title: The Chandra Deep Field-North Survey and the cosmic X-ray background.
abstract: Chandra has performed a 1.4 Ms survey centred on the Hubble Deep Field-North (HDF-N), probing the X-ray Universe 55-550 times deeper than was possible with pre-Chandra missions. We describe the detected point and extended X-ray sources and discuss their overall multi-wavelength (optical, infrared, submillimetre and radio) properties. Special attention is paid to the HDF-N X-ray sources, luminous infrared starburst galaxies, optically faint X-ray sources and high-to-extreme redshift active galactic nuclei. We also describe how stacking analyses have been used to probe the average X-ray-emission properties of normal and starburst galaxies at cosmologically interesting distances. Finally, we discuss plans to extend the survey and argue that a 5-10 Ms Chandra survey would lay key groundwork for future missions such as XEUS and Generation-X.
authors.affiliation: Department of Astronomy and Astrophysics, 525 Davey Laboratory, The Pennsylvania State University, University Park, PA 16802, USA.
authors.forename: W Nielsen
authors.initials: WN
authors.lastname: Brandt
authors.forename: David M
authors.initials: DM
authors.lastname: Alexander
authors.forename: Franz E
authors.initials: FE
authors.lastname: Bauer
authors.forename: Ann E
authors.initials: AE
authors.lastname: Hornschemeier