The 1 Ms Chandra Survey of the HDF - N : Populations at the Faintest X - ray Fluxes

The Chandra Deep Field-North survey, which has at its center the Hubble Deep Field-North, has reached an exposure of 1 Ms and is now available to the public for analysis. This great astronomical resource will soon be released to the community in the form of a catalog paper with accurate X-ray fluxes in four bands and astrometry good to ≈ 0.6 ′′ –1.2 ′′ over the entire ACIS-I field. The scientific focus of this contribution is the population of X-ray sources detected at X-ray fluxes below the faintest detection limits of X-ray observatories such as ROSAT and ASCA. These include fairly normal and star-forming galaxies out to z ≈ 2, starburst galaxies from z = 2–4 and possibly very high redshift (z > 6) AGN. The exciting new prospects for studying these populations in the X-ray band are discussed.