巨大Lya星云宽带巡天的成功I：巡天设计与候选天体选择
A Successful Broad-band Survey for Giant Lya Nebulae I: Survey Design and Candidate Selection
摘要：
巨大的Lya星云（或Lya“斑点”）可能是正在形成的大质量星系形成的地点，但这些强大的来源的稀有性使得很难形成它们的属性，电离机制和空间密度的连贯图像。系统的窄带Lya星云调查正在进行中，但所涵盖的小红移范围和观测费用限制了即使是最大的调查也可以探测的同动体积，并在寻找这种稀有来源时构成了一个重大问题。我们已经开发了一种系统的搜索技术，旨在寻找2<z<3深宽波段成像中的大型Lya星云，并对9.4平方度NOAO深宽视场巡天（NDWFS）Bootes场进行了巡天。这是迄今为止对Lya星云进行的体积最大的一次测量，测量的总体积约为10^8 h^-3_70 Mpc ^3。在本系列的第一篇论文中，我们介绍了调查设计的细节和系统选择的79个候选者的样本，其中包括一个以前发现的Lya星云。
英文摘要：
Giant Lya nebulae (or Lya "blobs") are likely sites of ongoing massive galaxy formation, but the rarity of these powerful sources has made it difficult to form a coherent picture of their properties, ionization mechanisms, and space density. Systematic narrow-band Lya nebula surveys are ongoing, but the small redshift range covered and the observational expense limit the comoving volume that can be probed by even the largest of these surveys and pose a significant problem when searching for such rare sources. We have developed a systematic search technique designed to find large Lya nebulae at 2<z<3 within deep broad-band imaging and have carried out a survey of the 9.4 square degree NOAO Deep Wide-Field Survey (NDWFS) Bootes field. With a total survey comoving volume of ~10^8 h^-3_70 Mpc^3, this is the largest volume survey for Lya nebulae ever undertaken. In this first paper in the series, we present the details of the survey design and a systematically-selected sample of 79 candidates, which includes one previously discovered Lya nebula.
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