Collaborative Research: The DEEP3 Survey - Three Fundamental Tests of Galaxy Evolution

这个团队将扩展他们的DEEP2光谱调查，使用Keck望远镜上的DEIMOS多目标光谱仪的高色散光谱，用于红移范围为0.5 z 1.5的星系。这个红移范围代表了85%的宇宙历史，在这段时间里，大多数星系的质量聚集在一起，星系形成了它们的圆盘。新的DEEP3调查集中在扩展的生长带上，这是美国宇航局许多大型天文台都观测过的天空区域。该团队将利用这些资料和其他档案编制一份全色目录，描述他们在从无线电到x射线的宽波长范围内调查的星系。DEEP3将把观测的极限推到比DEEP2暗淡2.5倍，测量的星系数量是DEEP2的三倍。该团队将通过测量它们在紫外线、红外线和无线电中的亮度，以及基于DEEP2和DEEP3调查中测量的光学发射线的诊断，来估计他们调查的星系形成恒星的速度。他们将研究在DEEP2中发现的星系中恒星形成速度与现有恒星质量之间的紧密关系，并研究星系环境和形态如何影响这种关系。团队成员将利用DEEP2和DEEP3的观测结果，研究盘状星系形成时，塔利-费舍尔关系（星系的光度与其自转速度之间的关系）等标度定律是如何随时间变化的。他们将研究活动星系核在恒星形成中的作用，并使用x射线观测来寻找微弱的隐藏活动核的迹象。研究生和博士后学者将在参与研究的过程中接受培训。就像DEEP2之前的调查一样，包括红移、光度测定和光谱在内的数据将被发布给天文学界。来自DEEP2的多波长图像，以及交互式红移目录，已经可以在b谷歌天空中使用；随着新调查的进行，更多的数据将被添加进来。

This team will extend their DEEP2 spectroscopic survey, using high dispersion spectra with the DEIMOS multi-object spectrograph at the Keck telescopes for galaxies in the redshift range 0.5 z 1.5. This redshift range represents 85% of cosmic history, over the time when most of the galaxy mass was assembled and galaxies formed their disks. The new DEEP3 survey concentrates on the extended Groth strip, an area on the sky that has been observed with many of NASA's great observatories. The team will use these and other archives to compile a panchromatic catalog describing their survey galaxies over a wide wavelength range from radio to X-rays. DEEP3 will push the limit of observations 2.5 times fainter than DEEP2, tripling the number of measured galaxies.The team will estimate the rate at which their survey galaxies are forming their stars, by measuring their brightness in the ultraviolet, infrared and radio, and by using diagnostics based on the optical emission lines measured in the DEEP2 and DEEP3 surveys. They will investigate a tight relation found in DEEP2 between the rate of star formation in a galaxy and the mass in stars already present, and examine how galaxy environment and morphology affect that relation. Team members will use observations from the DEEP2 and DEEP3 surveys to study how scaling laws such as the Tully-Fisher relation (between a galaxy's luminosity and its circular rotation speed) change over time as disk galaxies are assembled. They will investigate the role of active galactic nuclei in star formation, and use X-ray observations to search for signs of faint hidden active nuclei.Graduate students and postdoctoral scholars will be trained as they participate in the research. As has been done for the earlier DEEP2 survey, data including redshifts, photometry, and spectra would be released to the astronomical community. Multiwavelength images from DEEP2, along with an interactive redshift catalog, are already available on google sky; more data will be added as the new survey proceeds.