论文标题
关于针对宇宙黎明的光度星系调查的预期纯度
On the expected purity of photometric galaxy surveys targeting the Cosmic Dawn
论文作者
论文摘要
在过去的三十年中，使用Lyman-Break技术的光度星系选择改变了我们对高Z宇宙的理解，在3 <Z <8的情况下，大量的星系样本具有相对较小的污染。随着詹姆斯·韦伯（James Webb）太空望远镜的出现，莱曼突破技术现已扩展到Z〜17。但是，未测试的样品的纯度尚未进行测试。在这里，我们使用一个简单的模型，建立在暗物质光环质量功能的强大基础上，以表明污染的预期水平在z> 10处急剧上升，尤其是对于发光星系，对选择过程提出了严格的要求。 Z> 12的最具发光源可能比潜在的污染物至少罕见，因此可能需要进行广泛的光谱随访活动来识别少量目标来源。
Over the last three decades, photometric galaxy selection using the Lyman-break technique has transformed our understanding of the high-z Universe, providing large samples of galaxies at 3 < z < 8 with relatively small contamination. With the advent of the James Webb Space Telescope, the Lyman-break technique has now been extended to z ~ 17. However, the purity of the resulting samples has not been tested. Here we use a simple model, built on the robust foundation of the dark matter halo mass function, to show that the expected level of contamination rises dramatically at z > 10, especially for luminous galaxies, placing stringent requirements on the selection process. The most luminous sources at z > 12 are likely at least ten thousand times rarer than potential contaminants, so extensive spectroscopic followup campaigns may be required to identify a small number of target sources.
