Hobby-Eberly望远镜暗能量实验（HETDEX）：描述和早期试点调查结果
The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX): Description and Early Pilot Survey Results
摘要：
Hobby-Eberly望远镜暗能量实验（HETDEX）将为10米的HET配备一个新的宽视场和一个由150个积分场光谱仪组成的阵列，以测量420平方米的空间。°的银河系北部的一个地区。每个光纤耦合单元摄谱仪将同时覆盖350-550 nm。这台名为VIRUS的仪器每次曝光将产生约34，000个光谱，并将首次向大型调查开放发射线宇宙。该调查将检测80万个Lyman-alpha发射（LAE）星系，1.9<z<3.5，以及超过100万个[OII]发射星系，z<0.5。在9立方Gpc体积的LAE星系的3-D地图将被用来测量膨胀的历史，在这个早期的时代使用重子声学振荡和功率谱的形状。HETDEX的目标是提供z~3处暗能量的直接探测。该测量将限制暗能量的演化，并将提供0.1%的宇宙曲率精度，比目前的精度高10倍。VIRUS单元摄谱仪（VIRUS-P）的原型本身就是一台功能强大的仪器。用于McDonald 2.7 m，它覆盖了所有积分场摄谱仪的最大面积，波长可达340 nm。VIRUS-P正在用于一项试点调查，以更好地测量LAE星系的属性，以支持HETDEX。我们报告这项调查的初步结果。
英文摘要：
The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) will outfit the 10 m HET with a new wide field and an array of 150 integral-field spectrographs to survey a 420 sq. deg. area in the north Galactic cap. Each fiber-coupled unit spectrograph will cover 350-550 nm, simultaneously. This instrument, called VIRUS, will produce ~34,000 spectra per exposure, and will open up the emission-line universe to large surveys for the first time. The survey will detect 0.8 million Lyman-alpha emitting (LAE) galaxies with 1.9<z<3.5 and more than a million [OII] emitting galaxies with z<0.5. The 3-D map of LAE galaxies in 9 cubic Gpc volume will be used to measure the expansion history at this early epoch using baryonic acoustic oscillations and the shape of the power spectrum. The aim of HETDEX is to provide a direct detection of dark energy at z~3. The measurement will constrain the evolution of dark energy and will also provide 0.1%-level accuracy on the curvature of the Universe, ten times better than current. The prototype of the VIRUS unit spectrograph (VIRUS-P) is a powerful instrument in its own right. Used on the McDonald 2.7 m, it covers the largest area of any integral field spectrograph, and reaches wavelengths down to 340 nm. VIRUS-P is being used for a pilot survey to better measure the properties of LAE galaxies in support of HETDEX. We report initial results from this survey.
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