SPECTROSCOPIC CONFIRMATION OF FAINT LYMAN BREAK GALAXIES NEAR REDSHIFT FIVE IN THE HUBBLE ULTRA DEEP FIELD
SPECTROSCOPIC CONFIRMATION OF FAINT LYMAN BREAK GALAXIES NEAR REDSHIFT FIVE IN THE HUBBLE ULTRA DEEP FIELD
复制标题
哈勃超深场红移五附近暗淡莱曼断裂星系的光谱确认
DOI：
10.1088/0004-637x/697/1/942
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Haojing Yan
中科院分区：
文献类型：
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作者：
J. Rhoads;S. Malhotra;N. Pirzkal;M. Dickinson;S. Cohen;N. Grogin;N. Hathi;Chun Xu;I. Ferreras;C. Gronwall;A. Koekemoer;M. Kümmel;G. Meurer;N. Panagia;A. Pasquali;R. Ryan;A. Straughn;J. Walsh;R. Windhorst;Haojing Yan
我们提出了迄今为止最微弱的光谱证实的 z ∼ 5 莱曼断裂星系 (LBG) 样本。该样本基于来自 Grism ACS 河外科学计划 (GRAPES) 和探测演化和再电离光谱 (PEARS) 项目的哈勃超深场区域的无缝棱镜光谱，使用哈勃太空望远镜高级巡天相机上的 G800L 棱镜。我们在此报告了 39 个星系的确认，这些星系是使用光度选择标准预选为候选 LBG 的。我们将基于 Giavalisco 等人的工作的“传统”V-dropout 选择与更自由的选择（V − i > 0.9）进行比较，发现传统标准的完整性约为 64%，可靠性为 81%。我们还研究了样品的 Lyα 发射特性。我们发现约 1/4 的样品中检测到了 Lyα 发射，并且自由 V-dropout 颜色选择包括约 55% 的先前发布的线选择 Lyα 源。最后，我们检查堆叠的二维光谱。我们证明，强烈的、空间扩展的（~1”）Lyα发射并不是这些LBG的通用属性，但Lyα光球层的适度扩展（与星光相比）可能存在于那些具有突出Lyα发射的星系中。
We present the faintest spectroscopically confirmed sample of z ∼ 5 Lyman break galaxies (LBGs) to date. The sample is based on slitless grism spectra of the Hubble Ultra Deep Field region from the Grism ACS Program for Extragalactic Science (GRAPES) and Probing Evolution and Reionization Spectroscopically (PEARS) projects, using the G800L grism on the Hubble Space Telescope Advanced Camera for Surveys. We report here confirmations of 39 galaxies, preselected as candidate LBGs using photometric selection criteria. We compare a “traditional” V-dropout selection, based on the work of Giavalisco et al., to a more liberal one (with V − i > 0.9), and find that the traditional criteria are about 64% complete and 81% reliable. We also study the Lyα emission properties of our sample. We find that Lyα emission is detected in ∼1/4 of the sample, and that the liberal V-dropout color selection includes ∼55% of previously published line-selected Lyα sources. Finally, we examine our stacked two-dimensional spectra. We demonstrate that strong, spatially extended (∼1″) Lyα emission is not a generic property of these LBGs, but that a modest extension of the Lyα photosphere (compared to the starlight) may be present in those galaxies with prominent Lyα emission.