z ~ 3Ly-alpha发射和Ly-alpha吸收半导体的宽带成像分离
Broadband Imaging Segregation of z ~ 3 Ly-alpha Emitting and Ly-alpha Absorbing Galaxies
摘要：
Lyman break星系（LBG）的光谱特性提供了一种手段，单独使用宽带信息来分离纯样品，其显示在吸收中占主导地位的Ly-alpha或在发射中占主导地位的Ly-alpha。我们提出的标准，开发使用一个大的z ~ 3 LBG光谱样品从文献中，使大量的每种光谱类型被收集在光度数据，提供良好的统计多个应用程序。此外，我们还发现z ~ 3 LBG粒子群的截短的微弱的蓝端尾与预期的Ly-alpha发射体（LAE）粒子群重叠，并直接导致LAE粒子群。因此，我们提出了简单的标准，干净地选择大量的z ~ 3 LAEs在深宽带调查。我们给出了在加拿大-法国-夏威夷望远镜遗产巡天中预选的32个z ~ 3处r' <~ 25.5 LBG和r' <~ 27.0 LAEs的光谱结果，证实了这些标准。
英文摘要：
The spectral properties of Lyman break galaxies (LBGs) offer a means to isolate pure samples displaying either dominant Ly-alpha in absorption or Ly-alpha in emission using broadband information alone. We present criteria developed using a large z ~ 3 LBG spectroscopic sample from the literature that enables large numbers of each spectral type to be gathered in photometric data, providing good statistics for multiple applications. In addition, we find that the truncated faint, blue-end tail of z ~ 3 LBG population overlaps and leads directly into an expected Ly-alpha emitter (LAE) population. As a result, we present simple criteria to cleanly select large numbers of z ~ 3 LAEs in deep broadband surveys. We present the spectroscopic results of 32 r' <~ 25.5 LBGs and r' <~ 27.0 LAEs at z ~ 3 pre-selected in the Canada-France-Hawaii Telescope Legacy Survey that confirm these criteria.
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