NuSTAR Extragalactic Survey and Obscured AGN Program

The Nuclear Spectroscopic Telescope Array (NuSTAR) is providing unprecedented sentivity to the high energy extragalactic sky in the 5 - 80 keV band. The baseline 2-year mission includes a mixture of field surveys and targeted observations of known sources. In terms of field surveys, we plan a 3-tiered program, obtaining very deep 200 ks) observations of a portion of the Extended Chandra Deep Field-South (ECDFS), deep (25-50 ks) observations of 1-2 square degrees of COSMOS, and shallow 10 ks) observations of a sample of bright Swift/BAT AGN. These data will enhance our understanding of the sources contributing to the X-ray background at its 30 keV peak. In particular, models predict a population of heavily-obscured AGN, undetected in the soft X-rays, that will be seen in the hard X-ray observations of NuSTAR. Our targeted extragalactic program includes several observations, studying targets ranging from local starburst galaxies to distant galaxy clusters. I will discuss and present early results from NuSTAR's targeted obscured AGN program, which includes observations of famous, nearby obscured AGN (e.g., NGC 1365), famous ULIRGs (e.g., Mrk 231), BALQSO's, and WISE-selected obscured AGN.