，这可能导致灾难性的光度红移失败。 We use a combination of BPASS and Cloudy models to create a supporting set of templates that match the predicted rest-UV colors of z > 8 the simulated galaxies in a mock catalog (Yung et al. 2022), which mimics expected field depths and areas of the Cosmic Evolution Early Release Science Survey (CEERS: m$_{5σ}$ ~ 28.6 over ~100 arcmin$^2$; Finkelstein et Al。我们使用Eazy通过包含我们的新模板集来强调红移恢复的改进，并建议使用JWST在8 <Z <10中选择星系的标准，为观察者提供了一个重要的测试案例，可以冒险进入这个新的天文学时代。
The selection of high-redshift galaxies often involves spectral energy distribution (SED) fitting to photometric data, an expectation for contamination levels, and measurement of sample completeness -- all vetted through comparison to spectroscopic redshift measurements of a sub-sample. The first JWST data is now being taken over several extragalactic fields, to different depths and across various areas, which will be ideal for the discovery and classification of galaxies out to distances previously uncharted. As spectroscopic redshift measurements for sources in this epoch will not be initially available to compare with the first photometric measurements of z > 8 galaxies, robust photometric redshifts are of the utmost importance. Galaxies at z > 8 are expected to have bluer rest-frame ultraviolet (UV) colors than typically-used model SED templates, which could lead to catastrophic photometric redshift failures. We use a combination of BPASS and Cloudy models to create a supporting set of templates that match the predicted rest-UV colors of z > 8 the simulated galaxies in a mock catalog (Yung et al. 2022), which mimics expected field depths and areas of the Cosmic Evolution Early Release Science Survey (CEERS: m$_{5σ}$ ~ 28.6 over ~100 arcmin$^2$; Finkelstein et al. 2022a, Bagley et al. 2022). We use EAZY to highlight the improvements in redshift recovery with the inclusion of our new template set and suggest criteria for selecting galaxies at 8 < z < 10 with JWST, providing an important test case for observers venturing into this new era of astronomy.
