CAREER: Multiwavelength Studies of the Star Formation and Accretion Histories of the Universe

这个项目旨在识别和研究构成河外x射线背景光的来源。利用钱德拉x射线天文台的图像，首次可以对软硬x射线源进行几乎完整的普查，后续的观测将从地面进行无线电、亚毫米、红外和光学波长的观测。对宿主星系中超大质量黑洞的研究应该有助于解决关于宇宙热历史的一个最重要的问题，即星系间介质是由吸积黑洞还是恒星再电离的。深深数据与广域数据的结合将确定活动星系核的光度函数，从而重建宇宙的黑洞吸积历史。在这个非常特殊的观测宇宙学时代，将会有重大的发现，这些发现将通过各种各样的项目呈现给公众和教育工作者

AST-0239425BargerThis project intends to identify and study the sources that comprise the X-ray extragalactic background light. For the first time, a nearly complete census of soft and hard X-ray sources can now be made using images from the Chandra X-ray Observatory, and follow-up observations will be made from the ground at radio, submillimeter, infrared and optical wavelengths. Study of the supermassive black holes in the host galaxies should help to resolve one of the most important questions about the thermal history of the Universe, namely, whether the intergalactic medium was reionized by accreting black holes or by stars. The combination of very deep with wide area data will determine the luminosity function for active galactic nuclei and thus reconstruct the black hole accretion history of the Universe.The significant discoveries that will be made in this very special era of observational cosmology will be presented to the public and to educators through various programs.***