Spectroscopic Survey of the Distant Universe

AST95-29098 PI：桑德拉·费伯对遥远宇宙的光谱调查目前对遥远星系的光谱调查正在探索I波长波段(在红外波段)的22等。然而，翻新后的哈勃太空望远镜提供的图像可以产生低至I=26的形态和光度，或暗40倍。这些非常暗的星系缺乏光谱，限制了从HST图像中获得的信息量。为了缩小这一差距，计划进行两次独立但平行的光谱调查，使用10米长的Keck I望远镜及其LRIS光谱仪。第一次调查包括深部(星系外深进化探测器)计划的第一阶段，将对大约600个远场星系进行调查；另一次调查将对9个星系团中约400个高红移星系进行调查。这些数据将与哈勃图像结合使用，以编目遥远宇宙在z~0.5和1.0之间的星系内容，并利用这种比较来表征宇宙生命的大约后半部分的星系演化的性质。在为期两年的专有期之后，将以电子方式提供在本提案支持下获取的所有数据的公共档案，包括光谱和成像数据。

AST 95-29098 PI: Sandra Faber Spectroscopic Surveys of the Distant Universe Current spectroscopic surveys of distant galaxies are now probing down to 22 magnitude in the I wavelength band (in the infrared). However, the refurbished Hubble Space Telescope is providing images yielding morphology and photometry down to I = 26, or 40 times fainter. Lack of spectra on these very faint galaxies limits the amount of information available from the HST images. To close the gap, two separate but parallel spectroscopic surveys are planned, using the 10-m Keck I telescope and its LRIS spectrograph. The first survey, comprising Phase I of the DEEP (Deep Extragalactic Evolutionary Probe) Project, will be of about 600 distant field galaxies; the other will be of about 400 high-redshift galaxies in nine clusters. The data will be used in concert with Hubble images to catalog the galactic content of the distant Universe between z ~ 0.5 and 1.0, and use this comparison to characterize the nature of galactic evolution over roughly the latter half of the lifetime of the Universe. A public archive of all the data taken under the aegis of this proposal, both spectroscopic and imaging, will be made available electronically after a two-year proprietary period.