Optical Selection of Star-forming Galaxies at Redshifts 1 < z < 3
Optical Selection of Star-forming Galaxies at Redshifts 1 < z < 3
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DOI：
10.1086/383221
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发表时间：
2004-01
期刊：
影响因子：
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通讯作者：
K. Adelberger;C. Steidel;A. Shapley;M. Hunt;D. Erb;N. Reddy;M. Pettini
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文献类型：
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作者：
K. Adelberger;C. Steidel;A. Shapley;M. Hunt;D. Erb;N. Reddy;M. Pettini
在星等限制巡天探测到的红移范围z 1和莱曼间断巡天探测到的红移范围z 3之间，几乎没有发现星系。在较低和较高红移的星系样本的比较表明，大量的恒星诞生，哈勃序列开始形成在中间红移1 < z < 3，但观测的挑战阻止了我们观察这个过程的细节。我们提出了简单而有效的策略，可以用来找到大量的星系在这个重要的，但未探索的红移范围。所有的策略都是基于通过少量的光学滤波器拍摄的地面图像中的颜色来选择星系进行光谱学分析：红移为0.85 < z < 1.15的G i，红移为1 < z < 1.5的G z，以及红移为1.4 < z < 2.1和1.9 < z < 2.7的UnG。我们的策略的性能是量化的经验，通过光谱的2000多个星系在1 < z < 3.5。我们估计，在1 < z < 3的紫外线光度密度中，有一半以上是由满足我们颜色选择标准的星系产生的。我们的方法进行了详细描述，让读者制定类似的选择标准，其他光学滤波器系统。
Few galaxies have been found between the redshift ranges z ≲ 1 probed by magnitude-limited surveys and z ≳ 3 probed by Lyman break surveys. Comparison of galaxy samples at lower and higher redshift suggests that large numbers of stars were born and the Hubble sequence began to take shape at the intermediate redshifts 1 < z < 3, but observational challenges have prevented us from observing the process in much detail. We present simple and efficient strategies that can be used to find large numbers of galaxies throughout this important but unexplored redshift range. All the strategies are based on selecting galaxies for spectroscopy on the basis of their colors in ground-based images taken through a small number of optical filters: Gℛi for redshifts 0.85 < z < 1.15, Gℛz for 1 < z < 1.5, and UnGℛ for 1.4 < z < 2.1 and 1.9 < z < 2.7. The performance of our strategies is quantified empirically through spectroscopy of more than 2000 galaxies at 1 < z < 3.5. We estimate that more than half of the UV luminosity density at 1 < z < 3 is produced by galaxies that satisfy our color selection criteria. Our methodology is described in detail, allowing readers to devise analogous selection criteria for other optical filter systems.